Height Of First Pod Research Articles

Exploring the Possibility of Chickpea (Cicer arietinum L.) Growing as Second Crop under Uşak Ecology

Tends on human nutrition change every day but legumes act significant role for nutrition over the World. Chickpea (Cicer arietinum L.) is a member of Leguminosae family and originated from Asia. Chickpea is rich with protein, carbohydrate, lipid and minerals. It is also sufficient for Daily requirement by view of the essential amino acids – lysine, leucine and arginine. Chickpea is also source of soluble and insoluble fibers. The nutritional fibers have favorable effects on decreasing the time of food passing through intestine, accelerating of weight loss, decreasing of total and LDL cholesterol and balancing of blood sugar level. Sustainability of agriculture is essential for sustainability of life. From this perspective, chickpea is quite important due to various agronomic advantages that may be summarized by main ones are; able to grow as winter crop, lower water requirement, wide adaptation ability to climate and soil, a good alternative for crop rotation systems in addition to health care features. Present research is realized to evaluation of second crop growing facilities in Uşak/Turkey ecology by using 4 chickpea genotypes (Azkan, Hisar, Sarı-98, Yaşa-05) by 4 sowing time (18th June, 02nd July, 16th July, 30th July) by 3 replications. The following measurements were realized; days to emergence, days to flowering, days to harvest, height of plant, number of pod per plant, number of seed per pod, height of first pod, seed yield and weight of hundred seeds. According to the results Yaşa-05 chickpea genotype was determined as the most adaptable in addition to the Azkan chickpea genotype was also obtained as promising to growing as second crop. Deep and long term studies are needed to achievement of more consistent results and providing to sustainability of food security, improvement of soil, better usage of natural sources and contribute to national economy.

Performance of soybean crop in response to palisadegrass pasture desiccation and nitrogen fertilization under integrated crop-livestock system

The desiccation (burn down) time of high-biomass pasture in no-tillage system and nitrogen (N) fertilization of pasture and soybean can influence the crop performance under crop-livestock system. The objective of this study was to evaluate the effect of desiccation times of palisadegrass pasture combined with three N fertilization levels of pasture and two N fertilization levels of soybean on crop yield, yield components and grain oil and protein concentration. Three N rates in the U. brizantha cv. BRS Piatã pasture were evaluated (0; 150 and 300 kg ha-1 of N as urea) in three different experiments. In each experiment, five pasture desiccation periods (60; 45; 30; 15 and 1 days before soybean sowing) and two levels of N fertilization of soybean (30 kg ha-1 of N distributed as urea at sowing + a control without urea) were evaluated. A randomized complete block design with five replications was used for each experiment. After statistical analysis of each experiment, a joint analysis of the three experiments was performed, allowing the comparison of the three rates of N in the pasture. The time interval between Urochloa brizantha pasture desiccation and soybean sowing did not influence soybean yield, yield components or the grain oil and protein concentrations, regardless of N fertilization of pasture and soybean. N fertilization of pasture induced a taller soybean plant height, insertion height of first pod, increased lodging, and reduced yield, but did not change the grain oil and protein concentration, regardless of the pasture desiccation time and N fertilization of soybean. Soybean grain yield was negatively affected by N fertilization of the crop, regardless of fertilization levels and desiccation times of the previous pasture

High-throughput phenotyping allows the selection of soybean genotypes for earliness and high grain yield

BackgroundPrecision agriculture techniques are widely used to optimize fertilizer and soil applications. Furthermore, these techniques could also be combined with new statistical tools to assist in phenotyping in breeding programs. In this study, the research hypothesis was that soybean cultivars show phenotypic differences concerning wavelength and vegetation index measurements.ResultsIn this research, we associate variables obtained via high-throughput phenotyping with the grain yield and cycle of soybean genotypes. The experiment was carried out during the 2018/2019 and 2019/2020 crop seasons, under a randomized block design with four replications. The evaluated soybean genotypes included 7067, 7110, 7739, 8372, Bonus, Desafio, Maracai, Foco, Pop, and Soyouro. The phenotypic traits evaluated were: first pod height (FPH), plant height (PH), number of branches (NB), stem diameter (SD), days to maturity (DM), and grain yield (YIE). The spectral variables evaluated were wavelengths and vegetation indices (NDVI, SAVI, GNDVI, NDRE, SCCCI, EVI, and MSAVI). The genotypes Maracai and Foco showed the highest grain yields throughout the crop seasons, in addition to belonging to the groups with the highest means for all VIs. YIE was positively correlated with the NDVI and certain wavelengths (735 and 790 nm), indicating that genotypes with higher values for these spectral variables are more productive. By path analyses, GNDVI and NDRE had the highest direct effects on the dependent variable DM, while NDVI had a higher direct effect on YIE.ConclusionsOur findings revealed that early and productive genotypes can be selected based on vegetation indices and wavelengths. Soybean genotypes with a high grain yield have higher means for NDVI and certain wavelengths (735 and 790 nm). Early genotypes have higher means for NDRE and GNDVI. These results reinforce the importance of high-throughput phenotyping as an essential tool in soybean breeding programs.

Investigation of morphological traits, yield and yield components of mung bean under nitrogen and megafol fertilizer

Abstract Background and objectives Pulses with more than 20% protein, have an important role in providing the protein needed by humans especially in countries where livestock production and agricultural products are low. These products can be used in human nutrition as a valuable and suitable dietary supplement in combination with cereals (Majnoun Hoseini, 2015). In Golestan province, due to the positive role of mung bean in rotation, it should have a special place. Farmers of Golestan province should cultivate this useful, valuable, high-yielding, early maturing, uniform in maturity and suitable conditions for mechanized harvesting after grains such as wheat due to the low water needs of this plant in summer and proper crop rotation. Materials and methods In order to study traits of morphologic, yield and yield components of mung bean (Vigna radiata L.) under nitrogen and megafol fertilizer, a factorial experiment was conducted based on RCBD in three replications on research farm of Gonbad Kavous University in 2017. Nitrogen fertilizer was in four levels of 0, 50, 100 1nd 150 kg.h-1 and megafol fertilizer in three levels of 0, 1 liter and two liters.ha-1. Row spacing was 50 cm and plant on row 25 cm. In this experiment plant length, height of first pod from the ground, number of branch per plant, height of first branch from the ground, number of pod per plant, number of seed per pod, number of seed per plant, 1000-seed weight, plant yield and seed yield was determined. Results Results showed that effect of nitrogen on plant length and height of first pod from the ground at 5% level probability and on height of first branch from the ground, number of branch per plant, number of pod per plant, number of seed per pod, number of seed per plant, 1000-seed weight, plant yield and seed yield was significant at 1% level probability. Effect of megafol fertilizer on number of seed per pod and 1000-seed weight was significant at 5% level probability and on number of pod per plant, number of seed per plant, plant yield and seed yield was significant at 1% level probability. The maximum plant length (63.63cm), height of first branch from the ground (34.14 cm), height of first pod from the ground (8.95 cm), number of branch per plant (3.98), number of pod per plant (27.62), number of seed per pod (5.31), number of seed per plant (148.4), 1000-seed weight (43.84 gr), plant yield (6.51 gr) and seed yield (820.4 kg.h-1) was belonged to application of 150 kg.h-1 nitrogen. The minimum of traits was obtained from non application of nitrogen. Application of two liters.h-1 megafol produced the maximum number of pod per plant (26.48), number of seed per plant (141.2), 1000-seed weight (43.01gr), plant yield (6.2 gr) and seed yield (755.4 kg-1). Conclusion In addition, consumption of nitrogen and megafol created better conditions for growth and production of mung bean and so, the maximum of studied traits was obtained from high consumption of two fertilizers. The minimum of traits was obtained from non application of nitrogen and also non application of megafol.

Estimation of Genetic Parameters, Selection Indices and Association Analysis of Seed Yield and Its Component Traits in Chickpea (Cicer arietinum L.)

Background: Chickpea is a second most important pulse crop grown in 56 countries and India rank first in production which shares 61.4% of the total world chickpea production however, productivity is very low as compared to other countries. Therefore, varietal development with inherent tolerance to biotic and abiotic stress is the prime objective to improve component productivity traits to get better yield in rainfed agro-climatic conditions.Methods: Ninety germplasm accessions of chickpea along with four check viz., JG 14, JG 16, JAKI 9218 and Radhey were evaluated in augmented block design at experimental research farm of Banda University of Agriculture and Technology, Banda, Uttar Pradesh, India. Phenotypic data were subjected to study the genetic parameters and association analysis of yield and its component traits using SPAR 2.0 Package and Windostat Version 9.2.Result: The significant variation was observed for all the traits except number of secondary branches, number of pod per plant, number of seeds per pod among the genotypes. The maximum GCV and PCV was observed for height of first pod (35.28 and 39.29), followed by seed yield per plant (29.77 and 40.32) and number of primary branches (25.63 and 31.44). The high magnitude of heritability with genetic advance was estimated for seed index (96.61%), while the high genetic advance as per cent of mean was recorded for first pod height (65.27%). The positive and significant association of seed yield with number of pods per plant, seed index, number of seeds per pod, number of secondary branches, number of primary branches and height of first pod indicating the importance of these traits in selection criteria. Path analysis identified that number of seeds per pod, number of pods per plants, seed index and number of secondary branches per plant as highly desirable component for direct effect on seed yield per plant. The genotypes ICVT-181106 had highest selection indices for seed yield followed by ICVT-181107, PUSA-1053, JG-218, GNG-1999, ICVT-181102 and HC-5. Therefore, high GCV and PCV, significant positive direct and indirect correlation and high estimate of selection indices for grain yield can be directly and indirectly used for chickpea breeding program.

Response of early maturity soybean cultivars to row spacing in full-season crop and double-crop systems

Cultivar selection and crop systems are important factors for maximising soybean seed yield. The effect of row spacing (RS1 = 75 cm, RS2 = 25 cm) on the performance of 10 early maturity soybean cultivars grown in full-season and double-crop system for two consecutive years was studied. The agronomic traits measured were seed yield (SY), plant height (PH), pods per plant (PP), first pod height (FPH), crude protein. RS had a significant effect on SY, PH, PP and FPH. Higher SY (P < 0.01) was recorded in RS2 regardless of the crop system. The double-crop system yield reduction index of the tested cultivars ranged from 30.0% to 56.4% and from 21.5% to 57.2% for RS1 and RS2, respectively. Cultivars differed (P < 0.01) for all traits in both RS and crop systems. Maturity Group I cultivars showed the highest productivity; the cultivars PR92B63 and Atlantic were better adapted to the full-season crop system (SY > 5.67 t/ha); cv. Sphera was the most productive in the double-crop system (4.66 t/ha); cv. PR92M22 showed good adaptability to both cropping systems. In conclusion, the significant effect of RS and crop system on SY was observed, whereas different high yielding cultivars were identified as suitable for full-season and double-crop system.

Selection of soybean genotypes for yield, size, and oil and protein contents

A set of experiments was developed involving a randomized block design with three replications to evaluate 17 soybean genotypes for yield, size, and oil and protein contents. Soybean genotypes Conquista, CD 223 AP, Elite, Garantia, Bioagro, M-Soy 8400, M-soy 8001, Nambu, Sambaíba, Esplendor, UFVS 2006, UFVS 2005, UFVTN 102, UVF 18, UFV 16, Valiosa RR, and Vencedora were tested. The genotypes were compared and correlated with the following variables: plant height (PH), first pod height (FPH), yield, and oil and protein contents. The genotypes with the highest PH and FPH were Sambaíba, UFV 18, and Garantia, which, together with M-Soy 8001, also had the highest grain oil contents of 20.93, 21.16, 21.02, and 21.95, respectively. Genotype Bioagro had the highest grain protein content, and the genotypes Elite and Nambu were the most productive. Oil content had a negative correlation with protein content, and yield had a positive correlation with plant size in the evaluated soybean genotypes. Soybean (Glycine max (L.) Merrill) is one of the main oilseeds produced in the world, and is being used in the production of oils, cosmetics, and human and animal feed, making the plant highly important for the economic development of producing and consuming countries. In Brazil, soybean development has occurred effectively through genetic breeding programs, which have increased yield through the selection of genotypes adapted to the edaphoclimatic conditions of each region (Vasconcelos et al., 2015; Finoto et al., 2017)

Genetic parameters of soybean populations obtained from crosses between grain and food genotypes

In addition to the agronomic traits of interest, soybean cultivars destined for human consumption must have specific attributes that meet the demands of the consumer market. To meet this demand, this study aimed to select progenies with agronomic and commercial traits of interest from soybean populations obtained from crosses between different food and grain genotypes and to estimate the genetic parameters of these populations. The F3:4 and F4:5 progenies that originated from the two crosses were evaluated in the 2015/16 and 2016/17 agricultural years, respectively, using the pedigree method. The experimental design utilized augmented blocks, while statistical analyses were performed by using the REML/BLUP methodology. The evaluated traits were plant height at maturity (APM), insertion height of first pod (AIV), lodging (AC), agronomic value (VA), number of pods per plant (NV), number of days to maturity (NDM), number of branches (NR), number of nodes (NN), 100-seed weight (PCS), and grain yield per plant (PG). The best progenies were selected, and the following genetic parameters were estimated: genetic variance, phenotypic variance, heritability, and selective accuracy. The estimates of the genetic parameters indicate the presence of high genetic variance in these populations. Heritability was high for most of the traits, indicating good potential for the selection of superior genotypes.

Study of Initial Material of Vetch

The study was conducted in the experimental field of the Institute of Forage Crops – Pleven, Bulgaria for a three-year period. Ten vetch specimens (varieties and populations) different originated were examined – Bulgarian population (Vicia sativa); Bulgarian population (Vicia pannonica ssp. striata; Detenicka Panonska (Vicia pannonica) and Asko 1; Kowatschite, K- 25 331, K- 29 800, K- 30 553, K- 30 574, K- 30 671 from Vicia villosa. The main quantitative characteristics were analyzed: plant height (cm), height of the first pod (cm), number of pods per plant, number of seeds per plant, number of seeds per pod, weight of seeds per plant (g) and indicators: beginning of flowering stage (days) and duration of the growing season (days). Two-way ANOVA and variance analysis were used for statistical data processing. High values ​​of variation coefficient were found for seed weight (107.87%), number of seeds per plant (88.80%), height of first pod (30.78%), number of pods per plant (37.97%) and number of seeds per pod (27.45), and average variation for plant height (15.97%), respectively. The varieties of Vicia pannonica can be characterized as early ripening with a growing season duration of 244-246 days, the population of Vicia sativa as medium ripening (242-252 days), and from Vicia villosa (except K-29 800, Kowatschite and Asko 1) as late maturing (242-256 days). The varieties of the species Vicia villosa K-30 671, Asko and 1 K-25 331, which are well leafed and form long stems (142-151 cm), are suitable as parental components in the combinational selection in the direction for forage. The Bulgarian population of Vicia sativa was found to form the largest number of both, pods (87) and seeds (351). For other the numbers, the seeds per plant trait was between 116 (K-30 574) and 133 (K-30 553). In the direction of seed production the Bulgarian population of Vicia sativa can be emitted.

DERİN VEN TROMBOZU İLE PLAZMİNOJEN AKTİVATÖR İNHİBİTÖR-1 4G/5G GEN POLİMORFİZMİN

This study was carried out for the winter season of 2015-2016. In this study, it is aimed to determine suitable high yield red lentil genotypes in Mardin conditions. 20 winter genotypes and five control lentil varieties (Altıntoprak, Çağıl, Fırat-87, Seyrani-96 and Yerli Red) originating from ICARDA and in the Southeastern Anatolia region were used. Trial randomised block design were set up in 3 repetitions according to the trial pattern. All the features examined in the research were statistically significant. According to the results obtained; number of days of flowering 143.7-158.8 days, number of days of ripening 187.5-198.9 days, plant height 26.7-49.6 cm, height of first pod 13.4-34.1 cm, branch in plant 1.96-3.33 pieces / plant, number of pods in plant 14.7-29.0 count / pods, The number of grains in the plant varies between 16.9-33.5 / plant, plant grain yield between 0.29-0.75 g, 100 grain weight between 31.8-37.7 g and 1445-2164 kg / ha-1 in terms of grain yield. In the study, the highest grain yield was obtained from G2 (2111 kg /ha-1) and G5 (2070 kg /ha-1), while it was 2164 kg /ha-1 in Fırat-89 variety. In terms of grain yield, two genotypes (G2 and G5) were transferred to an advanced generation in our region

Correlations and path analysis in soybean progenies with resistance source to cyst nematode (race 3)

Path analysis is an important study that slices the correlation coefficients between two variables to evaluate whether the relationship between them is of cause and effect. This study aimed to estimate the phenotypic and genotypic correlations between agronomic traits and perform a path analysis in order to identify variables for indirect selection aiming at a higher grain yield. Fourteen soybean F6 lines from the soybean breeding program of FCAV–UNESP, Jaboticabal, São Paulo, Brazil, were analyzed. The experimental design was a randomized block design with three replications. The agronomic traits plant height at maturity (PHM), first pod height (FPH), lodging (Ld), agronomic value (AV), number of pods per plant (NP), number of seeds per plant (NS), and grain yield (GY) were evaluated. Overall, the genotypic correlations were higher than their corresponding phenotypic correlations. The genotypic correlations between grain yield and the traits agronomic value, number of pods per plant, and number of seeds per plant were positive, significant, and of high magnitude. Path analysis showed that the trait number of seeds per plant had the highest direct effect on grain yield, while the trait number of pods per plant had the highest indirect effect through the number of seeds per plant on grain yield

Changing Plant Architecture and Density can Increase Chickpea Productivity and Facilitate for Mechanical Harvesting

Tall and erect chickpea cultivar HC 5 (Haryana Chana 5) was primarily bred for inter-cropping with autumn planted sugarcane. Cultivar HC 5 is distinctly different in morphology from traditional bushy or semi-spreading chickpea cultivars and it is found suitable for machine harvesting. However, a general recommended planting density (30 cm × 10 cm) is being followed for cv. HC 5 as well. In this study, we hypothesized that high-density planting can improve crop productivity and also improve the plant architecture for mechanical harvesting. To test this hypothesis, four plant spacing treatments (30 cm × 10 cm, 30 cm × 7.5 cm, 22.5 cm × 10 cm, and 22.5 cm × 7.5 cm) were evaluated in two chickpea cultivars (HC 5 and JAKI 9218) for crop growth, grain yield and the desirable plant traits for mechanical harvesting. The highest grain yield of cv. HC 5 was observed with 22.5 cm × 10 cm spacing that increased the grain yield by 9% (p < 0.05) over plant spacing of 30 cm × 10 cm (conventional); this indicates that high-density planting could increase the productivity of the cv. HC 5. Where grain yield of cv. JAKI 9218 was reduced (p < 0.05) with the increase in planting density over 30 cm × 10 cm. Increased grain yield of cv. HC 5 with 22.5 cm × 10 cm spacing over 30 cm × 10 cm was mainly attributed to increase in plant density (33%); however, all the plant attributes (primary branch, secondary branch, pod plant−1) were reduced as compared to plant spacing of 30 cm × 10 cm. The decrease in intra-row spacing of cv. HC 5 resulted in a strong adverse effect on plant growth and yield parameters as compared to inter-row spacing and thus not recommended. High-density planting increased the plant height (erectness) and ground clearance of cv. HC 5 (height of first pod) (~ 30 cm), an essential prerequisite for mechanical harvesting, but not in cv. JAKI 9218. Hence, cv. HC 5 requires a dense planting for higher yield and appropriate plant structure for mechanical harvesting. Therefore, it is recommended to work out the optimum planting geometry/plant population to realize the potential yield of cultivars bred for mechanical harvesting.

Genetic Variability Induced by Gamma Rays and Preliminary Results of Low-Cost TILLING on M2 Generation of Chickpea (Cicer arietinum L.).

In order to increase genetic variability for chickpea improvement, the Kabuli genotype, variety Ghab4, was treated with 280 Grays of gamma rays (Cobalt 60). Field characterization began with the M2 generation. A total of 135 M2 families were sown in the field resulting in approximately 4,000 plants. Traits related to phenology (days to flowering, days to maturity), plant morphology of vegetative parts (plant height, height of first pod, number of primary branches per plant) and yield (number of seeds per pod, total number of pods per plant, total number of seeds per plant, seed yield and hundred seed weight) were recorded and analyzed to evaluate genetic variability. An evaluation of the efficacy of low-cost TILLING (Targeting Induced Local Lesions IN Genomes) to discover mutations in the M2 generation was undertaken. Mutation screening focused on genes involved in resistance to two important diseases of chickpea; Ascochyta blight (AB) and Fusarium wilt (FW), as well as genes responsible for early flowering. Analysis of variance showed a highly significant difference among mutant families for all studied traits. The higher estimates of genetic parameters (genotypic and phenotypic coefficient of variation, broad sense heritability and genetic advance) were recorded for number of seeds per plant and yield. Total yield was highly significant and positively correlated with number of pods and seeds per plant. Path analysis revealed that the total number of seeds per plant had the highest positive direct effect followed by hundred seed weight parameter. One cluster from nine exhibited the highest mean values for total number of pods and seeds per plant as well as yield per plant. According to Dunnett’s test, 37 M2 families superior to the control were determined for five agronomical traits. Pilot experiments with low-cost TILLING show that the seed stock used for mutagenesis is homogeneous and that small mutations do not predominate at the dosage used.

Identification of Major QTLs Associated With First Pod Height and Candidate Gene Mining in Soybean.

First pod height (FPH) is a quantitative trait in soybean [Glycine max (L.) Merr.] that affects mechanized harvesting. A compatible combination of the FPH and the mechanized harvester is required to ensure that the soybean is efficiently harvested. In this study, 147 recombinant inbred lines, which were derived from a cross between ‘Dongnong594’ and ‘Charleston’ over 8 years, were used to identify the major quantitative trait loci (QTLs) associated with FPH. Using a composite interval mapping method with WinQTLCart (version 2.5), 11 major QTLs were identified. They were distributed on five soybean chromosomes, and 90 pairs of QTLs showed significant epistatic associates with FPH. Of these, 3 were main QTL × main QTL interactions, and 12 were main QTL × non-main QTL interactions. A KEGG gene annotation of the 11 major QTL intervals revealed 8 candidate genes related to plant growth, appearing in the pathways K14486 (auxin response factor 9), K14498 (serine/threonine-protein kinase), and K13946 (transmembrane amino acid transporter family protein), and 7 candidate genes had high expression levels in the soybean stems. These results will aid in building a foundation for the fine mapping of the QTLs related to FPH and marker-assisted selection for breeding in soybean.

&lt;b&gt;Strategies to select soybean segregating populations with the goal of improving agronomic traits

The success of breeding programs depends on selection procedures and on the breeding methods adopted for selecting segregating populations. The objective of this study was to evaluate the efficiency of the Bulk method with selection in the F3 generation (BulkF3) compared to that of Bulk method as well as determine the most effective selection strategy in terms of genetic gain. Twenty segregating populations were selected by two methods. The 60 best families of each method were selected according to their average agronomic performance. An augmented block design was used. The following agronomic traits were evaluated: insertion height of first pod, plant height at maturity, number of branches and of pods per plant, 100-seed weight, and grain yield. For comparison of the methods, genetic component estimates, genetic gain and predicted breeding values were calculated using mixed models (REML and BLUP). The results showed the families obtained with the BulkF3 method were more productive, showed suitable plant height, a larger number of branches and pods, and higher 100-seed weight. The BulkF3 method was found to be an effective selection strategy for soybean improvement.

A study on determination of phenological characteristics, yield and yield components in different pea genotypes in Bayburt conditions.

This study was conducted to compare of ten pea genotypes (Pisum elatius L. (Collected from natural vegetation and early yielding), Utrillo, Bolero, Reyna, Nihal, Jof, Karina, Pisum elatius L. (Collected from natural vegetation), Senador, Pisum sativum L. (Collected from natural vegetation)) for phenological stages, yield and yield components in 2016 year. The study was carried out at Bayburt University, Aydintepe Vocational School Research Area with three replications, according to randomized complete block design. In the study, plant height, stem diameter, number of branches, height of first pod, length of pods, width of pod, number of pods per plant, seed number per pod 1000 seed weight and grain yields were investigated. According to the results gained from the study, the lowest grain yield value was obtained from Pisum elatius L. collected from natural vegetation with 61 kg/da, while the highest yield value was obtained from Reyna variety with 138 kg/da.

Shade adaptive response and yield analysis of different soybean genotypes in relay intercropping systems

Soybean is one of the major oil seed crops, which is usually intercropped with other crops to increase soybean production area and yield. However, soybean is highly sensitive to shading. It is unclear if soybean morphology responds to shading (i.e., shade tolerance or avoidance) and which features may be suitable as screening materials in relay strip intercropping. Therefore, in this study, various agronomic characteristics of different soybean genotypes were analyzed under relay intercropping conditions. The soybean materials used in this study exhibited genetic diversity, and the coefficient of variations of the agronomic parameters ranged from 13.84 to 72.08% during the shade period and from 6.44 to 52.49% during the maturity period. The ratios of shading to full irradiance in stem mass fraction (SMF) were almost greater than 1, whereas opposite results were found in the leaves. Compared with full irradiance, the average stem length (SL), leaf area ratio (LAR) and specific leaf area (SLA) for the two years (2013 and 2014) increased by 0.78, 0.47 and 0.65 under shady conditions, respectively. However, the stem diameter (SD), total biomass (TB), leaf area (LA), number of nodes (NN) on the main stem, and number of branches (BN) all decreased. During the shady period, the SL and SMF exhibited a significant negative correlation with yield, and the SD exhibited a significant positive correlation with yield. The correlation between the soybean yield and agronomic parameters during the mature period, except for SL, the first pod height (FPH), 100-seed weight (100-SW), and reproductive growth period (RGP), were significant (P<0.01), especially for seed weight per branch (SWB), pods per plant (PP), BN, and vegetative growth period (VGP). These results provide an insight into screening the shade tolerance of soybean varieties and can be useful in targeted breeding programs of relay intercropped soybeans.

Genetic and Environmental Variation of First Pod Height in Soybean [Glycine max (L.) Merr.

Beom-Kyu Kang, Hyun-Tae Kim, Man-Soo Choi, Seong-Chul Koo, Jeong-Hyun Seo, Hong-Sik Kim, Sang-Ouk Shin, Hong-Tae Yun, In-Seok Oh, Krishnanand P. Kulkarni, and Jeong-Dong Lee. Plant Breeding and Biotechnology 2017;5:36-44. https://doi.org/10.9787/PBB.2017.5.1.36

Canonical correlations between agronomic traits and seed physiological quality in segregating soybean populations.

The objective of this study was to evaluate the relationship between agronomic traits and physiological traits of seeds in segregating soybean populations by canonical correlation analysis. Seven populations and two commercial cultivars in three generations were used: F3 plants and F4 seeds; F4 plants and F5 seeds, and F4 seeds and plants. The following agronomic traits (group I) were evaluated: number of days to maturity, plant height at maturity, insertion height of first pod, number of pods, grain yield, and oil content. The physiological quality of seeds (group II) was evaluated using germination, accelerated aging, emergence, and emergence rate index tests. The results showed that agronomic traits and physiological traits of seeds are not independent. Intergroup associations were established by the first canonical pair for the generation of F3 plants and F4 seeds, especially between more productive plants with a larger pod number and high oil content and seeds with a high germination percentage and emergence rate. For the generation of F4 plants and F5 seeds, the first canonical pair indicated an association between reduced maturity cycle, seeds with a high emergence percentage and a high percentage of normal seedlings after accelerated aging. According to the second canonical pair, more productive and taller plants were associated with seed vigor. For the generation of F4 seeds and plants, the associations established by the first canonical pair occurred between seed vigor and more productive plants with high oil content and reduced maturity cycle, and those established by the second canonical pair between seeds of high physiological quality and tall plants.

Genotypic variation of agronomic traits as well as concentrations of Fe, Zn, P and phytate in soybean cultivars

ABSTRACT The staple diet of most of the world population is provided by cereal, which present levels of iron (Fe) and zinc (Zn) below the nutritional demand of humans. Other factors that may substantially interfere for the low intake of Fe and Zn are the anti- nutritional factors present in the edible parts of plants, such as heavy metals and phytate. Hence, the objective of this study was to evaluate the genotypic variation in terms of yield (kg ha-1), plant height, insertion height of first pod, as well as concentrations of Fe, Zn, phosphorus (P) and the anti-nutrient phytate in grains of 24 soybean cultivars and to identify cultivars with potential for biofortification. The field experiment was conducted in Rio Verde, state of Goiás by the technological center of COMIGO. The experimental design used in the study was a randomized block design with 24 treatments and three replications. The results showed that there is genotypic variation for grain yield (kg ha-1), plant height, and insertion height of first pod, as well as for the concentrations of Zn, Fe, P and concentration of anti-nutient phytate in grains among the soybean cultivars. Non-significant or low correlations were found among the evaluated parameters except for the relationship between P and phytate (r=0.733). The diversity found among soybean cultivars offers genotypes such as 8197RR, M 7908RR and BRS 262 with potential to develop cultivars with better ability to accumulate nutrients in grains.