Rootstock Diameter Research Articles

Phenological, Morphological and Pomological Characteristics of ‘Samsun Güzeli’ Pear Genotype on BA29 Rootstock

Türkiye has many local pear cultivars; some of them do not have much production and propagation potential due to their low quality and undesirable vegetative and generative characteristics. However, those that are superior in terms of fruit quality and yield characteristics have found a place for themselves in both local and national markets. In this respect, the ‘Samsun Güzeli’ genotype, which is an important local cultivar, is an ideal cultivar with many features and has a high potential to spread its cultivation all over Türkiye and other countries. ‘Samsun Güzeli’ is an autumn genotype, can easily meet the high demand in local and international markets due to its attractive color, smooth fruit shape and high quality. Despite all these valuable features, this cultivar is still not well known in Türkiye. There is a great need to disseminate cultivation and research on this subject. This study mainly aimed to reveal the phenological, morphological and pomological characteristics of the ‘Samsun Güzeli’ local pear genotype grafted on BA29, a commercially traded rootstock in 2021-2022. The results showed that the ‘Samsun Güzeli’ pear genotype completed its phenological cycle in 255 days in 2021 and 228 days in 2022 in Samsun climatic conditions. Fruit set rate of the genotype was 12.05% and the average yield was 17306.23 kg ha-1. It was also determined that the morphological characteristics averages were as the following; rootstock diameter 76.71 mm, trunk diameter 61.97 mm, trunk cross-sectional area 34.06 cm2, tree height 253.12 cm, canopy volume 0.96 m3, annual shoot length 37.19 cm and leaf area 11.74 cm2. Averages values of pomological and chemical properties recorded as the following; fruit weight 114.60 g, fruit volume 109.90 ml, soluble solid content (SSC) 13.16%, acidity 0.33%, and pH 4.37. In the sensory evaluations, the highest scores were obtained by juiciness (6.32) in the year 2022 while scores of overall visual quality were lowest in both years. In conclusion, it can be said that the ‘Samsun Güzeli’ genotype performs adequately in terms of fruit yield and quality on the standard dwarf rootstock and conducting new studies might be beneficial to disseminate the genotype.

Growth and compatibility traits of different citrus rootstocks under mid-hill condition

A study was carried out during 2022–23 at ICAR-Research Complex for North-Eastern Hills Region, Umiam, Meghalaya to find out the performance of Khasi mandarin (Citrus reticulata Blanco) on different rootstocks. The experiment was laid out in a randomized block design (RBD) with 10 treatments, viz. T1, Karna khata; T2, Trifoliate orange; T3, Rough lemon; T4, Rangpur lime; T5, Khasi papeda; T6, Taiwanica; T7, Volkameriana; T8, Tanzelodancy; T9, Pummelo; and T10, Cleopatra mandarin with 5 replications. With regards to grafting success, Rough lemon had the highest percentage, which was at par with Rangpur lime and Volkameriana, whereas Trifoliate orange had the lowest success rate. Maximum plant height, rootstock and scion diameter were noted in the rootstock of Rough lemon whereas highest number of leaves (17.33) and branches/plant (3.23) were recorded in Trifoliate orange. Through correlation analysis it was found that plant height was highly significantly correlated with rootstock diameter (r2 = 0.747, P<0.05) and vice versa. Number of leaves/plant had high correlations with number of branches/plant (r2 = 0.923, P<0.01) and scion diameter (r2 = 0.865, P<0.01). Also, a significant correlation was found between scion diameter and number of branches/plant (r2 = 0.801, P<0.01).

Morphological Evaluation of Pear cvs. Santa Maria, Williams, and Deveci Grafted onto Clonal and Seedling Rootstocks

This research was conducted to determine the effects of quince clonal rootstocks [Quince BA29 (BA29) and Quince A (QA)], pear clonal rootstocks [FOX9, FOX11, OHxF333, OHxF87 and FAROLD40] and European pear seedling rootstocks on the morphological characteristics of 'Santa Maria', 'Williams', and 'Deveci' pear cultivars in Bafra (Samsun) ecological conditions in the research years of 2021 and 2022. Morphological characteristics, such as rootstock diameter (mm), trunk diameter (mm), trunk cross-sectional area (cm2), tree height (cm), crown dimensions (width, length, height and volume), leaf stalk length (cm), leaf stalk thickness (mm), leaf dimensions (width, length, area), annual shoot length (cm), node numbers and internode length (cm) were examined in the study. Results of the study revealed significant variation in the case of research years on most morphological attributes; generally, the values were higher in the research year 2022 than in 2021. It has been determined that the effect of rootstocks on all the morphological characteristics was significant except for leaf stalk thickness. The highest morphological values were obtained from OHxF333, FOX11, and FAROLD40 compared to the other rootstocks, and the lowest values were recorded in FOX9, OHxF87, and seedling rootstocks, respectively. Considering the cultivars' effect on the evaluated morphological traits, the highest leaf characteristics, and internode length in the annual shoots were acquired from the 'Santa Maria' cultivar, but all other attributes were higher in the 'Deveci' cultivar. The ' Williams ' cultivar recorded almost all the lowest morphological values. The highest trunk cross-sectional area was determined in the 'Deveci'/OHxF333 (38.63 cm2) and the lowest in the 'Williams'/FOX9 (4.95 cm2). The longest annual shoots were determined in the 'Deveci'/FOX11 (43.05 cm) and the shortest in the 'Williams'/Seedling (16.11 cm). The highest leaf area was observed from the 'Santa Maria'/BA29 (21.11 cm2) and 'Santa Maria'/FOX11 (20.95 cm2) combinations. According to the results of the research, it was determined that OHxF333 rootstock among the evaluated rootstocks performed morphologically better than the others. FOX9 and OHxF87 pear clone rootstocks showed very poor performance compared to other rootstocks.

Softwood Grafting of Clementine Mandarin as Affected by Thidiazuron Treatment and Rootstock Type

Background: Citrus are propagated on a commercial scale by budding on different rootstocks species; nevertheless, one of the main problems nurserymen encounter is the slow growth of these rootstocks in the early phases of their growth, which drives up production costs. Therefore, the process of softwood grafting is one of the promising methods for quick propagating species of citrus. Methods: The present study on softwood grafting in clementine mandarin was conducted under lath house conditions during 2022-2023, to illustrate the impact of dipping the scion shoots in Thidiazuron at a concentration of 0, 10 and 20 mg L-1 and types of rootstocks (Sour orange, Rough lemon, Rangpur lime and Swingle citrumelo) on the percentage of grafting success and some vegetative characteristics of resultant saplings. A factorial experiment was executed out utilizing a randomized complete block design (RCBD) with three replications. Result: The two factors of study, particularly the treatment with 20 mg L-1 of Thidiazuron and Rough lemon rootstock, showed significant superiority in all traits, such as earliness in the initiation and completion of sprouting, graft success per cent, graft survival per cent, plant height, scion and rootstock diameter, as well as the number of branches and leaves plant-1. On the other hand, the un-treated with growth regulator and Swingle citrumelo rootstock recorded the lowest values for these traits.

The overall effect of research years, rootstocks, and cultivars on the morphological attributes of pear trees

This research was conducted to determine the combined effect of 3 factors including rootstocks, cultivars, and research years on the morphological characteristics in Samsun/Türkiye ecological conditions in the research years of 2021 and 2022. Eight rootstocks consisting of quince BA29 (BA29), quince A (QA), FOX9, FOX11, OHxF333, OHxF87, FAROLD40, and European pear seedlings were used in the study, while the cultivars were 'Santa Maria', 'Williams', and 'Deveci'. The study results revealed the significance of the combined factors on all leaf characteristics of European pear. While rootstock diameter, scion diameter, tree length, and trunk cross-sectional area showed insignificant variations. It was determined that the canopy characteristics of ‘Williams' pear cultivar in combination with the FAROLD40 and OHxF333 in the research year 2022 were higher than other combinations, while the same combination was obtained with lower values in the case of other morphological characteristics. Generally, all the morphological attributes were obtained higher in the rootstocks and cultivars combination in the research year of 2022. In conclusion, the genetic capacity of rootstocks, cultivars, and variations of the climate situations in two consequent research years, resulted in variations in the morphological attributes of pear trees.

Growth performance of cleft grafted velvet apple (Diospyros discolor Willd.)

Velvet apple is usually propagated through seeds but seeded plants do not maintain its true-to-type quality. The present work was undertaken to study the fate of cleft grafting of five selected velvet apple genotypes during 2018 - 2019 at the Germplasm Center, Patuakhali Science and Technology University. The pot experiment was conducted in RCBD with two factors as scions and Days after Grafting (DAG) consisting of 10 replications of the scions. Scions from five promising mother plants were considered as treatments (Dumki-Dd-S1, Dumki-Dd-S2, Dumki-Dd-S3, Dumki-Dd-S4 and Mirzaganj-Dd-S5) and were cleft grafted on seedling rootstock of Dumki-Dd-R1. At 84 DAG, significant differences were observed among the scion treatments regarding the studied growth parameters. The days required to bud break varied significantly which ranged from 14 days (Dumki-Dd-S4) to 18 days (Mirzagonj-Dd-S5). The maximum length (54.30 cm) and diameter (2.00 cm) of rootstock were recorded in Mirzagonj-Dd-S5 at 84 DAG. However, maximum scion length (22.20 cm) and scion diameter (0.70 cm) were noted in Dumki-Dd-S1at 84DAG. The highest graft heights of Dumki-Dd-S2 (71.20 cm) and Mirzaganj-Dd-S5(71.50 cm) were statistically similar at84 DAG. Graft success was highest in Mirzagonj-Dd-S5(60.00%) followed by Dumki-Dd-S4 (40.00%) at 84 DAG. The maximum number of sprouted shoots (2.10) was counted in Dumki-Dd-S1, however, the highest length and diameter of sprouted shoot (7.1 cm and 0.66 cm, respectively) and maximum number of leaf (7.40 per graft) were found in Mirzaganj-Dd-S5during the study period. It could be concluded that, Mirzaganj-Dd-S5 and Dumki-Dd-R1showed the best stionic relationship for multiplication of velvet apple by cleft grafting. South Asian J. Agric., Vol. 9, No.1&2, 2022-‘23: 1-10

Multiplication performance of monkey jack by cleft grafting on single source seedling rootstock

The present research work was undertaken to study the fate of cleft grafting of five potential monkey jack genotypes during 2020-2021 at the Germplasm Center, Patuakhali Science and Technology University, Bangladesh. Scions from five in situ conserved promising mother plants named as Dumki-Al-S1, Dumki-Al-S2, Dumki-Al-S3, Dumki-Al-S4 and Kalapara-Al-S5 were cleft grafted on seedling rootstock (Dumki-Al-R1) of single genotype. A pot experiment was set in two-factor (Scions and Days after grafting) RCBD with 10 replications. The time required to break bud varied significantly among the treatments and ranged from 14 to 20 days. Dumki-Al-S1 required the maximum time to bud break (20 days) followed by Dumki-Al-S3 (18 days). Dumki-Al-S2 took minimum time (14 days) for bud breaking. The maximum increased length of rootstock found in Dumki-Al-S2 which were 55.00, 55.70, 56.44 and 65.30 cm at 21, 42, 63 and 84 days after grafting (DAG), respectively, followed by Kalapara-Al-S5 (61.80, 54.80, 55.30, and 57.12 cm at 21, 42, 63 and 84 DAG, respectively). Kalapara-Al-S5 showed maximum diameter of rootstock (1.44, 1.70, 1.80 and 1.94 cm at 21, 42, 63 and 84 DAG, respectively) followed by Dumki-Al-S4 (1.08, 1.24, 1.34 and 1.42 cm at 21, 42, 63 and 84 DAG, respectively). The length and diameter of scion of Dumki-Al-S4 and Kalapara-Al-S5 were higher and statistically identical at 84 DAG. The maximum graft height was recorded in Kalapara-Al-S5 (70.60, 73.40, 76.00 and 77.10 cm at 21, 42, 63 and 84 DAG, which was statistically similar with Dumki-Al-S2. Kalapara-Al-S5, Dumki-Al-S3 and Dumki-Al-S4 showed maximum number of leaves per graft at 84 DAG. The maximum graft success of 40% was observed in both Dumki-Al-S1 and Dumki-Al-S3 at 84 DAG, whereas, other treatments had less than 20% graft success. Kalapara-Al-S5 and Dumki-Al-S2 showed significantly higher and identical number of sprouted shoots at 84 DAG. Dumki-Al-S1 showed the maximum lengths and diameters of shoot at 84 DAG. The overall performance of the stionic combinations indicated that Dumki-Al-S1 and Dumki-Al-S3 were found promising for further grafting trials with seedling rootstocks.

Influence of Foliar Spray with Urea and GA3 on Some Vegetative Growth Characteristics of Mandarin Saplings cv.Clementine.

The experiment was conducted in the lath house affiliated with the College of Agriculture / University of Anbar to investigate the effect of foliar spray of urea and GA3 on some vegetative growth traits of mandarin saplings cv. Clementine, during the period from April 2021 to December 2021, spraying urea(46% N) included 0(spray with distilled water as control), 4, 8 and 12 g.l-1 ; on the other hand, spraying GA3 included 0(spray distilled water as control), 30 and 60 mg.l-1 . The results showed that urea spray significantly increased all vegetative traits, especially 12 g.l-1 , compared to the control. In the same context, GA3 at 60 mg.l-1 spray increased all vegetative growth characteristics, like plant height, leaves number increment, leaves area, shoot number, shoot length and rootstock diameter increment, compared to the lowest value in control. Keywords: Foliar Spray, Urea, Nitrogen, GA3, Vegetative Growth, Mandarin.

Ordu ekolojisinde farklı klonal anaçlar üzerinde yetiştirilen elma çeşitlerinin fenolojik, morfolojik ve verim özellikleri

This study was carried out to determine the phenological, morphological traits and yield values of some standard apple cultivars grafted on M9 and MM106 clonal rootstocks in Ordu (Türkiye) ecological conditions. In this context, in regional conditions, blooming periods, harvest dates, rootstock and trunk development, yield and yield efficiency values of rootstock/cultivar combinations were examined. According to the research findings, the earliest first bloom (14/11 April) and full bloom (18/17 April) were observed in the Granny Smith/M9 combination, while the earliest harvest was realized in Mondial Gala/M9 (11 September, 29 August) and Galaxy Gala/MM106 (29 August) combinations. Also, the yield was determined between 2.49 kg tree-1 (Fuji/MM106)-8.95 kg tree-1 (Mondial Gala/M9), and yield efficiency was determined between 0.14 kg cm-2 (Fuji/MM106)-1.16 kg cm-2 (Mondial Gala/M9). In the principal component analysis results, the first component was associated with crown width, canopy volume, shoot diameter, yield, yield efficiency, and shoot length and explained 48.3% of the total variation. The second component explained 33.1% of the total variation of the obtained data and was determined to be related to crown height, rootstock diameter, and trunk diameter. As a result, it was concluded that the morphological development and phenological stages of the examined rootstock/cultivar combinations were generally suitable for the ecological conditions of Ordu province. Key Words: Blooming, Canopy volume, Malus domestica,

COMPARATIVE STUDY OF ROOTSTOCKS AND THEIR EFFECTS ON STIONIC ESTABLISHMENT OF THE MANGO SEEDLINGS

To explore the quality rootstock which impart better stionic establishment of the mango seedlings, we studied the comparative effect of scion and rootstock using three mango scion varieties (Sindhri, Chaunsa and Neelum) grafted on three rootstocks i.e. Ratam, Pado and Sindhri. Parameters including seed germination (%), seedling height (cm), leaves seedling rootstock-1, seedling vigor index (SVI), fresh biomass of shoot and roots (g), dry biomass of shoot and roots (g), chlorophyll content (rg), rootstock diameter (mm), scion diameter (mm), stionic ratio, leaves graft-1 and sturdiness quotient were studied. Results showed the best seed germination (88.33%), seedling vigor index (5158.74), and sturdiness quotient (3.89) in Pado rootstock. However maximum fresh biomass of shoot (20.67 g), fresh biomass of roots (16.2 g), dry biomass of shoot (12.65 g), dry biomass of roots (8.33 g) and scion diameter of the rootstocks were observed in Sindhri rootstocks. Regarding grafting data, the best stionic ratio (0.93) was observed from the scion and rootstock combination of Neelum and Pado rootstock. It was concluded that Pado rootstock performed better in terms of seedling rootstock and for successful stionic establishment of the mango seedlings

Respostas morfológicas e produtivas de videiras 'BRS Vitória' submetidas à nutribioirrigação com água residuária da piscicultura

Abstract The objective of this work was to evaluate the agronomic responses of 'BRS Vitória' grapevines under bio-fertigation with and without conventional soil fertilizer. A completely randomized design was used, with three treatments and 18 replicates. The treatments were: CFI, conventional soil fertilizer and irrigation; BF+CF, bio-fertigation and conventional fertilizer; and BF, only bio-fertigation. The following variables were evaluated: graft and rootstock diameters; plant growth; number of lateral buds; root, leaf, petiole, and gem starch contents; bunch number per plant, length, circumference, and fresh weight; berry number per bunch, length, diameter, fresh weight, soluble solid contents, titratable acidity, and pH; yield; and leaf macro- and micronutrient contents. From 100 to 150 days after transplanting (DAT), rootstock and graft diameters were similar, increasing from 250 to 300 DAT in the CFI treatment. The highest root starch content was 7.19% in BF at 150 DAT and 37.35% in BF+CF at 300 DAT. The plants in BF+CF showed the best results for bunch number per plant and fresh weight, resulting in a fruit yield 22% higher than that obtained in the other treatments. 'BRS-Vitória' grapevines show a satisfactory agronomic performance when bio-fertigated.

Determination of Phenological and Morphological Characteristics of Some Standard Pear Cultivars on Different Quince Clonal Rootstocks

This study was conducted to determine the effects of Quince BA29 (BA29), Quince A (QA), and Quince C (MC) rootstocks on phenological and morphological characteristics of ‘Deveci’, ‘Santa Maria’, ‘Abate Fetel’, and ‘Williams’ pear cultivars in Bafra (Samsun) ecological conditions between 2020-2021 years. It has been determined that the effect of rootstocks and cultivars on phenological characteristics was significant. In the study, the earliest flowering and harvest were in ‘Abate Fetel’, the latest flowering was in ‘Williams’, and the latest harvest was in the ‘Deveci’ cultivar. The highest rootstock diameter, trunk diameter and tree height were in BA29 and the lowest in MC rootstock. The highest canopy volume was determined in the ‘Santa Maria’ cultivar and the lowest in the ‘Williams’ cultivar. The effect of rootstocks and cultivars on leaf area was significant and the highest leaf area was determined in ‘Santa Maria’/QA combination. Annual shoot length of the MC rootstock was lower than the other rootstocks. It is thought that it would be more appropriate to continue the research for a long time to determine the most suitable cultivar/rootstock combination as a result of the data obtained due to the young trees of the plants where the research was carried out.

Performance of Some Standard Quince Varieties under Ecological Conditions of Bafra, Samsun

This study was carried out to determine the phenological, morphological, pomological, and yield characteristics of some standard quince cultivars. The earliest flowering occurred in ‘Limon’, and the earliest harvest was recorded in ‘Gördes’ cultivar. There were statistical differences between cultivars and years in terms of the examined characteristics. The highest rootstock diameter was observed in ‘Limon’, and the highest stem diameter was recorded in ‘Gördes’ quince cultivar. In the study, fruit weight varied between 334.91-377.93 g, geometric diameter varied between 86.02-87.26 mm, flesh firmness varied between 11.33-11.71 kg cm-2, TSS content varied between 11.88-12.70 %, pH varied between 3.31-3.62, titratable acidity varied between 0.51-0.62 %. Fruit number per tree, yield per tree, yield per stem cross-section area, and yield per crown volume were higher in ‘Limon’ than in other cultivars. Among the cultivars, fruit number ranged from 33.07 to 51.62 tree -1, yield ranged from 9.82 to 15.41 kg tree -1, yield efficiency ranged from 0.61 to 0.95 kg cm-2, and yield per crown volume ranged from 8.78 to 12.01 kg m-3. Differences between cultivars in terms of L*, a*, and chroma were observed. While, no differences were determined between cultivars in terms of b* and hueo. Among the cultivars, L* value varied from 62.58 to 76.83, the chroma varied from 33.10 to 45.11, and the hueo varied from 111.98 to 115.06. As a result of the study, it can be said that the fruit yield and quality characteristics of ‘Limon’ cultivar were higher than the other cultivars.

Survival Rate of Young Pear Trees in Different Rootstock and Cultivar Combinations under Field Conditions: Preliminary Results

This study was carried out to determine the effects of 7 different rootstocks on rootstock diameter (mm), stem diameter (mm), and plant survival ratio (%) of some pear cultivars between 2019-2021. Rootstocks, cultivars, research years, and their interactions significantly affected all examined parameters in the study, except for the interaction of year x rootstock x cultivar. The ‘Deveci’/BA29 and ‘Deveci’/OHxF333 had the largest rootstock and trunk diameters, while the 'Williams'/MC had the smallest. The Fox11 and OHxF333 rootstocks had the highest plant survival ratios, whereas the MC rootstocks had the lowest. In terms of cultivar, the maximum plant survival ratio was found in the ‘Deveci’. At the end of the first 3 years after planting, there was a decrease in the survival ratio of the plants. ‘Williams’ had the lowest rootstock diameter, trunk diameter and survival ratio. The highest trunk diameter was in the OHxF333, BA29, Fox11 and Farold40 rootstocks, and the cultivar was in the ‘Deveci’. Plant survival ratios in quince clonal rootstocks were slightly lower than in pear rootstocks. This is due to the graft incompatibility between quince rootstocks and some pear cultivars. Compatible inter-stock with rootstock and cultivar should be employed to overcome this incompatibility problem caused by localized graft incompatibility. According to the findings of this study on young plants, it is required to extend the research and conduct additional observations in order to give more precise recommendations.

Investigation of vegetative growth, yield and fruit quality characteristics of 'Hafif Çukurgöbek' loquat cultivar grafted on different quince rootstocks

‘Hafif Çukurgöbek’ loquat budded on three quince rootstock (BA-29, A, and C) were evaluated in 2018 and 2019 in Hatay, Turkey. Fruit ripening was the earliest in BA-29 rootstock in both years. The highest fruit weight was obtained from Quince-C rootstock and followed by BA-29 rootstock, and Quince-A rootstock. Quince-C rootstock yielded significantly higher values in terms of seed number, seed weight, and flesh/seed ratio. BA-29 and Quince-A rootstocks had similar values in terms of total soluble solids, while Quince-C rootstock had the lowest value. Differences between the rootstocks in terms of titratable total acidity and pH were not found to be statistically significant. Quince-C rootstock gave higher values in terms of annual shoot length, scion and rootstock diameter compared to Quince-A and BA-29 rootstocks. The differences between the rootstocks in terms of vegetative parameters were found to be statistically significant at 1% level. Our preliminary data indicate that dwarfing quince rootstocks can be used in intensive plantings of loquat. In this study, BA-29 and Quince C rootstock performed better than Quince-A. Considering yield and fruit quality based on total soluble solid, BA-29 rootstock seems the best choice.

Morphological, physiological, pests and diseases responses of citrus seedling cultivars, and their contribution to cultivar classification under nursery house and open field

Information of morphological, physiological, and pests and diseases traits between Siam or Tangerine (C. nobilis L.) and Keprok or Mandarin (C. sinensis) seedlings group under nursery and open filed condition in Indonesia has limited. The contribution of morphological and physiological characters to cultivar classification of Siam and Mandarin group has also not been yet documented. The aims of this research were to evaluate the morphological, physiological, pests and diseases responses of citrus seedling cultivars, and their contribution to cultivar classification. This research was conducted at Tlekung Experimental Garden, Citrus and Subtropical Fruits Research Institute, Batu, East Java, Indonesia from February to December 2020. One-year-old budded seedlings were planted in plastic bags (size 15x30 cm) and put in both a nursery house and open field. The plastic bags were filled with mixed media (rice hull, soil, and compost) with the ratio of 1:1:1. The experimental design was a Two Stage Nested Design consisted of two factors, these were factor A: locations (nursery house and open field) and factor B as a nested-on factor A: cultivars (Siam cv. Pontianak, Siam cv. Banjar, Siam cv. Madu, Keprok cv. Kacang, Keprok cv. Terigas, Keprok cv. Madura and Keprok cv. Gayo). The results showed that the highest flush growth percentage was showed by Keprok cv. Madura grown under open field condition, while the biggest rootstock diameter was obtained from Siam cv. Madu grown in nursery house. Siam cv. Madu grown in open field also produced the highest root dry weight and stomata density. In terms of pests and diseases, aphids (Aphis gossypii) and leaf miner (Phyllocnistis citrella) have only been affected by locations, while for diseases was not found in this study. Contribution of morphological and physiological traits to citrus cultivars classification were about 64.70%. The average percentage of change in growth and develop capacity of Keprok group from open field to the nursery house increased by 2.35%, whereas for Siam one tended to decrease by 8.96%. In general, responses of morphological and/or physiological traits between Siam and mandarin group two locations were varied. Morphological and physiological traits may also useful for supporting genetically evaluation in improving citrus breeding programs.

Effect of Foliar Spraying with Ascorbic Acid and Dry Yeast Extract on Some Vegetative Growth Traits and Chemical Content of Bitter Almond (Prunus Amygdalus Var. Amara) Seedlings

Bitter almond seedlings are an important rootstock of sweet almond and other stone fruit species. The suitable stem diameter of rootstock for budding and grafting is the aim of nurseries. Thus, the seedlings are treated with nutrients, hormones and organic materials to enhance the vegetative growth and produce healthy and typical rootstocks. In this study, the emerged bitter almond seedlings were sprayed with three concentrations of ascorbic acid (AsA) (150, 300 and 450 mg. L−1), two concentration of dry yeast extract (DY) (4 and 8 g. L−1) and their interactions, as well as the control treatment (Tap water). The treatments were applied three times throughout the 2017 growing season. The results showed that the ascorbic acid spraying especially 300 mg.L−1 significantly increased leaf area, total leaves area per plant, seedling height, stem diameter, branches length and leaves’ content of phosphorus and ascorbic acid. Meanwhile the effect of dry yeast extract treatments when separately sprayed were less than expected, but the interaction treatments affected positively on some studied measurements. The foliar spray with 150 mg.L−1 AsA + 4.0 g.L−1 DY gave the highest values of stem diameter, branch length and carbohydrate concentration in leaves of bitter almond seedlings. Finally, the foliar spray with 300 mg. L−1 AsA alone or 150 mg.L−1 AsA + 4.0 g.L−1 DY are the recommended to obtain rootstocks of suitable diameter to budding or grafting during one growing season.

Effect of the Rootstock and Cultivar on Graft Success and Sapling Development and Graft Incompatibility in Pear

This study was carried out to determine the effects of different rootstocks on graft success, sapling development and graft compatibility/incompatibility of ‘Deveci’ and ‘Williams’ pear cultivars in Samsun ecological conditions between 2014 and 2016 years. Graft incompatibility was attempted to be associated with morphological measurements in the graft union. Rootstock, cultivar and rootstockxcultivar interaction had a significant effect on the all examined parameters. In the study, graft take ratios were between 91.5-100.0%, graft sprout ratios were between 89.2-99.0% and survival ratios were between 83.7-99.0%. The graft sprout ratio was the highest in the OHxF333 and lowest was in the BA29 rootstock. The graft sprout and survival ratios were lower in quince rootstock than in pear rootstocks. Rootstock diameters were higher in the OHxF333 and seedling rootstocks than in the Fox11 and BA29 rootstocks. Graft union diameter and shoot diameter were lower in the Fox11 than the other rootstocks. Shoot length was higher in the OHxF333 than the other rootstocks. Especially considering the graft success and the diameter measurements made in the graft union, it has been found that some scion/stock combinations may show graft incompatibility. The ‘Williams’/BA29 combination may be incompatible due to the lower survival ratio and diameter values in the graft union than other combinations. Although graft success is sufficient, it should be noted that the ‘Williams’/Fox11, whose rootstock diameter and graft union diameter are lower than the others, may show graft incompatibility. ‘Deveci’ cultivar shows good compatibility with all rootstocks due to the higher graft success and sapling performance.

Physiological changes and growth of soursop plants under irrigation with saline water and H2O2 in post-grafting phase

The low availability of water associated with high salt concentrations in irrigation water has become one of the leading challenges for agricultural production in the semiarid region of Northeastern Brazil. Thus, the study of strategies to enable the use of saline water in agriculture is essential. From this perspective, this study aimed to evaluate alterations in gas exchange, chloroplast pigments, and cell damage in soursop (Anonna muricata L.) irrigated with saline water and under exogenous application of hydrogen peroxide (H2O2) in the post-grafting phase. A study was conducted in Campina Grande, PB, under greenhouse conditions. The treatments were distributed in a randomized block design, in a 4 × 2 factorial arrangement, consisting of four levels of electrical conductivity of water (ECw; 1.6; 2.4; 3.2 and 4.0 dS m-1) and two concentrations of H2O2 (0 and 20 µM) with four replications. Irrigation water salinity from 1.6 dS m-1 caused changes in the stomatal conductance, respiration, and internal CO2 concentration of soursop plants. A 20 µM concentration of H2O2 reduced the effects of salinity on transpiration and CO2 assimilation values, in addition to promoting the biosynthesis of photosynthetic pigments and reducing cell damage in soursop plants, at 150 days after transplantation. The exogenous application of 20 µM H2O2 reduced the deleterious effects of salinity on the stem diameter of both rootstock and scion in soursop plants irrigated with ECw of 1.6 dS m-1. The exogenous application of 20 µM H2O2 was not efficient in mitigating the damage caused by salinity on the stem diameter of the soursop at grafting point.

Desempenho produtivo de maracujazeiro amarelo em área com Fusarium solani

The use of tolerant rootstocks has shown good results in the control of Fusarium wilt in yellow passion fruit, which is considered one of the main problems in the crop as it affects the plant’s root system and has no chemical control. The present study aimed to evaluate the survival rates, the agronomic performance of the plants and the physical characteristics of the yellow passion fruit (Passiflora edulis Sims) grafted on different rootstocks in area with Fusarium wilt. The experiment was carried in Pracinha, in the State of São Paulo, Brazil, from August 2014 to May 2015, and a randomized block design was adopted, with five treatments, five replications and four plants per plot. The treatments were constituted by the following rootstocks: Passiflora alata Dryand, Passiflora gibertii N.E. Brown, Passiflora caerulea Linnaeus, double grafting P. gibertii x P. edulis and plants without grafting. The stem diameter of rootstock and the graft, the lenght of secondary branches, the number of tertiary branches, the number of surviving plants, the longitudinal and transversal diameters of the fruits, the number and mass of fruits and the productivity were evaluated. The largest diameter of the rootstock was observed in Passiflora alata while in the graft it was in plants of Passiflora edulis. The length of the secondarty branches and the number of tertiary branches were affected by the type of grafting and the rootstock used. The highest survival rates were observed in Passiflora alata (90%) and Passiflora gibertii (100%). The highest number of fruits per plant and productivity occurred in plants grafted on Passiflora gibertii. The adoption of double grafting using Passiflora gibertii x Passiflora edulis and simple grafting with Passiflora caerulea were not effective in the control of this disease. The species Passiflora gibertii and Passiflora alata showed the potential to be used as a rootstock for yellow passion fruit.