Lint Index Research Articles

EVALUATION OF COTTON MUTANTS FOR WATER DEFICIT CONDITION

Cotton (Gossypium hirsutum ssp.) belongs to the genus Gossypium from the family Malvaceae. About 100 genera are in the family Malvaceae and about 1500 species. It is grown worldwide for oil, seed, and fiber. A major problem in cotton cultivation is a drought that’s why this experiment was planned to evaluate the cotton mutants for drought tolerance. A variety of cotton Cyto-155 was mutated with gamma rays at different intensities such that 20kR, 25kR, 30kR, and 35kR, to obtain some genetic variation. Mutated seed along with non-mutated of that cotton variety was sown in split plot layout under randomized complete block design with three replications, under the normal irrigated condition with six irrigations and water stress condition with two irrigations at maturity data was collected for plant height, number of monopodial branches, number of sympodial branches, bolls per plant, boll weight, seed index, GOT%, lint index, seed cotton yield, relative water content and excised leaf water loss.Results showed a highly significant effect of genotype and water regime on all observed traits. Water regime × genotype interaction was also highly significant for plant height, number of sympodial branches, seed index, boll weight, lint index, and excised leaf water loss. Water regime × genotype interaction was non-significant for number of monopodial branches, bolls per plant, GOT%, seed cotton yield, and relative water content. Mean comparison indicated that seed mutated at 30kR and 35kR performed well for all yield-related traits in both irrigated conditions.

Genetic Studies in Different F2 Segregating Population for Yield and Fiber Quality Traits in Cotton (Gossypium hirsutum L.)

The present research was conducted to assess six F2 population and their six parents for various yield and fiber contributing attributes. F2 segregating population have more variability with a greater adaptation against stress. Analysis of variance results indicated that genotypes for all traits were significant except number of monopodial branches and total nodes per plant. The highest value of heritability was calculated for seed cotton yield, while the lowest value was observed for the first fruiting branch node. Correlation matrix for overall F2 populations along with their parents manifested that yield was significantly and positively associated with plant height, height to node ratio, first fruiting branch node, total bolls per plant, ginning out turn %, lint index and short fiber index. Path analysis results showed that yield was directly and positively influenced by number of sympodial branches per plant, height to node ratio, total bolls per plant, seed index, fiber uniformity, short fiber index, micronaire value and fiber strength. The variety Mubarak showed maximum mean values for yield contributing and fiber related trait like sympodial branches, boll weight, GOT% and lint index, BS80 for bolls per plant and seed cotton yield, CM595 for seeds per boll, fiber strength and fiber length and FH142 for fiber uniformity. F2 cross combination MNH886×Mubarak followed by CM595×MNH886 showed maximum value of ranges for the different attributes and succeeding generations of these two populations may be used for selection of potential genotypes for development of high yielding varieties.

Evaluation of genetic gains of some quantitative characters in Egyptian cotton cross (Giza 86 × Menoufi) under water deficit stress

This work was carried out to select cotton genotypes adapted to semi-arid climate conditions cultivated under irrigation for high yields and the standards of the fiber quality properties required by the textile industry. Also to determine the predicted and realized gains from different selection indices to improve some economic characters under water stress conditions. Except for lint percentage and Pressley index, F4 generation reduced PCV and GCV values for all studied characters due to reduction in genetic variability and heterozygosity due to different selection procedures that exhausted a significant part of variability. Except for fiber length and micronaire reading, mean performance in the F4 generation was revealed to be higher than those in the F3 generation for all studied characters. However, micronaire reading was lower (desirable) in F4 than F3 generation. Generally, genotypic correlations were higher than phenotypic correlations. Direct selection for lint index (Ped.3) was the most efficient in improving lint cotton yield/plant and bolls/plant. However, the multiplicative index involving all studied characters (I.5) exhibited the highest values for boll weight. Also, the Ped.2 index (direct selection for lint percentage) proved to be the most efficient in improving seed and lint indexes. Direct selection for lint cotton yield/plant (Ped.1) could produce the highest desirable values for lint percentage and seed per boll with a relatively reasonable yield. A selection index involving yield and its components (I.3) is recommended in improving uniformity index, fiber strength, and micronaire reading. The superior five families released from these indices in F4 generation exceeded the better parent for lint cotton yield/plant, bolls/plant, boll weight, seeds/boll, lint index, and reasonable fiber traits. These families could be continued to further generations as breeding material for developing water deficit tolerant genotypes.

Genetic studies of correlation and path coefficient analysis for yield and fibre quality traits in cotton (Gossypium hirsutum L.)

Sixteen Line × Tester hybrids were studied to better understand yield component relationships. The number of bolls per plant and boll weight had a substantial positive correlation and a high direct influence on seed cotton yield per plant, according to both association and route analysis analyses. Finally, selecting some features, such as number of bolls per plant and boll weight, directly impacts seed cotton yield per plant. Furthermore, number of bolls per plant had a substantially favourable indirect influence on number of sympodial branches per plant, micronaire value, and lint index through number of sympodial branches per plant, micronaire value, and lint index. The lint index had a significant indirect impact on the seed index. Selection based on these qualities indirectly increases seed cotton output per plant by a large margin. As a result, the yield and yield potential have improved. Key words: Path analysis, Cotton, Correlation co-efficient and Gossypium hirsutum L

Genetic Variance, Heterosis and Correlation for Yield and Fibre Quality in Four F1 Cotton Hybrids

The extent of phenotype and genotype variances, traits correlation and Principal components were investigated in F1 inter-varietal hybrid cotton. The F1 crosses were evaluated alongside their F2s, the eight involved parents and a single standard check. All the hybrids demonstrated positive and significant Relative Heterosis and Heterobeltiosis for sympodial branches and seed cotton yield per plant. Cross IV recorded the highest value for inbreeding depression of 61.7% in Seed cotton yield per plant. Days to first bursting recorded high heritability in narrow sense in IV while number of seeds per boll had same in Cross I. Cross I also recorded high genetic advance for Plant height, number of seeds per boll, seed cotton yield per plant, lint index, number of sympodia per plant and bundle strength, suggesting the effects of additive and dominant genes and absence of epistasis. Meanwhile, 87% of the accumulative variability was accounted for by the principal component 1, 2 and 3; the variability was mostly associated with plant height, seed cotton yield per plant, number of monopodia per plant, days to 50% flowering and bolls weight. The results revealed adequate genetic variability which can be exploited in a selection program for the traits. The positive and significant heterobeltiosis and standard heterosis exhibited in the F1 hybrids can be harnessed for commercial purposes after further evaluation.

Combining ability and heterosis studies in cotton (Gossypium hirsutum L.) for yield and fibre quality traits

Cotton is India’s most important cash crop and it is used for agricultural and industrial purposes for all over the world. The greatest way for identifying superior hybrids and best combiners of parents is by L×T design. For analyzing the combining ability and heterosis for various yield attributing variables as well as quality traits, the parents viz., four lines and four testers were crossed to produce sixteen hybrids. MCU5 × KC3 cross contributed to positive, highly significant heterosis for the traits viz., the number of sympodial branches, lint index and the number of bolls per plant, along with highly significant values of sca for the traits viz., the number of sympodial branches, seed cotton yield per plant and micronaire. CO14 × NDLH1938 had a highly significant sca effect for the trait of upper half mean length along with significant heterosis for the traits, viz., boll weight and seed cotton yield per plant. Therefore, MCU5 had the best gca value for the upper half mean length among the four lines. The KC3 tester had a high gca value, indicating that it contributes to additive genes among the four testers. For some traits, not all good combiners have good sca effects. In the majority of the qualities investigated, non-additive or dominant gene action was seen. Heterosis breeding can be used to exploit the amount of available vigour.  Keywords: Combining ability, G. hirsutum. L., intraspecific hybrids, heterosis, Cotton.

Combining ability and heterosis for yield contributing and fibre quality traits in the hybrids of Gossypium hirsutum L.

The present study was investigated in thirty five hybrids of Gossypium hirsutum L. for combining ability and heterosis for ten yield and fibre contributing traits. These hybrids were obtained by the crosses made between seven lines and five testers. None of the crosses was  superior for all the traits studied for the mean performance. The hybrid TCH 1199 × GTHV 323 showed the highest mid and better parent heterosis for the lint index and the hybrid TCH 1828 × RHC 1409 exhibited the highest significant mid and better parent heterosis for ginning outturn. The characters viz., boll weight and single cotton yield per plant were identified to have the highest significant mid and better parent values in the hybrid BSH 18 × RHC 1409. For yield contributing traits viz., the number of sympodial branches per plant and the number of bolls per plant out numbered in the hybrid CO 14 × KC 3 with the maximum standard heterosis among the thirty five hybrids. Combining ability analysis exhibits the dominance of non- additive gene action in all yield and fibre quality contributing traits. Among the lines CO 14 and TCH 1828 were estimated as the best combiners for yield and quality traits, respectively. Among the testers, KC 2 and KC 3 were found to be the best among all the five testers. The hybrid BSH 18× RHC 1409 exhibited the highest sca for the boll weight and seed cotton yield per plant and the hybrid BSH 18 × GISV 323 exhibited the highest sca for the quality traits viz., ginning out turn and upper half mean length; TCH 1828 × KC 3 and CO 14 × KC 2 best performed hybrids for sca values for the quality traits viz., elongation length and micronaire values. Keywords: Cotton, F1 hybrids, heterosis, combining ability.

Impact of Plant Spacing and Nitrogen Rates on Growth Characteristics and Yield Attributes of Egyptian Cotton (Gossypium barbadense L.).

This current study was performed to determine the influences of plant spacing, Nitrogen (N) fertilization rate and their effect, on growth traits, yield, and yield components of cotton (Gossypium barbadense L.) cv. Giza 97 during the 2019 and 2020 seasons. A split plot experiment in three replicates was utilized whereas the cotton seeds were planted at 20, 30, and 40 cm, as main plots and nitrogen at 75, 100, and 125%, was in subplots. The results revealed that the planting spacing at 40 cm significantly (p ≤ 0.01) increased plant height, number of fruiting branches per plant, number of bolls per plant, boll weight (BW), lint percentage (L%), seed cotton yield (SCY), lint cotton yield (LCY), seed index and lint index by 165.68 cm, 20.92, 23.93, 3.75 g, 42.01%, 4.24 ton/ha, 5.16 ton/ha, 12.05, 7.86, respectively, as average in both seasons. The application of N fertilizer rate at 125% caused a maximum increase in growth and yield parameters i.e., plant height (169.08 cm), number of vegetative branches (2.67), number of fruiting branches per plant (20.82), number bolls per fruiting branch (1.39), number of bolls per plant (23.73), boll weight (4.1 g), lint percent (41.9%), seed index (11.8 g), and lint index (8.2), while the plants treated with 100% N rates exhibited highest seed cotton yield (4.3 ton/ha) and lint cotton yield (5.6 ton/ha), as average in both seasons. Combining plant spacing at 40 cm between plants with a 100% N fertilizer rate recorded the highest lint cotton yield (5.67 ton/ha), while the highest seed cotton yield (4.43 and 4.50 ton/ha) was obtained from 125% N fertilizer rate under planting spacing 20 and 40 cm, respectively. Conclusively, a wide density (40 cm) with 125% N is a promising option for improved biomass, cotton growth, yield, physiological traits, and fiber quality.

Estimation of Combining Ability Influence on F1 Generation for Various Quantitative and Qualitative Traits in BT and Non-BT Cotton Gossypium hirsutum L.

General and specific combining ability is one of the important plant breeding tools used for best selection of F1 group based on the growth and yield contributing factors. This experiment was carried out during 2014 under agro-ecological condition of Tandojam, Sindh Pakistan. In this study three lines of Bt-008, IR-1525 and neelam-131 as female parents and three testers such as NIA Sadori, NIA Ufaq and NIA Perkh as male parents were investigated based on randomized complete block design which were replicated thrice. In F1 generation, the mean squares for combining ability for target characteristics displayed highly significant GCA effects in lines for all traits except lint index. But in case of testers, the GCA effects were significant for sympodial branches plant-1, seed index and seedcotton yield plant-1 and highly significant only for monopodial branches plant-1, GOT%, staple length. While, mean squares values for the interaction of line x tester revealed highly significant SCA effects for plant height, monopodial branches plant-1, boll weight and GOT%. The two parents Neelam-131 and NIA Ufaq manifested higher general combining ability effects and were good general combiners for yield and yield components and can make a potential material for varietal seed development. For yield contributing characters, crosses IR-1525 x NIA Ufaq and IR-1525 x Perkh showed significant SCA effects among the rest of crosses. Consequently, it is advised that those crosses to be selected having high SCA with better GCA for refining a specific trait.

Seed-score (S-score), a Method for Characterizing Seed and Lint Indices of Cotton Lines

Increased lint yields of cotton (Gossypium hirsutum L.) cultivars during recent years have been accompanied by increased lint percentages and decreased seed size. Small seed size can be associated with low seed and seedling vigor and can contribute to ginning problems. In contrast, large seed size can be associated with thin seed coats and lower lint yields. Our objective was to develop an index that would characterize seed size and lint weight per seed. Seed-score (S-score) attempts to normalize seed index (SI) and lint index (LI) into a single index with penalties for both high and low SI values and no penalty for high LI values. Location × cultivar means (6,453 lines) for SI and LI extracted from the 1999 through 2020 Arkansas Cotton Variety Testing program produced mean SI of 10.17 ± 1.07 g and mean LI of 7.01 ± 0.90 g. These data were used to develop the normalization and weighting of factors for S-score. S-score was then calculated for transgenic cultivars evaluated in the 2015 through 2020 Arkansas Cotton Variety Tests. Within each year, cultivar was the major source of variation for SI, LI, and S-score. The 2015-2017 data set and the 2018-2020 data set produced 12 and 15 common cultivars, respectively. S-score among cultivars varied by more than 25 points in each data set and was relatively consistent over years. S-score will most likely be used as a secondary selection criterion in cotton cultivar development programs.

Genetic Studies in Different F2 Segregating Population for Yield and Fiber Quality Traits in Cotton (Gossypium hirsutum L.)

Present research was conducted for assessment of six F2 populations and their parents for various yield and fiber contributing attributes. F2 segregating population have more variability with a greater adaptation against stress. F2 generation provide more chance of selection for the improvement of genotypes because every plant is different from another plant. Analysis of variance results indicated that genotypes for all traits were significant except number of monopodial branches and total nodes per plant. Highest value of heritability was calculated for seed cotton yield while lowest value was observed for first fruiting branch node. Correlation matrix for overall F2 populations along with their parents manifested that yield was significantly and positively associated with plant height, height to node ratio, first fruiting branch node, total bolls per plant, ginning out turn %, lint index and short fiber index. Path analysis results showed that yield was directly and positively influenced by number of sympodial branches per plant, height to node ratio, total bolls per plant, seed index, fiber uniformity, short fiber index, micronaire value and fiber strength. The variety Mubarak showed maximum mean values for yield contributing and fiber related trait like sympodial branches, boll weight, GOT% and lint index, BS80 for bolls per plant and seed cotton yield, CM595 for seeds per boll, fiber strength and fiber length and FH142 for fiber uniformity. F2 cross combination MNH886×Mubarak followed by CM595×MNH886 showed maximum value of ranges for the different attributes and succeeding generations of these two populations may be used for selection of potential genotypes for development of high yielding varieties.

Assessment of yield components and fibre quality traits in an introgressed population derived from Gossypium hirsutum and G. barbadense

The introgressed populations developed from crosse between Gossypium hirsutum and G. barbadense were used to assess genetic variation for yield components and fibre quality traits. A difference among introgressed lines and parental lines was significant for all traits except sympodial branches, node number, uniformity index and fibre elongation. The lines with high ginning outturn showed higher values for plant height, seed index and lint index than the lines with cluster boll bearing, round boll lines and fibre length-strength lines. However, the majority of introgressed lines had lower values for boll number and seed cotton yield as compared to the parental lines Suraj and NH 615. For fibre strength and ginning outturn, the lines viz., CNH 31-90 and CNH 29-90 had higher fibre strength of 30.5 and 30.1 g/tex, respectively. CNH 19-5 (35.8 mm) and CNH 19-4 (33.9 mm) showed higher values for fibre length which was significantly higher than the variety Suraj (31.6 mm). Similarly, CNH 29-90 (30.1 g/tex), CNH 31-90 (30.5 g/tex) as well as CNH 19-4 and CNH 42-6 (29.9 g/tex) displayed higher values for fibre strength. Lines viz., CNH 44-31, CNH 47-31, CNH 19-4, CNH 19-5 and CNH 42-6 were identified for a desirable combination of yield and fibre quality and ginning percentage. CNH 31-90, CNH 33-94 and CNH 48-4 had a combination of fibre quality and high ginning percentage. In the majority of lines, the mean values for fibre length and strength were the most biased towards the G. hirsutum variety Suraj and NH 615. Fibre quality traits viz., length and strength, were highly and positively correlated (0.41) suggesting that selections can be made for simultaneous improvement of fibre length and strength. Fibre length (-0.04) and fibre strength (-0.06) had a lesser negative association with seed cotton yield indicating breaking of strong negative correlation between yield and quality (either length or strength) in interspecific lines between G. hirsutum and G. barbadense. Key words: Correlations, Fibre quality, G. barbadense, Introgression lines, Yield components, Upland cotton

Effects of Salinity Stress on Some Growth, Physiological, and Biochemical Parameters in Cotton (Gossypium hirsutum L.) Germplasm

ABSTRACT The production of cotton is negatively affected by salinity. For this purpose, 8 parents and their 16 F1 hybrids were evaluated under saline stress (15 dSm−1) in Line × Tester fashion. Mean values of plant height, number of bolls plant−1, boll weight, lint weight, seed cotton yield plant−1, seed index, no. of seeds boll−1, seed mass boll−1, lint mass boll−1, seed volume per 100 seeds, fiber strength, fiber length, lint%, K+, K+/Na+ ratio, CAT, TSP, chlorophyll a, b, and relative water contents decreased under salt stress whilst the values of lint index, seed density, fiber fineness, Na+, H2O2, SOD, POD carotenoids, malondialdehyde, phenolic contents, ascorbic acid, and flavonoids increased under saline conditions. Under saline MS-71× CRS-2007, MS-71× KAHKASHAN, and IUB-65 × FH-312 exhibited performed better than other genotypes for most traits. For fiber quality traits IUB-65× CRS-2007 and IUB-65× FH-312 showed the highest value under salt stress. Improved identified cotton genotypes can enhance our capacity to grow cotton in salt-affected soils and the key morpho-biochemical traits can potentially be exploited to obtain higher and more stable crops yield under stressed environments.

Genetic analysis of biochemical, fiber yield and quality traits of upland cotton under high-temperature

ABSTRACT To understand the effect of heat stress on morphology and physiology of the cotton, eight cotton genotypes with their 15F1 hybrids (five lines, three testers) were grown in the field conditions under randomized complete block design (RCBD) with two treatments i.e. normal and high-temperature stresses with two replications followed by split-plot arrangement. Data were collected for biochemical and yield-related parameters. Mean values of all studied traits were reduced significantly under high-temperature stress whilst the mean value of lint%, catalase activity, total soluble proteins, peroxidase, and carotenoids were increased under high-temperature. Under both conditions, the number of bolls, boll weight, seed cotton yield, lint index, seed mass per boll, hydrogen peroxide content, catalase activity, total soluble proteins, carotenoids, and chlorophyll contents had high heritability values along with high genetic advance percent mean which revealed, these traits were controlled by additive gene action. The lint%, seed index, short fiber index, fiber strength, fiber fineness, upper half mean length and peroxidase activity had high heritability with moderate genetic advance under heat stress conditions which showed, these traits were controlled by non-additive gene action. Under both temperature conditions, FH-458, IUB-65, CRS-2, and FH-313 were good general combiners for physicochemical and yield-related traits. The cross combination of IUB-013× CRS-2 and FH-458× FH-313 were good specific combiner for plant height and seed cotton yield whilst for fiber quality and biochemical traits, the best specific combiners were VH-329× FH-313 and IUB-013× CRS-2. These identified parents and cross combinations might be used for improving already present commercial varieties under high-temperature stress.

Registration of two Arkot 0912 sister cotton germplasm lines

AbstractArkot 0912‐18 (Reg. no. GP‐1098, PI 697032) and Arkot 0912‐41 (Reg. no. GP‐1097, PI 697031) are conventional cotton (Gossypium hirsutum L.) germplasm lines released by the Arkansas Agricultural Experiment Station in December 2020. Both lines were derived from crossing ‘UA48’ and ‘UA222’. They produced higher lint yields than their parents over 5 yr and at four test sites in Arkansas. Both produced similar lint yields at each test site. Over test sites, the lines produced about 13 and 24% higher lint yields than UA222 and UA48, respectively. Arkot 0912‐18 produced the highest lint yield of all entries evaluated in the 2017 Regional Breeders Network Test. Over all locations of the 2017 Regional High Quality Test, lint yields of Arkot 0912‐41 ranked fourth out of 20 genotypes (second‐highest of 11 conventional genotypes) and equaled the lint yields of DP 1646 B2XF (U.S. patent no. 9,961,845) and PHY 444 WRF. Both lines produced higher lint percentage and lint index and were taller than either parent. Leaf pubescence, stem pubescence, and bract trichome density of each line exceeded both parents. Visual ratings of Verticillium wilt for Arkot 0912‐18 exceeded those of UA48. Both lines displayed high resistance to bacterial blight and were similar to UA222 and UA48 in their response to other diseases. The lines were more resistant to tarnished plant bug than UA48 but were more susceptible to tarnished plant bugs than UA222. Measurements of fiber quality for the two lines were intermediate between that of UA48 (excellent fiber quality) and UA222 (good fiber quality).

Genetic variability for yield and fiber related traits in genetically modified cotton

BackgroundCotton (Gossypium hirsutum L.) is grown for fiber and oil purposes in tropical and sub-tropical areas of the world. Pakistan is the 4th largest producer of cotton. It has a significant contribution in the GDP of Pakistan. Therefore, the present study was performed to assess the genetic variations and genetic diversity of yield and fiber quality traits in cotton and to analyze the associations present among them.ResultsAnalysis of variance exhibited significant variation for all studied traits except total number of nodes and the height to node ratio. The phenotypic coefficient of variation was higher than the genotypic coefficient of variation for all studied traits. Plant height, monopodial branches, total number of bolls, lint index, seed index, and seed cotton yield displayed high heritabilities in a broad sense with maximum genetic advance. Correlation analysis revealed that seed cotton yield had a significant positive association with plant height, the number of monopodial branches, the number of sympodial branches, ginning outturn (GOT), the number of bolls, seed per boll, seed index, uniformity index, the number of sympodial branches, reflectance, and seed index at the genotypic level while a significant positive relationship was observed with plant height, the number of sympodial branches, boll number, and GOT. Plant height, monopodial branches, GOT, boll weight, seeds per boll, and short fiber index exerted direct positive effects on seed cotton yield. The first 6 principal component analysis (PCs) out of the total fourteen PCs displayed eigenvalues (> 1) and had maximum share to total variability (82.79%). The attributes that had maximum share to total divergence included plant height, uniformity index, the number of sympodial branches, seed per boll, GOT, seed cotton yield, and short fiber index.ConclusionThe genotype AA-802, IUB-13, FH-159, FH-458, and CIM-595 were genetically diverse for most of the yield and fiber quality traits and could be utilized for the selection of better performing genotypes for further improvement.

GENETIC VARIABILITY AND INTERRELATIONSHIPS AMONG EARLINESSCHARACTERS, YIELD-RELATED TRAITS AND FIBER QUALITY PARAMETERS IN CERTAIN COTTON GENOTYPES

This study aimed at assessing genotypic variability among six cotton genotypes and their 15 F1 crosses, clarifying the relationship between cotton yield and important agronomic traits, and determining the amount of direct and indirect impacts of attributed traits on cotton yield. Six long-staple and high-yielding cotton genotypes and their 15 F1 crosses were evaluated in the summer season of 2017 at the Experimental Farm of Sids Research Station, Beni-Suef, Egypt. The obtained results revealed highly significant differences among parental genotypes and their F1 crosses for all evaluated traits.The phenotypic coefficient of variation (PCV) was greater than the genotypic coefficient of variation (GCV) for all studied traits. The difference between PCV and GCV was very low for days to first flower unfolding, days to first opened boll,and uniformity ratio, while was relatively higher for number of nodes to first sympodial branch, lint index, micronaire reading, fiber strength, 100-seed weight, seed yield/plant, and lint yield/plant. The heritability in broad sense (h2b) values were high for days to first flower unfolding, days to first opened boll. Moreover, number of opened bolls/plant and boll weight/plant had positive and significant genotypic and phenotypic correlation with seed yield/plant and lint yield/plant. Furthermore, number of opened bolls/plant, boll weight/plant, and 100-seed weight exhibited positive direct effect on seed cotton yield. The highest indirect effects on seed cotton yield were assigned for number of opened bolls/plant, boll weight/plant, 100-seed weight, lint percentage, and lint index through lint yield/plant. The obtained results provide valuable information for cotton breeding programs to develop new high-yielding genotypes with acceptable fiber quality parameters

English

A field experiment was conducted to evaluate the 45 F1 hybrids derived from 10×10 half diallel fashion along with ten parents and one standard check GN.Cot.Hy-14 were sown in randomized block design with three replications during kharif -2017 at Cotton Research Station, Junagadh Agricultural University, Junagadh. The genetic components of variation were determined for 12 characters viz., days to 50% flowering, days to 50% boll opening, plant height (cm), number of monopodia per plant, number of sympodia per plant, number of bolls per plant, boll weight (g), seed cotton yield per plant (g), ginning percentage (%), seed index (g), lint index (g) and oil percentage (%).The estimate of the components of variation revealed significant results for both additive (D) as well as dominance effects (H1 and H2) for all the characters except plant height non-significant H2 component, but in majority of traits (except plant height, lint index) H1 was higher than D indicating dominance components were important in the inheritance of seed cotton yield and its components. The average degree of dominance (H1/D)1/2 was found to be more than unity for all the traits (except plant height, number of monopodia per plant and lint index indicating partial dominance) indicating over dominance. Asymmetrical distribution of positive and negative genes in the parents was observed for all the traits. High estimates of heritability in narrow sense was observed for days to 50% flowering, days to 50 % boll bursting, number of monopodia per plant, ginning percentage (%), lint index (g) and oil content (%) suggesting that selection based on these attribute would lead to rapid improvement. Due to preponderance of non-additive gene effects of seed cotton yield per plant and most of its component traits, heterosis breeding would also be practically feasible in cotton.

English

The present Investigation was carried out to study the genetic variability, coefficient of variance, heritability and genetic advance in American cotton. The material was evaluated in a Randomized Block Design (RBD) with three replications during kharif 2019. In this experiment analysis of variance indicated that significant variation present among the accessions of the upland cotton for all the traits under study. The highest genotypic (GCV) and phenotypic coefficient of variation (PCV) were exhibited by the number of monopodia per plant, number of bolls per plant and boll weight. High heritability with high genetic advance was observed in the boll weight, number of monopodia per plant, number of bolls per plant, seed cotton yield per plant, number of sympodia per plant and lint index. The combination of the high heritability and high genetic advance provide the clear image of the trait in the selection process.

English

The present Investigation was carried out to study the variability, heritability and genetic advance in desi cotton. The material was evaluated in a Randomized Block Design (RBD) with three replications during kharif 2019. In this experiment analysis of variance indicated that significant variation present among the accessions of the desi cotton for all the traits under study. The highest genotypic (GCV) and phenotypic coefficient of variation (PCV) were exhibited by the number of bolls per plant. High heritability with high genetic advance was observed in number of bolls per plant, the number of monopodia per plant, lint index, seed cotton yield per plant and number of sympodia per plant. The combination of the high heritability and high genetic advance provide the clear image of the trait in the selection process.