Heterosis and variability

The possibility of commercial exploitation of hybrid vigour in crops like green gram and black gram depends upon the substantial heterosis for YMV and seed yield coupled with economically viable method of producing hybrid seeds.

27p cothumenhmong9 18-01-2021 15 1   Download

There is a need to diversify CMS lines and restorer lines in different genetic background to create some variation and utilize them in hybrid breeding. Present research efforts were made to enhance the variability in CMS lines through conversion of dwarf four lines viz., Dwarf 30 cm, Dwarf 45 cm, Dwarf 60 cm and Dwarf 90 cm into cytoplasmic male sterility. Variation in the height of the parents will help in identifying the out crossed seeds from CMS and selfed-seeds from the hybrid populations.

10p cothumenhmong9 18-01-2021 10 1   Download

Line × Tester analysis was carried out using 13 lines and 3 testers to estimate heterosis on seed yield and its contributing characters in Opium Poppy. The 39 resulting hybrids along with their parents were evaluated in Randomized Block Design during Rabi 2019-2020. The analysis of variance revealed the presence of variability among parents and crosses for the characters studied.

8p trinhthamhodang9 16-12-2020 35 2   Download

The present investigation entitled studies on heterosis for yield and its components of bitter gourd (Momordica charantia L.) using 9 parents and 1 standard variety and their 36 crosses for 11 quantitive traits was carried out in summer and rainy seasons of 2015. The analysis of variance for experimental design revealed the existence of adequate genetic variability in experimental material for all traits under study.

9p nguaconbaynhay8 13-10-2020 16 2   Download

Using molecular markers one can examine genetic diversity of species, cultivars, lines and forms of sunflower, identify genotypes, systematize collection material, classify heterosis groups and construct genetic maps. Fourteen parental genotypes of sunflower viz.,CMS-2A, CMS-821A, CMS-850A, R-10-46-2A, CMS-A4, CMS-A6, CMS-A10, R-GM-39, R-GM-41, R-GM-49, R-GM-69, 83-Br, R-393 and R2F01120B were analyzed for genetic diversity using 15 RAPD and 44 SSR primers. The genetic similarity index computed considering pooled data of SSR and RAPD markers showed very wide range from 0.18 to 0.

8p chauchaungayxua8 03-10-2020 15 2   Download

The present study was carried out for development of hybrids in ridge gourd for earliness and yield traits. Twenty eight crosses were developed through half diallel fashion. Evaluated the crosses and along with their parents in Randomized block design (RBD). Significant differences found in the analysis of variance for early and yield related traits which indicates enormous genetic variability present in the ridge gourd.

6p quenchua8 29-09-2020 14 1   Download

A set of 24 cross combinations were developed through Line × Tester mating system involving 11 diverse genotypes of tomato and observations were taken for yield and yield attributing characters to study the extent of heterosis in the crosses. Tomato is an autogamous crop and has originated in the Peru region of South America. The experiment was conducted in Randomized Complete Block Design (RCBD) with three replications.

8p angicungduoc6 22-07-2020 12 2   Download

A study was conducted to assess the extent of heterosis and combining ability of muskmelon in a half diallel mating design. Forty five F1 hybrids and ten inbred lines were evaluated for fourteen different characters during 2014-15 at Department of Vegetable Science, Punjab Agricultural University, Ludhiana. The analysis of variance indicated significant variability among all the genotypes for all the traits except fruit weight and acidity.

11p caygaocaolon5 27-05-2020 24 2   Download

Genetic Diversity (GD) present in the germplasm is pre-requisite for crop improvement as it helps in the development of superior recombinants. Knowledge about Genetic diversity between the genotype can be utilized for the selection of diverse parents in hybridization to exploit the heterosis. Mahalanobis D² statistics assist in grouping the genotypes into different clusters.

7p cothumenhmong5 17-05-2020 8 1   Download

The investigation was conducted to assess the heterosis in respect to leaf yield and its component characters through 6 x 6 diallel mating design involving thirty hybrids and six parents in FCV tobacco during kharif 2016 at ZAHRS (Zonal Agricultural and Horticultural Research Station), College of Agriculture Shivamogga.

8p cothumenhmong5 17-05-2020 4 0   Download

The objective of this study was to breed muskmelon hybrids possessing higher TSS, flesh, and rind thickness, early and total yields; lower seed cavity; and resistance to fruit fly. Eight genetically diverse parents viz., Kesar, exotic collections (EC-2, EC-3, EC-4, EC-5), and indigenous collections (GP-210, GP-211, GP-141) were crossed in a diallel fashion excluding reciprocals. The resulting 28 F1's were evaluated with their parents in completely randomized block design with three replications under open field conditions.

14p nguaconbaynhay5 16-05-2020 22 0   Download

The present study was carried out for development of hybrids in sponge gourd for earliness and yield traits. Twenty eight crosses were developed by crossing 8 × 8 diallel mating design (excluding reciprocal). Evaluated the crosses and along with their parents in randomized block design (RBD). Analysis of variance indicated highly significant differences for growth, earliness and yields characters, which suggesting presence of wide genetic variability. The magnitude of standard heterosis was found in desirable direction for early and yield traits viz.

9p caygaocaolon3 27-02-2020 20 0   Download

Random amplified polymorphic DNA- Polymerase chain reaction (RAPDPCR) was employed to assess the genetic variability and phylogenetic relation among fifteen breed of Gangatiri animals Viz. fourteen animals (cow no.288, 348, 394, 365, 313, 364, 293, 319, 283, 208, 306, 322, 476, 478) are both sexes and one bull were selected randomly. The DNA samples were isolated from a total of fifteen animals from Gangatiri cows and three random primers were selected. The genetic distance was found higher between cow no. 288 and 476 (D = 0.82697) and lower (D = 0.17647) between cow no 478 and 476.

7p trinhthamhodang3 22-02-2020 24 0   Download

The present investigation was to study the molecular diversity of twelve cotton genotypes, in order to select the suitable divergent parent for heterosis breeding. Totally, 55 primers were used to diversify these genotypes and 40 pairs showed clear, scorable and unambiguous bands. Out of 40, 25 primer pairs (62.55 %) were found to be polymorphic and 15 found to be monomorphic. The average number of alleles per locus was 1.8. The similarity coefficient ranged from 0.56 to 1.00 with high dissimilarity coefficient of 0.44 for the genotypes TCH 1777 with MCU 13 and TSH 0499 with SVPR 4.

7p trinhthamhodang3 17-02-2020 17 1   Download

The present study aimed to estimate the general and specific combining ability variances and their effects, and extent of heterobeltiosis and economic heterosis for different quantitative characters in yellow sarson. Line × Tester analysis including 11 local germplasm lines and four testers illustrated the preponderance sca over gca for all the traits studied. Based on desirable GCA effects, PYSC-11-3, PYSC-11-36, PYSC-11-44 and PYSC-11-46 among lines and B-9 among testers were identified as promising donars for seed yield.

14p trinhthamhodang3 12-02-2020 12 0   Download

The experiment was carried out at Vegetable Research Station, Junagadh Agricultural University, Junagadh, Gujarat during rabi season of 2017-19 to study performance of nine lines and four testers into thirty-six tomato hybrids for fruit yield and its component traits by Line x Tester analysis. The analysis of variance for seventeen characters showed significant differences for all the genotypes indicating that experimental material had sufficient genetic variability for all the characters studied.

10p trinhthamhodang3 12-02-2020 16 0   Download

An experiment was undertaken by utilizing forty finger millet genotypes for eleven yield and yield contributing characters to assess genetic divergence. The analysis of variance has shown that there was significant variation among the genotypes in all the traits. The multivariate analysis carried out using Mahalanobis D2-statistics, indicated wider genetic diversity in the genotypes of finger millet.

13p chauchaungayxua3 07-02-2020 14 1   Download

The present study was conducted to determine phenotypic performance, genetic variability, heritability, genetic advance, diversity, correlation and path analysis for yield and seventeen yield attributing characters of forty five sponge gourd germplasm. PCV was higher than GCV for all the traits studied. High PCV and GCV were recorded for number of primary branches, number of fruiting nodes on main stem, sex ratio, fruits per plant and yield per plant. Thirteen characters showed high heritability coupled with high genetic advance.

13p kequaidan2 11-12-2019 39 0   Download

A study on heterosis for seed cotton yield and fibre quality traits was carried out at Agricultural Research Station, Dharwad farm during kharif 2017. The material comprised of 28 intraspecific hybrids, their parents and standard check DHH-11 which were evaluated in randomized complete block design (RCBD) with two replications. The analysis of variance indicated the presence of substantial variability among the experimental materials for yield and fibre quality traits.

6p cothumenhmong1 08-12-2019 15 0   Download

The study of heterosis would help in selection of heterotic crosses for commercial exploitation of F1 hybrids in okra (Abelmoschus esculentus (L.) Moench). 45 F1s were developed by crossing 10 elite lines of okra in half diallel fashion during summer 2016. All 45 F1s along with their 10 parents and one standard control (Nunhems hybrid Shakti) were evaluated in a randomized complete block design with three replicates during late kharif (July to October) 2016 at ICAR- Krishi Vigyan Kendra, Babbur Farm, Hiriyur, Chitradurga, Karnataka, India, for heterosis of yield and its components of okra.

15p chauchaungayxua1 04-12-2019 49 1   Download