Combining ability study in rice (Oryza sativa L.) under temperate conditions of Kashmir
Thirty intervarietal (15 indica x indica and 15 japonica x japonica) and fifteen inter-subspecific (indica x japonica) crossesgenerated through half diallel and line x tester mating were subjected to combining ability analysis for various morphoagronomictraits. The analysis of variance for combining...
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| Format: | Article |
| Language: | English |
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Indian Society of Plant Breeders
2011-03-01
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| Series: | Electronic Journal of Plant Breeding |
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| Online Access: | http://sites.google.com/site/ejpb2011/vol-2-1/Vol-2-1-31-40.pdf?attredirects=0 |
| _version_ | 1819204080313040896 |
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| author | S. Najeeb, M .A. Zargar , A. G. Rather, F. A. Sheikh, M. A. Ahanger, and M. H. Razvi |
| author_facet | S. Najeeb, M .A. Zargar , A. G. Rather, F. A. Sheikh, M. A. Ahanger, and M. H. Razvi |
| author_sort | S. Najeeb, M .A. Zargar , A. G. Rather, F. A. Sheikh, M. A. Ahanger, and M. H. Razvi |
| collection | DOAJ |
| description | Thirty intervarietal (15 indica x indica and 15 japonica x japonica) and fifteen inter-subspecific (indica x japonica) crossesgenerated through half diallel and line x tester mating were subjected to combining ability analysis for various morphoagronomictraits. The analysis of variance for combining ability revealed that variance estimates due to sca were higher inmagnitude than the corresponding gca variances resulting in relatively higher non additive variance for most of the charactersexcept for days to 50% flowering, days to maturity and grain yield/plant. The genetic components of variance revealed relativelyhigher estimates due to dominance deviation than corresponding estimates of additive genetic variance for most of the charactersexcept for aforementioned characters. Average degree of dominance was in the range over dominance for most of the yieldcomponents and other traits, however maturity traits and grain yield/plant displayed partial dominance. None of the parents couldbe identified to possess good gca effects for all the attributes, however the parents P1 (Jehlum), P3 (SR-1), P8 (K-332), P11(Kohsar) and P12 (K-508) were found promising combiners for most of the traits. For grain yield/plant cross combinations P1 xP5, P1 x P2, P4 x P6, P8 x P11, P11 x P12 and for early maturity P4 x P6, P1 x P5, P1 x P2, P11 x P12 and L4 x T2demonstrated desirable and significant sca effects. Hybridization of parents with good gca effects has an ample scope of throwingpromising transgressive segregants in the segregating generations to be used as commercial varieties. Similarly, crosscombinations with favourable sca effects and high per se performance, besides involving good combining parents can be handledthrough conventional breeding programmes. In addition, desirable characters across the two sub species can be combined toderive ideal genotypes for temperate agro ecosystems within an altitude range of 5000-7500 feet amsl. |
| first_indexed | 2024-12-23T04:30:07Z |
| format | Article |
| id | doaj.art-dbf62d7735c1431b813a93a1e6cbbdd1 |
| institution | Directory Open Access Journal |
| issn | 0975-928X |
| language | English |
| last_indexed | 2024-12-23T04:30:07Z |
| publishDate | 2011-03-01 |
| publisher | Indian Society of Plant Breeders |
| record_format | Article |
| series | Electronic Journal of Plant Breeding |
| spelling | doaj.art-dbf62d7735c1431b813a93a1e6cbbdd12022-12-21T18:00:04ZengIndian Society of Plant BreedersElectronic Journal of Plant Breeding0975-928X2011-03-01213140Combining ability study in rice (Oryza sativa L.) under temperate conditions of KashmirS. Najeeb, M .A. Zargar , A. G. Rather, F. A. Sheikh, M. A. Ahanger, and M. H. RazviThirty intervarietal (15 indica x indica and 15 japonica x japonica) and fifteen inter-subspecific (indica x japonica) crossesgenerated through half diallel and line x tester mating were subjected to combining ability analysis for various morphoagronomictraits. The analysis of variance for combining ability revealed that variance estimates due to sca were higher inmagnitude than the corresponding gca variances resulting in relatively higher non additive variance for most of the charactersexcept for days to 50% flowering, days to maturity and grain yield/plant. The genetic components of variance revealed relativelyhigher estimates due to dominance deviation than corresponding estimates of additive genetic variance for most of the charactersexcept for aforementioned characters. Average degree of dominance was in the range over dominance for most of the yieldcomponents and other traits, however maturity traits and grain yield/plant displayed partial dominance. None of the parents couldbe identified to possess good gca effects for all the attributes, however the parents P1 (Jehlum), P3 (SR-1), P8 (K-332), P11(Kohsar) and P12 (K-508) were found promising combiners for most of the traits. For grain yield/plant cross combinations P1 xP5, P1 x P2, P4 x P6, P8 x P11, P11 x P12 and for early maturity P4 x P6, P1 x P5, P1 x P2, P11 x P12 and L4 x T2demonstrated desirable and significant sca effects. Hybridization of parents with good gca effects has an ample scope of throwingpromising transgressive segregants in the segregating generations to be used as commercial varieties. Similarly, crosscombinations with favourable sca effects and high per se performance, besides involving good combining parents can be handledthrough conventional breeding programmes. In addition, desirable characters across the two sub species can be combined toderive ideal genotypes for temperate agro ecosystems within an altitude range of 5000-7500 feet amsl.http://sites.google.com/site/ejpb2011/vol-2-1/Vol-2-1-31-40.pdf?attredirects=0Rice (Oryza sativa L.)gcascatemperate ecology |
| spellingShingle | S. Najeeb, M .A. Zargar , A. G. Rather, F. A. Sheikh, M. A. Ahanger, and M. H. Razvi Combining ability study in rice (Oryza sativa L.) under temperate conditions of Kashmir Electronic Journal of Plant Breeding Rice (Oryza sativa L.) gca sca temperate ecology |
| title | Combining ability study in rice (Oryza sativa L.) under temperate conditions of Kashmir |
| title_full | Combining ability study in rice (Oryza sativa L.) under temperate conditions of Kashmir |
| title_fullStr | Combining ability study in rice (Oryza sativa L.) under temperate conditions of Kashmir |
| title_full_unstemmed | Combining ability study in rice (Oryza sativa L.) under temperate conditions of Kashmir |
| title_short | Combining ability study in rice (Oryza sativa L.) under temperate conditions of Kashmir |
| title_sort | combining ability study in rice oryza sativa l under temperate conditions of kashmir |
| topic | Rice (Oryza sativa L.) gca sca temperate ecology |
| url | http://sites.google.com/site/ejpb2011/vol-2-1/Vol-2-1-31-40.pdf?attredirects=0 |
| work_keys_str_mv | AT snajeebmazargaragratherfasheikhmaahangerandmhrazvi combiningabilitystudyinriceoryzasativalundertemperateconditionsofkashmir |