Reciprocal selection for improving combing ability in cotton
KrishiKosh
View Archive InfoField | Value | |
Title |
Reciprocal selection for improving combing ability in cotton
|
|
Creator |
V.Ramakrishna
|
|
Contributor |
S.S.Patil
|
|
Subject |
Genetic Plant Breeding
|
|
Description |
The main objective of the present study was to extend reciprocal selection for improving combining ability to cotton by altering its procedure to suit mating system of cotton. With the help of diallel study involving seven single crosses, best double cross combination, RAHH-198 x ZCH-21405 was identified. These opposite F1s were used as base populations and they were advanced to F4. Twenty four F4 lines from each of these opposite populations were crossed reciprocally to the opposite F1s. Additionally these two sets of F4 lines were crossed to four diverse testers (Two L x T sets of 24 x 5 crosses). The magnitude of variability for combining ability was assessed based on mean, variance and CV of seed cotton yield in derived F1s (F4s x testers) in comparison with corresponding bench mark cross (base F1s x testers). Derived F1s revealed increase in variability for seed cotton yield. Many of the derived F1s were superior over bench mark cross and common check (Bunny) as well. These lines are inferred to be improved for ability to combine with tester as compared to base F1s. Based on performance of derived F1s, top four lines from opposite populations were selected as elite lines for obtaining potential crosses. Among F4 lines, R-13 (198) and R-1(ZCH) lines showed highest improvement in combining ability for seed cotton yield. Some of the F4 lines also combined well with additional testers confirming their general practical utility in hybrid breeding. Based on weighted per cent gca method F4 lines with higher pooled scores were identified. Testers were compared for their efficiency in distinguishing F4 lines of the populations. |
|
Date |
2016-07-23T09:04:01Z
2016-07-23T09:04:01Z 2008 |
|
Type |
Thesis
|
|
Identifier |
http://krishikosh.egranth.ac.in/handle/1/69449
|
|
Format |
application/pdf
|
|
Publisher |
UAS Dharwad
|
|