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Reciprocal selection for improving combing ability in cotton

KrishiKosh

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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