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Genetic Studies in Gossypium barbadense L. Cotton for Productivity

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Title Genetic Studies in Gossypium barbadense L. Cotton for Productivity
 
Creator Deepika M.
 
Contributor S.S. Patil
 
Subject Genetics and Plant Breeding
 
Description Gossypium barbadense species of cotton proved to be better in quality but
poorer in yield compared to other cotton species, the present study was undertaken for
evaluating intra barbadense F1s and varieties aiming at better yield and better pollen
germination.
Four intra barbadense crosses and six generations (P1, P2, F1, F2, B1 and B2) of
each cross were subjected to generation mean analysis. Results showed that majority
of the traits were influenced by non- additive gene action and the crosses exhibited
heterosis and heterobeltosis for yield and important yield attributing traits such as
number of bolls, boll weight, lint yield and number of sympodia. Cross RAB 531 x
RAB 533 with highest magnitude of dominance and highest per cent mid parent
heterosis of 26.4 per cent for seed cotton yield.
Heterosis and Combining ability studies for yield characters in twenty four
barbadense F1s were carried out. None of the F1s surpassed the commercial check
DCH-32 in yield and it is noted that among the four testers studied RAB 533 appeared
to be the best general combiner and among the six lines PIMA 54 appeared to the best
general combiner. Cross ICB 181 x RAB 533 had significant positive heterosis of
30.67 per cent over mid parent.
Variability studies in eighteen three way cross F1s were taken up and was
observed that higher heritability coupled with high genetic advance was noticed in
seed cotton yield and plant height which gives an indication of predominance of
additive genetic effects in controlling the character.
A basic pollen germination study was taken up in twenty four barbadense F1s
and their parents. The parents and hybrids showed significant differences with respect
to the pollen germination percentage. Crosses RAB 532 x USA 206, RAB 531 x USA
788, RAB 532 x USA 788 had better per cent pollen germination over standard check
DCH 32.
 
Date 2016-11-10T16:23:37Z
2016-11-10T16:23:37Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84954
 
Format application/pdf
 
Publisher UAS, Dharwad