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Genetic Studies Involving Inter-Plant Type Crosses in Cotton (Gossypium hirsutum L.)

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Title Genetic Studies Involving Inter-Plant Type Crosses in Cotton (Gossypium hirsutum L.)
 
Creator Ranganatha H.M.
 
Contributor S.S. Patil
 
Subject Genetics and Plant Breeding
 
Description Cotton is one of the most important commercial crops which has occupied
importance from historic days. To increase productivity of hybrids there is a need for
identifying and exploiting genetic diversity available in cotton in terms of contrasting
plant type traits. The nine robust types are crossed with six compact types in a Line x
Tester fashion to develop inter plant type crosses so as to combine the desirable
features of compact plant types on the framework of robust plant types and were
evaluated for potentiality and plant type traits in F1s as influenced by their diverse
parents.
Combining ability analysis revealed that estimates of SCA variances were of
greater magnitude than GCA variances for majority of the traits. The parents RAH
100, RAH 101, RAMPBS 155 and RACH 226 were the potential combiners based on
the gca effects. Among crosses tested, RAH 101 x RACH 226 and RAMPBS 155 x
RACH 16 recorded higher seed cotton yield. Most of the crosses were potential, this
is because of blending of ideal features of both robust and compact lines, such as
utilization of additional three dimensional space of robust and efficient packing of
bolls as observed in compact plant types. Four F2 populations were studied for
comparing the variability among inter and intra group crosses of cotton.
Based on prediction of the double cross performance of genotypes, (RAH-101
x RACH-226) x (RAMPBS-155 x RACH-16) is the best combination of genetically
diverse single crosses and since they have significant gca and sca effects, they can be
utilized in initiating Reciprocal selection for combining ability.
Estimation of genetic correlation among different quantitative characters was
done and these were compared with genotypic and phenotypic correlations. At the
breeding level, seed cotton yield exhibited highest positive genetic correlation with
number of bolls per plant, boll weight and other traits.
 
Date 2016-11-10T17:08:38Z
2016-11-10T17:08:38Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84984
 
Format application/pdf
 
Publisher UAS, Dharwad