Genetic Studies Involving Inter-Plant Type Crosses in Cotton (Gossypium hirsutum L.)
KrishiKosh
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Title |
Genetic Studies Involving Inter-Plant Type Crosses in Cotton (Gossypium hirsutum L.)
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Creator |
Ranganatha H.M.
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Contributor |
S.S. Patil
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Subject |
Genetics and Plant Breeding
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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. |
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Date |
2016-11-10T17:08:38Z
2016-11-10T17:08:38Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/84984
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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