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GENETIC ANALYSIS OF LATE LEAFSPOT RESISTANCE, YIELD AND YIELD COMPONENTS IN GROUNDNUT (Arachis hypogaea L.)

KrishiKosh

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Title GENETIC ANALYSIS OF LATE LEAFSPOT RESISTANCE, YIELD AND YIELD COMPONENTS IN GROUNDNUT (Arachis hypogaea L.)
 
Creator SRIVALLI POTHULA
 
Contributor REDDI SEKHAR, M
 
Subject planting, yields, developmental stages, crossing over, groundnuts, heterosis, biological phenomena, harvesting, genetics, sowing
 
Description The experimental material used in the study consisted of eight parents and 15 F1 hybrid combinations of groundnut which were evaluated in dry land farm of S.V. Agricultural College, Tirupati during kharif, 2011 to identify the best parental genotypes and cross combinations with high pod yield potential.
The analysis of variance revealed the existence of significant differences among the genotypes for all the 14 quantitative traits studied. Among lines, TCGS-913 recorded high per se performance for pod yield per plant and TG-47 for number of mature pods per plant followed by number of primary branches per plant, harvest index and low mean values for late leafspot score at 90 days after sowing and number of leaves affected by late leafspot per plant at 90 days after sowing. Among testers, GPBD-4 recorded high per se performance for pod yield per plant followed by plant height, number of primary branches per plant, number of mature pods per plant, kernel yield per plant, per cent pod set and harvest index. Among 15 F1 crosses, TG-47 x ICG-15234 recorded high per se performance for pod yield per plant, number of mature pods per plant, kernel yield per plant and per cent pod set while, it recorded low mean for late leafspot score at 90 days after sowing.
Analysis of variance for combining ability revealed highly significant difference among the lines, testers and lines x testers for all the characters studied except number of primary branches per plant. Predominance of non-additive gene action for most the traits except number of primary branches per plant, days to 50 per cent flowering and days to maturity.
The hybrid TG47 x ICG-15234 displayed high heterosis for pod yield per plant, kernel yield per plant, per cent pod set and less late leafspot score at
xiv
90 days after sowing, whereas ICGV-91114 x ICG-13919 for number of mature pods per plant, shelling per cent and less number of leaves affected by late leafspot per plant at 90 days after sowing. The best two hybrids identified for most of the characters based on sca effects were ICGV-91114 x ICG-15234 for pod yield per plant, harvest index and less number of leaves affected by late leafspot per plant at 90 days after sowing and TCGS-913 x GPBD-4 for kernel yield per plant, per cent pod set, shelling per cent, late leafspot score at 90 DAS and number of leaves at harvest. The good general combiners identified for both late leafspot resiatance and pod yield characters were TG-47 and ICG-15234 which could be utilized in hybridization programme for further genetic improvement of traits.
A study on genetic parameters revealed that GCV and PCV were high for number of secondary branches per plant, number of leaves affected by late leafspot per plant at 90 days after sowing, kernel yield per plant, pod yield per plant, number of mature pods per plant, number of leaves at harvest and harvest index. High heritability (broad sense) was observed for all the traits. High heritability coupled with high genetic advance as per cent of mean was recorded for number of secondary branches per plant, number of leaves affected by late leafspot per plant at 90 days after sowing, kernel yield per plant, pod yield per plant, number of mature pods per plant, number of leaves at harvest, harvest index, late leafspot score at 90 days after sowing and plant height indicating the additive gene effects in the genetic control of these traits and can be improved by simple selection in the present breeding material.
Strong positive association was exhibited by the characters viz., number of mature pods per plant and kernel yield per plant, number of primary branches per plant, days to 50 per cent flowering, percent pod set, harvest index and late leafspot score at 90 days after sowing with pod yield per plant. The interse association of yield components were also observed to be significant with each other.
Path coefficient analysis revealed that number of mature pods per plant exerted the highest positive direct effect on pod yield per plant followed by kernel yield per plant and harvest index. Hence, these characters should be given due emphasis in formulating selection criterion for genetic improvement of pod yield per plant in the present genetic material.
 
Date 2016-06-17T10:08:22Z
2016-06-17T10:08:22Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67498
 
Language en
 
Relation D9355;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY