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Genetic variability studies in field bean (Lablab purpureus L. sweet)

KrishiKosh

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Title Genetic variability studies in field bean (Lablab purpureus L. sweet)
 
Creator Avinalappa H.Hotti
 
Contributor V.Rudranaik
 
Subject Genetics and Plant Breeding
 
Description Field investigation with fifteen genotypes was carried out to study the genetic
variability during 2008-09. The second experiment was conducted to estimate the heterosis,
combining ability of parents and hybrids. The hybrids were obtained by crossing six lines
with three testers in line x tester fashion. Eighteen F1s, six lines, three testers and two checks
viz., HA3 and local avare were evaluated during 2009-10.
The genetic parameters viz., PCV, GCV, heritability and genetic advance were found
to be highly significant for inflorescence length, number of inflorescence per plant, number
of pods per plant and seed yield per plant indicating the existence of wide range of genetic
variability in the material evaluated. The correlation studies revealed strong positive
association of yield with number of inflorescence per plant and number of pods per plant.
Path coefficient analysis revealed that number of secondary branches per plant had highest
positive direct effect on seed yield.
The higher magnitude of SCA variance was observed for all the characters compared
to GCA variance. Hence, the ratio of GCA variance to SCA variance was lesser than unity for
all the traits except number of pods per plant. DA-12 was the best general combiner for
number of pods per plant, protein content and seed yield per plant. The cross combinations
DA-8 x DA-14, DA-11 x DA-15, DA-12 x DA-14 and DA-12 x DA-15 were found to be
promising for seed yield as they had high positive standard heterosis.
Genotypes were also screened for pest and disease. Two genotypes viz., DA-6 and
DA-14 showed resistant reaction to pod borer. While, DA-1 and DA-9 and crosses viz., DA-
11 x DA-13, DA-11 x DA-14 and DA-12 x DA-14 showed resistant reaction to Anthracnose
disease.
 
Date 2016-11-10T13:43:33Z
2016-11-10T13:43:33Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84852
 
Format application/pdf
 
Publisher UAS, Dharwad