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Epistasis for Vegetative and Reproductive Traits in Peanut

OAR@ICRISAT

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Relation http://oar.icrisat.org/1171/
http://dx.doi.org/10.2135/cropsci1998.0011183X003800010008x
 
Title Epistasis for Vegetative and Reproductive Traits in Peanut
 
Creator Upadhyaya, H D
Nigam, S N
 
Subject Groundnut
 
Description Most genetic models assume absence of epistasis while estimating
components of genetic variation. However, epistasis when present
introduces bias. These biased estimates affect the progress in a breeding
program since they influence the choice of breeding methodology.
The objectives of this study were to determine the significance of
epistasis in the inheritance of pod yield and related traits in 15 peanut
(Arachis hypogaea L.) cultigens, and to estimate the additive and
dominance variances for the traits not influenced by epistasis. Two
cultigens and their F, hybrid were each crossed to 15 cultigens from
13 countries, representing three botanical groups. The experiment was
conducted in the 1992-1993 post-rainy and 1993 rainy environments at
the ICRISAT Asia Center, Patancheru, India. The deviations were
analyzed to detect epistasis of 11 traits. Epistasis affected the expression
of eight traits in both environments. Environments interacted
more strongly with epistatic gene actions than with additive or dominance
gene actions. Expression of epistasis was influenced by genotypes
and environments, indicating the need for more genotypes and
environments for effective detection of epistasis. Evidence for additive
genetic variance and lower levels of partial dominance for canopy
breadth and additive and dominance variances and complete dominance
for shelling outturn was obtained in the post-rainy environment.
 
Date 1998
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/1171/1/snnto6.pdf
Upadhyaya, H D and Nigam, S N (1998) Epistasis for Vegetative and Reproductive Traits in Peanut. Crop Science, 38 (1). pp. 44-49.