Heritability and Genetic Relationships for Drought-Related Traits in Peanut

Chen, C.Y. and Nuti, R.C. and Rowland, D.L. and et al, . (2013) Heritability and Genetic Relationships for Drought-Related Traits in Peanut. Crop Science, 53 (4). pp. 1392-1402.

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Water-use efficiency is often genetically correlated with specific leaf area (SLA) and leaf C isotopic composition (d13C) in peanut (Arachis hypogaea L.). The objectives of this study were to examine the effects of environment, genotype, and genotype × environment interaction on SLA, d13C, harvest index (HI), and yield and to estimate heritability and the genetic relationships. Fifteen genotypes were tested at two locations with different drought intensities for 2 yr. The additive main effects and multiplicative interaction analysis based on yield data divided eight environments (locations × treatments × years) into four clusters, which reflected a gradient in drought stress, indicating yield trait is a good indication of drought stress. The genotype Exp8-12 was identified as a best drought tolerant germplasm across environments. Heritability estimates for HI (0.68 to 0.89) and d13C (0.75 to 0.89) were higher than those for SLA (0.31 to 0.88) and yield (0.12 to 0.65). A positive but small genetic correlation coefficient (rg) (0.26) was found between HI and yield, and low to moderate rg (0.14 to 0.55) were observed between HI and SLA. A relative high negative genetic correlation rg (-0.81 to -0.57) was found between d13C and yield. In theory, the high heritability and no G×E interaction for d13C make it possible a surrogate that can be used to assess drought tolerance in peanut breeding.

Item Type: Article
Additional Information: We would like to thank Dr. Ron Sorensen at USDA-ARS National Peanut Research Laboratory for dedicated assistance with collecting the weather data at Dawson, GA. We are indebted to Brian Gamble and Larry Wells for devoted assistance with management of field experiment research plots at the Wiregrass Research and Extension Center, Auburn University, Headland, AL. Thanks also to Robert Tennille, Sam Hilton, and other personnel from the laboratory for assistance with experimental aspects associated with this research.
Author Affiliation: Dep. of Agronomy and Soil Sciences, Auburn Univ., Auburn, AL 36849
Subjects: Crop Improvement > Genetics/Genomics
Divisions: Groundnut
Depositing User: Mr Siva Shankar
Date Deposited: 28 Oct 2013 05:45
Last Modified: 28 Oct 2013 05:45
Official URL: http://dx.doi.org/10.2135/cropsci2012.07.0426
URI: http://eprints.icrisat.ac.in/id/eprint/12046

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