Evaluation of five peanut (Arachis hypogaea) genotypes to identify drought responsive mechanisms utilising candidate-gene approach
Phat M. Dang A D , Charles Y. Chen B and C. Corley Holbrook C
+ Author Affiliations
- Author Affiliations
A USDA-ARS, National Peanut Research Laboratory, PO Box 509, 1011 Forrester Dr SE, Dawson, GA 39842, USA.
B Department of Agronomy and Soil Sciences, Auburn University, 201 Funchess Hall, Auburn, AL 36849, USA.
C USDA-ARS, Crop Genetics and Breeding Research Unit, 115 Coastal Way, Tifton, GA 31793, USA.
D Corresponding author. Email: phat.dang@ars.usda.gov
This paper originates from a presentation at the ‘VI International Conference on Legume Genetics and Genomics (ICLGG)’ Hyderabad, India, 2–7 October 2012.
Functional Plant Biology 40(12) 1323-1333 https://doi.org/10.1071/FP13116
Submitted: 24 April 2013 Accepted: 5 August 2013 Published: 13 September 2013
Abstract
Drought can significantly limit yield and quality in peanut (Arachis hypogaea L.), depending on its timing, duration and severity. The objective of this study was to identify potential molecular mechanism(s) utilising a candidate-gene approach in five peanut genotypes with contrasting drought responses. An early season drought stress treatment was applied under environmentally controlled rain-out shelters. When water was completely withheld for 3 weeks, no physical differences were observed for treated plants compared with their fully irrigated counterparts as indicated by relative water content; however, yield, grades (total sound mature kernel, TSMK), specific leaf area, and leaf dry matter content showed significant differences. Comparing expression levels of candidate genes, ‘C76–16’ exhibited significantly higher levels for CuZnSOD, NsLTP and drought protein 1 week earlier compared to the other genotypes, followed by significantly lower levels for the same genes. This suggested an early recognition of drought in C76–16 followed by an acclimation response. Cultivar ‘Georgia Green’ showed different patterns of gene-expression than C76–16. AP-3, a susceptible genotype, showed generally lower levels of gene-expression than C76–16 and Georgia Green. Myo-inositol phosphate synthase gene-expression showed high levels in irrigated treatment, ranging from 4-fold for 08T-12 to 12-fold for Georgia Green, but were significantly inhibited in drought treatment after 2 weeks of drought and after recovery.
Additional keywords: abiotic stress, breeding, gene-expression.
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