Phenotypic Evaluation of Groundnut Germplasm under Drought and Heat Stress

Hamidou, F and Vadez, V (2012) Phenotypic Evaluation of Groundnut Germplasm under Drought and Heat Stress. In: Proceedings of CORAF/WECARD 3rd Agricultural Science Week and 10th General Assembly, 14 to 17 May 2012, Ndjamena, Chad.

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Abstract

A groundnut germplasm (268 genotypes) was evaluated in four trials over a period of two years, under intermittent drought and fully irrigated conditions. Two trials were exposed to moderate temperature during the rainy season while the two others were subjected to high temperature during summer. The objectives were to segregate the components of the genetic variance and their interactions with water treatment, year and environment (temperature) for agronomic characteristics so as to select high yielding genotypes under hot conditions and to identify traits putatively related to heat and/or intermittent drought tolerance. Under high temperature conditions, drought stress reduced pod yield up to 72% compared to 55% at moderate temperature. The haulm yield decrease due to drought was 34% at high temperature and 42% under moderate temperature. Haulm yield tended to increase under high temperature. For the three traits, genotype by environment interaction (GxE) was significant under well-watered (WW) and water stressed (WS) treatments. The genotype and genotype by environment (GGE) biplots analyses revealed several mega environments under WW and WS treatments indicating that high yielding genotypes under moderate temperature were different from those at high temperature. The GGE biplots analyses also revealed several genotypes with high performance and stability across year and temperature environments under both WW and WS conditions. Regression analyses indicated that among several traits measured during plant growth, only the partition rate was significantly correlated to pod yield suggesting that this trait was contributing to heat and drought tolerance and could be a reliable selection criterion for groundnut breeding program for this stress.

Item Type: Conference or Workshop Item (Paper)
Divisions: UNSPECIFIED
CRPS: UNSPECIFIED
Uncontrolled Keywords: High temperature; Genotype-x-Environment interaction; yield; harvest index, reproduction, groundnut
Subjects: Mandate crops > Groundnut
Others > Genetics and Genomics
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 28 Jan 2013 04:12
Last Modified: 14 Sep 2013 12:06
URI: http://oar.icrisat.org/id/eprint/6458
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