Assessment of Groundnut under Combined Heat and Drought Stress

Hamidou, F and Halilou, O and Vadez, V (2013) Assessment of Groundnut under Combined Heat and Drought Stress. Journal of Agronomy and Crop Science, 199 (1). pp. 1-11. ISSN 1439-037X

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In semi-arid regions, particularly in the Sahel, water and high-temperature stress are serious constraints for groundnut production. Understanding of combined effects of heat and drought on physiological traits, yield and its attributes is of special significance for improving groundnut productivity. Two hundred and sixty-eight groundnut genotypes were evaluated in four trials under both intermittent drought and fully irrigated conditions, two of the trial being exposed to moderate temperature, while the two other trials were exposed to high temperature. The objectives were to analyse the component of the genetic variance and their interactions with water treatment, year and environment (temperature) for agronomic characteristics, to select genotypes with high pod yield under hot- and moderate-temperature conditions, or both, and to identify traits conferring heat and/or drought tolerance. Strong effects of water treatment (Trt), genotype (G) and genotype-by-treatment (GxTrt) interaction were observed for pod yield (Py), haulm yield (Hy) and harvest index (HI). The pod yield decrease caused by drought stress was 72 % at high temperature and 55 % at moderate temperature. Pod yield under well-watered (WW) conditions did not decrease under high-temperature conditions. Haulm yield decrease caused by water stress (WS) was 34 % at high temperature and 42 % under moderate temperature. Haulm yield tended to increase under high temperature, especially in one season. A significant year effect and genotype-by-environment interaction (GxE) effect were also observed for the three traits under WW and WS treatments. The GGE biplots confirmed these large interactions and indicated that high yielding genotypes under moderate temperature were different to those at high temperature. However, several genotypes with relatively high yield across years and temperature environments could be identified under both WW and WS conditions. Correlation analysis between pod weight and traits measured during plant growth showed that the partition rate, that is, the proportion of dry matter partitioned into pods, was contributing in heat and drought tolerance and could be a reliable selection criterion for groundnut breeding programme. Groundnut sensitivity to high-temperature stress was in part related to the sensitivity of reproduction.

Item Type: Article
Uncontrolled Keywords: GxE interaction; harvest index; high temperature; mega environment, reproduction; yield
Subjects: Mandate crops > Groundnut
Depositing User: Mr Siva Shankar
Date Deposited: 01 Jun 2012 05:16
Last Modified: 20 Sep 2013 06:25
Official URL:
Projects: Tropical Legume I Project
Funders: Bill and Melinda Gates Foundation
Acknowledgement: The work was supported by a grant from the Bill and Melinda Gates Foundation (Tropical Legume I project) through the Generation Challenge Program managed by CIMMYT. Authors are grateful to Boulama K Taya for expert field assistance in Niger.
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