Journal
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
Volume 46, Issue 22, Pages 2837-2846Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00103624.2015.1103252
Keywords
Arsenic in soils; mycorrhiza; soybean; wilting point
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Funding
- University of Buenos Aires [UBACyT 2011-2014 068/2011]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) [PIP 0148]
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Soybean (Glycine max L.) cropping is increasing in marginal environments, including water-limited lands, some of which are loaded with arsenic (As). Plants inoculated with mycorrhiza increased their tolerance to water stress. We studied the effect of a sudden and severe water stress on soybean inoculated with the mycorrhizal fungus Glomus intraradices in soils with increasing concentrations of As. Soybean plants were grown in greenhouse with adequate water supply for 60days. Irrigation was stopped completely and soil abruptly reached the permanent wilting point. Most inoculated plants survived under such limiting water stress, but noninoculated plants were clearly affected. Arsenic showed a negative effect on plant growth but improved plant survival under this severe water stress. It seems that the negative effects of As on plant water equilibrium explain why plants affected by As survived extreme water stress events.
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