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Maize, sorghum, and pearl millet have highly contrasting species strategies to adapt to water stress and climate change-like conditions. | LitMetric

Maize, sorghum, and pearl millet have highly contrasting species strategies to adapt to water stress and climate change-like conditions.

Plant Sci

International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502 324, Telangana, India; Institut de Recherche pour le Développement (IRD), UMR DIADE, Univ. Montpellier, 911 Av Agropolis BP65401, 34394, Montpellier, France. Electronic address:

Published: June 2020

AI Article Synopsis

Article Abstract

This study compared maize, sorghum and pearl-millet, leading C cereals, for the transpiration rate (TR) response to increasing atmospheric and soil water stress. The TR response to transiently increasing VPD (0.9-4.1 kPa) and the transpiration and leaf area expansion response to progressive soil drying were measured in controlled conditions at early vegetative stage in 10-16 genotypes of each species grown in moderate or high vapor pressure deficit (VPD) conditions. Maize grown under moderate VPD conditions restricted TR under high VPD, but not sorghum and pearl millet. By contrast, when grown under high VPD, all species increased TR upon increasing VPD, suggesting a loss of TR responsiveness. Sorghum and pearl-millet grown under high VPD reduced leaf area, but not maize. Upon progressive soil drying, maize reduced transpiration at higher soil moisture than sorghum and pearl millet, especially under high VPD, and leaf area expansion declined at similar or lower soil moisture than transpiration in maize and sorghum. It is concluded that maize conserves water by restricting transpiration upon increasing VPD and under higher soil moisture than sorghum and millet, giving maize significantly higher TE, whereas sorghum and pearl millet rely mostly on reduced leaf area and somewhat on transpiration restriction.

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Source
http://dx.doi.org/10.1016/j.plantsci.2019.110297DOI Listing

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