Night-time warming in the field reduces nocturnal stomatal conductance and grain yield but does not alter daytime physiological responses.

Autor: McAusland L; Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Leicestershire, LE12 5RD, UK., Acevedo-Siaca LG; International Maize and Wheat Improvement Centre (CIMMYT), Carretera México-Veracruz Km 45, El Batán, Texcoco, México, CP 56237, Mexico., Pinto RS; Instituto Tecnológico de Sonora (ITSON), 5 de Febrero 818 Sur, Col. Centro, Cd. Obregón, Sonora, México, CP 85000, Mexico., Pinto F; International Maize and Wheat Improvement Centre (CIMMYT), Carretera México-Veracruz Km 45, El Batán, Texcoco, México, CP 56237, Mexico., Molero G; International Maize and Wheat Improvement Centre (CIMMYT), Carretera México-Veracruz Km 45, El Batán, Texcoco, México, CP 56237, Mexico., Garatuza-Payan J; Instituto Tecnológico de Sonora (ITSON), 5 de Febrero 818 Sur, Col. Centro, Cd. Obregón, Sonora, México, CP 85000, Mexico., Reynolds MP; International Maize and Wheat Improvement Centre (CIMMYT), Carretera México-Veracruz Km 45, El Batán, Texcoco, México, CP 56237, Mexico., Murchie EH; Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Leicestershire, LE12 5RD, UK., Yepez EA; Instituto Tecnológico de Sonora (ITSON), 5 de Febrero 818 Sur, Col. Centro, Cd. Obregón, Sonora, México, CP 85000, Mexico.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2023 Sep; Vol. 239 (5), pp. 1622-1636. Date of Electronic Publication: 2023 Jul 10.
DOI: 10.1111/nph.19075
Abstrakt: Global nocturnal temperatures are rising more rapidly than daytime temperatures and have a large effect on crop productivity. In particular, stomatal conductance at night (g sn ) is surprisingly poorly understood and has not been investigated despite constituting a significant proportion of overall canopy water loss. Here, we present the results of 3 yr of field data using 12 spring Triticum aestivum genotypes which were grown in NW Mexico and subjected to an artificial increase in night-time temperatures of 2°C. Under nocturnal heating, grain yields decreased (1.9% per 1°C) without significant changes in daytime leaf-level physiological responses. Under warmer nights, there were significant differences in the magnitude and decrease in g sn , values of which were between 9 and 33% of daytime rates while respiration appeared to acclimate to higher temperatures. Decreases in grain yield were genotype-specific; genotypes categorised as heat tolerant demonstrated some of the greatest declines in yield in response to warmer nights. We conclude the essential components of nocturnal heat tolerance in wheat are uncoupled from resilience to daytime temperatures, raising fundamental questions for physiological breeding. Furthermore, this study discusses key physiological traits such as pollen viability, root depth and irrigation type may also play a role in genotype-specific nocturnal heat tolerance.
(© 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation.)
Databáze: MEDLINE
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