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Nocturnal stomatal conductance in wheat is growth-stage specific and shows genotypic variation

Creator: McAusland, L.
Creator: Smith, K.E.
Creator: Williams, A.
Creator: Molero, G.
Creator: Murchie, E.
Year: 2021
URI: https://hdl.handle.net/10883/21602
Language: English
Publisher: Wiley
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose
Type: Article
Place of Publication: United Kingdom
Pages: 162-175
Issue: 1
Volume: 232
DOI: 10.1111/nph.17563
Keywords: Growth Stage
Keywords: Nocturnal Conductance
Description: Nocturnal stomatal conductance (gsn) represents a significant source of water loss, with implications for metabolism, thermal regulation and water-use efficiency. With increasing nocturnal temperatures due to climate change, it is vital to identify and understand variation in the magnitude and responses of gsn in major crops. We assessed interspecific variation in gsn and daytime stomatal conductance (gs) in a wild relative and modern spring wheat genotype. To investigate intraspecific variation, we grew six modern wheat genotypes and two landraces under well watered, simulated field conditions. For the diurnal data, higher gsn in the wild relative was associated with significantly lower nocturnal respiration and higher daytime CO2 assimilation while both species exhibited declines in gsn post-dusk and pre-dawn. Lifetime gsn achieved rates of 5.7–18.9% of gs. Magnitude of gsn was genotype specific 'and positively correlated with gs. gsn and gs were significantly higher on the adaxial surface. No relationship was determined between harvest characteristics, stomatal morphology and gsn, while cuticular conductance was genotype specific. Finally, for the majority of genotypes, gsn declined with age. Here we present the discovery that variation in gsn occurs across developmental, morphological and temporal scales in nonstressed wheat, presenting opportunities for exploiting intrinsic variation under heat or water stressed conditions.
Agrovoc: DEVELOPMENTAL STAGES
Agrovoc: STOMATA
Agrovoc: TRITICUM AESTIVUM
Agrovoc: WATER USE EFFICIENCY
Related Datasets: https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.17563#support-information-section
ISSN: 1469-8137
Journal: New Phytologist


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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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