4.6 Article

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

期刊

NEW PHYTOLOGIST
卷 232, 期 1, 页码 162-175

出版社

WILEY
DOI: 10.1111/nph.17563

关键词

growth stage; nocturnal conductance; stomata; Triticum aestivum; water-use efficiency

资金

  1. UK-Mexico grant from the Newton Fund
  2. Biotechnology and Biological Sciences Research Council [BB/S012834/1]
  3. Nottingham BBSRC Doctoral Training Programme
  4. BBSRC [BB/R004633/1] Funding Source: UKRI

向作者/读者索取更多资源

Nocturnal stomatal conductance (g(sn)) is a significant source of water loss, with variations in magnitude and responses across different wheat genotypes. Higher g(sn) in the wild relative was associated with lower nocturnal respiration and higher daytime CO2 assimilation, while both species exhibited declines in g(sn) post-dusk and pre-dawn. The intraspecific variation in g(sn) and its correlation with daytime stomatal conductance (g(s)) present opportunities for exploiting intrinsic variation under heat or water stressed conditions.
Nocturnal stomatal conductance (g(sn)) 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 g(sn) in major crops. We assessed interspecific variation in g(sn) and daytime stomatal conductance (g(s)) 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 g(sn) in the wild relative was associated with significantly lower nocturnal respiration and higher daytime CO2 assimilation while both species exhibited declines in g(sn) post-dusk and pre-dawn. Lifetime g(sn) achieved rates of 5.7-18.9% of g(s). Magnitude of g(sn) was genotype specific 'and positively correlated with g(s). g(sn) and g(s) were significantly higher on the adaxial surface. No relationship was determined between harvest characteristics, stomatal morphology and g(sn), while cuticular conductance was genotype specific. Finally, for the majority of genotypes, g(sn) declined with age. Here we present the discovery that variation in g(sn) occurs across developmental, morphological and temporal scales in nonstressed wheat, presenting opportunities for exploiting intrinsic variation under heat or water stressed conditions.

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