Abstract
Summary 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.
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Claims 6
Claim · model-written summary
Night heating lowered grain yield by 1.9% per 1°C.
- Taxon
- Triticum aestivum
Triticum aestivume1 - Treatment
- nocturnal heatinge0
- Outcome
- grain yieldse0
- Direction
- decreasede0
- Value
- 1.9% per 1°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under nocturnal heating, grain yields decreased (1.9% per 1°C)”
e1“Triticum aestivum”
Claim · model-written summary
Night heating did not significantly change daytime leaf physiology.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- nocturnal heatinge0
- Outcome
- daytime leaf‐level physiological responsese0
- Direction
- without significant changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under nocturnal heating, grain yields decreased (1.9% per 1°C) without significant changes in daytime leaf‐level physiological responses”
e1“Triticum aestivum”
Claim · model-written summary
Warmer nights significantly decreased nocturnal stomatal conductance.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- warmer nightse0
- Outcome
- g sne0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under warmer nights, there were significant differences in the magnitude and decrease in g sn”
e1“Triticum aestivum”
Claim · model-written summary
Nocturnal stomatal conductance was 9 to 33% of daytime rates.
- Taxon
- Triticum aestivumTriticum aestivume1
- Outcome
- g sne0
- Value
- between 9 and 33% of daytime ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
e1“Triticum aestivum”
Claim · model-written summary
Respiration appeared to acclimate to higher temperatures.
- Taxon
- Triticum aestivumTriticum aestivume1
- Outcome
- respiratione0
- Qualifier
- appeared to acclimate to higher temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“respiration appeared to acclimate to higher temperatures”
e1“Triticum aestivum”
Claim · model-written summary
Yield declines under warmer nights varied by genotype, with heat tolerant genotypes among the largest declines.
- Taxon
- Triticum aestivumTriticum aestivume1
- Material
- genotypes categorised as heat tolerante0
- Treatment
- warmer nightse0
- Outcome
- grain yielde0
- Direction
- declinese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
e1“Triticum aestivum”
The same questions in other papers
heat · yield · Triticum aestivum (wheat)Positive and negative results
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