Abstract
As drought and heat stress are major challenges for crop productivity under future climate changes, tolerant cultivars are highly in demand. This study investigated the potential of existing Nordic wheat genotypes to resist unfavorable conditions. Four genotypes were selected based on their heat sensitivity (heat-sensitive: LM19, SF1; heat-tolerant: LM62, NS3). At the tillering stage, the plants were subjected to four treatments under controlled conditions: control, drought, heat and combined drought and heat stress. The morpho-physiological performance was quantified during the early and late phase of stress, as well as the recovery phase. We applied an integrative image-based phenotyping approach monitoring plant growth dynamics by structural Red Green Blue (RGB) imaging, photosynthetic performance by chlorophyll fluorescence imaging and transpiration efficiency by thermal infrared imaging. The results demonstrated that the selected genotypes were moderately affected in their photosynthetic efficiency and growth under drought stress, whereas heat and combined stress caused rapid reductions in photosynthesis and growth. Furthermore, drought stress had a major impact on canopy temperature. The NS3 genotype was the most robust genotype, as indicated by its improved response under all stress treatments due to its relatively small biomass. However, the genotypes showed different tolerance to individual and combined stress.
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Claims 6
Claim · model-written summary
Drought moderately affected photosynthetic efficiency and growth.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- drought stresse0
- Outcome
- photosynthetic efficiency and growthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“selected genotypes were moderately affected in their photosynthetic efficiency and growth under drought stress”
t0“Wheat”
Claim · model-written summary
Heat rapidly reduced photosynthesis and growth.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- heate0
- Outcome
- photosynthesis and growthe0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat and combined stress caused rapid reductions in photosynthesis and growth”
t0“Wheat”
Claim · model-written summary
Combined drought and heat rapidly reduced photosynthesis and growth.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- combined stresse0
- Outcome
- photosynthesis and growthe0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat and combined stress caused rapid reductions in photosynthesis and growth”
t0“Wheat”
Claim · model-written summary
Drought strongly affected canopy temperature.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- drought stresse0
- Outcome
- canopy temperaturee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress had a major impact on canopy temperature”
t0“Wheat”
Claim · model-written summary
NS3 was the most robust genotype under all stress treatments.
- Taxon
- wheatTriticum aestivumt0
- Material
- NS3e0
- Outcome
- most robust genotypee0
- Direction
- improvede0
- Qualifier
- relatively small biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NS3 genotype was the most robust genotype, as indicated by its improved response under all stress treatments due to its relatively small biomass”
t0“Wheat”
Claim · model-written summary
Genotypes differed in tolerance to individual and combined stress.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- tolerance to individual and combined stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the genotypes showed different tolerance to individual and combined stress”
t0“Wheat”
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