Abstract
Drought and heat are the main abiotic constraints affecting durum wheat production. This study aimed to screen for tolerance to drought, heat, and combined stresses in durum wheat, at the juvenile stage under controlled conditions. Five durum wheat genotypes, including four landraces and one improved genotype, were used to test their tolerance to abiotic stress. After 15 days of growing, treatments were applied as three drought levels (100, 50, and 25% field capacity (FC)), three heat stress levels (24, 30, and 35°C), and three combined treatments (100% FC at 24°C, 50% FC at 30°C and 25% FC at 35°C). The screening was performed using a set of morpho-physiological, and biochemical traits. The results showed that the tested stresses significantly affect all measured parameters. The dry matter content (DM) decreased by 37.1% under heat stress (35°C), by 37.3% under severe drought stress (25% FC), and by 53.2% under severe combined stress (25% FC at 35°C). Correlation analyses of drought and heat stress confirmed that aerial part length, dry matter content, hydrogen peroxide content, catalase, and Glutathione peroxidase activities could be efficient screening criteria for both stresses. The principal component analysis (PCA) showed that only the landrace Aouija tolerated the three studied stresses, while Biskri and Hedhba genotypes were tolerant to drought and heat stresses and showed the same sensitivity under combined stress. Nevertheless, improved genotype Karim and the landrace Hmira were the most affected genotypes by drought, against a minimum growth for the Hmira genotype under heat stress. The results showed that combined drought and heat stresses had a more pronounced impact than simple effects. In addition, the tolerance of durum wheat to drought and heat stresses involves several adjustments of morpho-physiological and biochemical responses, which are proportional to the stress intensity.
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Claims 10
Claim · model-written summary
Heat at 35°C decreased dry matter content by 37.1%.
- Taxon
- durum wheat
Triticum turgidum subsp. durumt0 - Treatment
- heat stress (35°C)e0
- Outcome
- dry matter content (DM)e0
- Direction
- decreasede0
- Value
- 37.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dry matter content (DM) decreased by 37.1% under heat stress (35°C)”
t0“durum wheat”
Claim · model-written summary
Severe drought decreased dry matter content by 37.3%.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Treatment
- severe drought stress (25% FC)e0
- Outcome
- dry matter contente0
- Direction
- decreasede0
- Value
- 37.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dry matter content (DM) decreased by 37.1% under heat stress (35°C), by 37.3% under severe drought stress (25% FC)”
t0“durum wheat”
Claim · model-written summary
Combined stress decreased dry matter content by 53.2%.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Treatment
- severe combined stress (25% FC at 35°C)e0
- Outcome
- dry matter contente0
- Direction
- decreasede0
- Value
- 53.2%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dry matter content (DM) decreased by 37.1% under heat stress (35°C), by 37.3% under severe drought stress (25% FC), and by 53.2% under severe combined stress (25% FC at 35°C)”
t0“durum wheat”
Claim · model-written summary
Aerial part length and dry matter content were proposed as screening criteria for both stresses.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- aerial part length, dry matter contente0
- Qualifier
- efficient screening criteriae0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aerial part length, dry matter content, hydrogen peroxide content, catalase, and Glutathione peroxidase activities could be efficient screening criteria for both stresses”
t0“durum wheat”
Claim · model-written summary
Hydrogen peroxide content and catalase and glutathione peroxidase activities were proposed as stress screening criteria.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Outcome
- hydrogen peroxide content, catalase, and Glutathione peroxidase activitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hydrogen peroxide content, catalase, and Glutathione peroxidase activities could be efficient screening criteria for both stresses”
t0“durum wheat”
Claim · model-written summary
Aouija tolerated all three stresses.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- Aouijae0
- Outcome
- tolerated the three studied stressese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only the landrace Aouija tolerated the three studied stresses”
t0“durum wheat”
Claim · model-written summary
Biskri and Hedhba tolerated drought and heat but were sensitive under combined stress.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- Biskri and Hedhba genotypese0
- Outcome
- tolerant to drought and heat stresses and showed the same sensitivity under combined stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biskri and Hedhba genotypes were tolerant to drought and heat stresses and showed the same sensitivity under combined stress”
t0“durum wheat”
Claim · model-written summary
Karim and Hmira were the genotypes most affected by drought.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- Karim and the landrace Hmirae0
- Outcome
- most affected genotypes by droughte0
- Direction
- most affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improved genotype Karim and the landrace Hmira were the most affected genotypes by drought”
t0“durum wheat”
Claim · model-written summary
Hmira had minimum growth under heat stress.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- Hmira genotypee0
- Treatment
- heat stresse0
- Outcome
- growthe0
- Direction
- minimume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“minimum growth for the Hmira genotype under heat stress”
t0“durum wheat”
Claim · model-written summary
Combined drought and heat had a more pronounced impact than either stress alone.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Treatment
- combined drought and heat stressese0
- Outcome
- impacte0
- Direction
- more pronouncede0
- Comparator
- simple effectse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combined drought and heat stresses had a more pronounced impact than simple effects”
t0“durum wheat”
The same questions in other papers
drought · quality: grain · Triticum turgidum (rivet wheat)Results agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.