Abstract
Drought and high temperature often occurs simultaneously, causing significant yield losses in wheat (Triticum aestivum L.). The objectives of this study were to: (i) quantify independent and combined effects of drought and high temperature stress on synthetic hexaploid wheat genotypes at anthesis and at 21 days after anthesis; and (ii) determine whether responses to stress varied among genotypes. Four synthetic hexaploid and two spring wheat genotypes were grown from emergence to anthesis (Experiment I) and emergence to 21 days after anthesis (Experiment II), with full irrigation and 21/15°C day/night temperature. Thereafter, four treatments were imposed for 16 days as (a) optimum condition: irrigation+21/15°C, (b) drought stress: withhold irrigation+21/15°C, (c) high temperature stress: irrigation+36/30°C and (d) combined stress: withhold irrigation+36/30°C. Results indicated a decrease in leaf chlorophyll, individual grain weight and grain yield in an increasing magnitude of drought<high temperature<combined stress. There were 69, 81 and 92% grain yield decreases in Experiment I and 26, 37 and 50% in Experiment II under drought, high temperature and combined stress respectively. Synthetic hexaploid wheat genotypes varied in their response to stresses. Genotypes ALTAR 84/AO'S' and ALTAR 84/Aegilops tauschii Coss. (WX 193) were least affected by combined stress in Experiments I and II respectively. Overall, combined effect of drought+high temperature stress was more detrimental than the individual stress and the interaction effect was hypo-additive in nature.
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Claims 13
Claim · model-written summary
Leaf chlorophyll declined across drought, heat and combined stress, with increasing severity.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- drought<high temperature<combined stresse0
- Outcome
- leaf chlorophylle0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in leaf chlorophyll, individual grain weight and grain yield in an increasing magnitude of drought<high temperature<combined stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Individual grain weight declined across drought, heat and combined stress, with increasing severity.
- Taxon
- wheatTriticum aestivume1
- Treatment
- drought<high temperature<combined stresse0
- Outcome
- individual grain weighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in leaf chlorophyll, individual grain weight and grain yield in an increasing magnitude of drought<high temperature<combined stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Grain yield declined across drought, heat and combined stress, with increasing severity.
- Taxon
- wheatTriticum aestivume1
- Treatment
- drought<high temperature<combined stresse0
- Outcome
- grain yielde0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in leaf chlorophyll, individual grain weight and grain yield in an increasing magnitude of drought<high temperature<combined stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Experiment I grain yield decreased 69% under drought.
- Taxon
- wheatTriticum aestivume1
- Treatment
- droughte0
- Outcome
- grain yielde0
- Direction
- decreasese0
- Setting
- Experiment Ie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 69, 81 and 92% grain yield decreases in Experiment I and 26, 37 and 50% in Experiment II under drought, high temperature and combined stress respectively”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Experiment I grain yield decreased 81% under high temperature.
- Taxon
- wheatTriticum aestivume1
- Treatment
- high temperaturee0
- Outcome
- grain yielde0
- Direction
- decreasese0
- Setting
- Experiment IIe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 69, 81 and 92% grain yield decreases in Experiment I and 26, 37 and 50% in Experiment II under drought, high temperature and combined stress respectively”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Experiment I grain yield decreased 92% under combined stress.
- Taxon
- wheatTriticum aestivume1
- Treatment
- combined stresse0
- Outcome
- grain yielde0
- Direction
- decreasese0
- Value
- 92%e0
- Setting
- Experiment Ie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 69, 81 and 92% grain yield decreases in Experiment I and 26, 37 and 50% in Experiment II under drought, high temperature and combined stress respectively”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Experiment II grain yield decreased 26% under drought.
- Taxon
- wheatTriticum aestivume1
- Treatment
- droughte0
- Outcome
- grain yielde0
- Direction
- decreasese0
- Setting
- Experiment IIe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 69, 81 and 92% grain yield decreases in Experiment I and 26, 37 and 50% in Experiment II under drought, high temperature and combined stress respectively”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Experiment II grain yield decreased 37% under high temperature.
- Taxon
- wheatTriticum aestivume1
- Treatment
- high temperaturee0
- Outcome
- grain yielde0
- Direction
- decreasese0
- Setting
- Experiment IIe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 69, 81 and 92% grain yield decreases in Experiment I and 26, 37 and 50% in Experiment II under drought, high temperature and combined stress respectively”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Experiment II grain yield decreased 50% under combined stress.
- Taxon
- wheatTriticum aestivume1
- Treatment
- combined stresse0
- Outcome
- grain yielde0
- Direction
- decreasese0
- Value
- 50%e0
- Setting
- Experiment IIe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were 69, 81 and 92% grain yield decreases in Experiment I and 26, 37 and 50% in Experiment II under drought, high temperature and combined stress respectively”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Synthetic hexaploid wheat genotypes varied in stress response.
- Taxon
- wheatTriticum aestivume0
- Material
- Synthetic hexaploid wheat genotypese0
- Outcome
- response to stressese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Synthetic hexaploid wheat genotypes varied in their response to stresses”
Claim · model-written summary
ALTAR 84/AO'S' was least affected by combined stress in Experiment I.
Not reportedTaxon
Verbatim
e0“Genotypes ALTAR 84/AO'S' and ALTAR 84/Aegilops tauschii Coss. (WX 193) were least affected by combined stress in Experiments I and II respectively”
Claim · model-written summary
ALTAR 84/Aegilops tauschii Coss. (WX 193) was least affected by combined stress in Experiment II.
- Material
- ALTAR 84/Aegilops tauschii Coss. (WX 193)e0
- Outcome
- least affected by combined stresse0
- Setting
- Experiments I and IIe0
Not reportedTaxon
Verbatim
e0“Genotypes ALTAR 84/AO'S' and ALTAR 84/Aegilops tauschii Coss. (WX 193) were least affected by combined stress in Experiments I and II respectively”
Claim · model-written summary
The combined drought and heat interaction was hypo-additive.
- Taxon
- wheatTriticum aestivume1
- Outcome
- interaction effect was hypo-additivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interaction effect was hypo-additive in nature”
e1“wheat (Triticum aestivum L.)”
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