Abstract
An experiment was conducted to investigate the physiological and biochemical responses of two hexaploids viz., C 306 (water stress tolerant) and Hira (water stress susceptible), and two tetraploids, HW 24 ( Triticum dicoccum ) and A 9‐30‐1 ( Triticum durum ) wheat genotypes to water stress under pot culture condition. Water stress was imposed for a uniform period of 10 days at 50, 60 and 70 days after sowing (DAS) and observations were recorded at 60, 70 and 80 DAS. Total dry matter and plant height were recorded at harvest. Water stress caused a decline in relative water content (RWC), chlorophyll and carotenoid content, membrane stability and nitrate reductase activity and increased accumulation of proline at all stages and abscisic acid (ABA) at 80 DAS in all the genotypes. Both the tetraploids showed a lower reduction in RWC and highest ABA accumulation under water stress. Among the hexaploids Hira showed the most decline in RWC and the lowest ABA accumulation. The tetraploids also showed comparatively higher carotenoid content and membrane stability, closely followed by C 306, while Hira showed the minimum response under water stress. Nitrate reductase activity and chlorophyll content under irrigated conditions were highest in Hira but under water stress the lowest per cent decline was observed in C 306, followed by HW 24, A 9‐30‐1, and Hira. Proline accumulation under water stress conditions was highest in hexaploids C 306 and Hira and lowest in tetraploids HW 24 and A 9‐30‐1. Tetraploids HW 24, followed by A 9‐30‐1 maintained higher plant height and total dry matter (TDM) under water stress and also showed a lower per cent decline under stress than hexaploids C 306 and Hira. From the results it is clear that proline accumulation did not contribute to better drought tolerance of tetraploids than hexaploids. It is also apparent that water stress tolerance is the result of the cumulative action of various physiological processes, and all the parameters/processes may not be positively associated with the drought tolerance of a particular tolerant genotype.
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Claims 9
Claim · model-written summary
Water stress lowered RWC, chlorophyll, carotenoids, membrane stability, and nitrate reductase activity in all genotypes.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- Water stresse0
- Outcome
- relative water content (RWC), chlorophyll and carotenoid contente0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress caused a decline in relative water content (RWC), chlorophyll and carotenoid content, membrane stability and nitrate reductase activity”
e1“wheat genotypes”
Claim · model-written summary
Water stress increased proline at all stages and ABA at 80 DAS.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Water stresse2
- Outcome
- accumulation of prolinee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased accumulation of proline at all stages and abscisic acid (ABA) at 80 DAS”
e1“wheat genotypes”
e2“Water stress caused a decline”
Claim · model-written summary
Tetraploids had less RWC reduction and greatest ABA accumulation under stress.
- Taxon
- wheatTriticum aestivume1
- Material
- tetraploidse0
- Outcome
- lower reduction in RWC and highest ABA accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the tetraploids showed a lower reduction in RWC and highest ABA accumulation under water stress.”
e1“wheat genotypes”
Claim · model-written summary
Hira had the greatest RWC decline and lowest ABA accumulation among hexaploids.
- Taxon
- wheatTriticum aestivumt0
- Material
- Hirae0
- Outcome
- most decline in RWC and the lowest ABA accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the hexaploids Hira showed the most decline in RWC and the lowest ABA accumulation.”
t0“Hexaploid and Tetraploid Wheat”
Claim · model-written summary
Tetraploids had higher carotenoids and membrane stability than Hira under stress, with C 306 close behind.
- Taxon
- wheatTriticum aestivumt0
- Material
- tetraploidse0
- Outcome
- carotenoid content and membrane stabilitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tetraploids also showed comparatively higher carotenoid content and membrane stability, closely followed by C 306, while Hira showed the minimum response under water stress.”
t0“Hexaploid and Tetraploid Wheat”
Claim · model-written summary
Hira had highest nitrate reductase and chlorophyll under irrigation; C 306 had lowest declines under stress.
- Taxon
- wheatTriticum aestivumt0
- Material
- Hirae0
- Outcome
- Nitrate reductase activity and chlorophyll contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate reductase activity and chlorophyll content under irrigated conditions were highest in Hira but under water stress the lowest per cent decline was observed in C 306, followed by HW 24, A 9‐30‐1, and Hira.”
t0“Hexaploid and Tetraploid Wheat”
Claim · model-written summary
Proline accumulation under stress was highest in C 306 and Hira and lowest in the tetraploids.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- Proline accumulatione0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline accumulation under water stress conditions was highest in hexaploids C 306 and Hira and lowest in tetraploids HW 24 and A 9‐30‐1.”
t0“Hexaploid and Tetraploid Wheat”
Claim · model-written summary
HW 24 followed by A 9‐30‐1 maintained higher height and dry matter and lower stress declines than hexaploids.
- Taxon
- wheatTriticum aestivumt0
- Material
- HW 24e0
- Outcome
- plant height and total dry matter (TDM)e0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tetraploids HW 24, followed by A 9‐30‐1 maintained higher plant height and total dry matter (TDM) under water stress and also showed a lower per cent decline under stress than hexaploids C 306 and Hira.”
t0“Hexaploid and Tetraploid Wheat”
Claim · model-written summary
Authors concluded proline accumulation did not account for the tetraploids’ superior drought tolerance.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- drought tolerancee0
- Qualifier
- proline accumulation did not contributee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline accumulation did not contribute to better drought tolerance of tetraploids than hexaploids.”
t0“Hexaploid and Tetraploid Wheat”
The same questions in other papers
drought · physiology: water · Triticum aestivum (wheat)Positive and negative results
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