Abstract
Abstract With increasingly erratic rainfall patterns particularly in drought‐prone production systems, the capacity of plants to recover productively from drought spells becomes an important feature for yield stability in rainfed agriculture. Consequently, effects of water management at the stem elongation stage on partitioning and remobilization of dry matter, alteration in photosynthesis and water‐use efficiency ( WUE ), and yield components of wheat plants were studied in a glasshouse pot experiment. The plants were subjected to three soil moisture regimes: well watered during all phenological stages ( WW ), drought affected during stem elongation and post‐anthesis stages ( DD ) and drought affected during stem elongation and rewatered at post‐anthesis stage ( DW ). Total dry weight substantially decreased by both drought treatments. However, DD plants allocated relatively higher assimilates to roots whereas DW plants remobilized them to the grains. Drought applications resulted in a decrease of grain yield and thousand grain weight while reduction was more pronounced in DD treatment. Relative contribution of post‐anthesis photosynthesis to dry matter formation in grain was higher in WW treatment (72.6 %) than DD (68.5 %) and DW (68.2 %) treatments. Photosynthetic rate, gas exchange and transpiration decreased whereas leaf (photosynthetic) and plant level WUE increased with drought applications. However, all these parameters were rapidly and completely reversed by rewatering. Our findings showed that partitioning of dry weight to grain increases with rewatering of wheat plants subjected to drought during stem elongation phase, but the relative contributions of remobilization of stem reserves and post‐anthesis photosynthesis to grain did not change. Moreover, rewatering of plants at booting stage after a drought period lead to full recovery in photosynthesis and WUE , and a significant although partial recovery of yield components, such as grain yield, TGW and harvest index.
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Claims 13
Claim · model-written summary
Total dry weight of wheat decreased under both drought treatments compared with well-watered plants.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- drought treatmentse1
- Outcome
- Total dry weighte1
- Direction
- decreasede1
- Comparator
- well waterede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“Total dry weight substantially decreased by both drought treatments”
e2“well watered during all phenological stages ( WW )”
Claim · model-written summary
Under DD drought, wheat allocated relatively more assimilates to roots.
- Taxon
- wheatTriticum aestivume0
- Treatment
- DDe1
- Outcome
- assimilates to rootse1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“DD plants allocated relatively higher assimilates to roots”
Claim · model-written summary
Under DW drought, wheat remobilized assimilates to the grains.
- Taxon
- wheatTriticum aestivume0
- Treatment
- DWe1
- Outcome
- remobilized them to the grainse1
- Direction
- remobilizede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“DW plants remobilized them to the grains”
Claim · model-written summary
Drought decreased grain yield and thousand grain weight of wheat.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Drought applicationse1
- Outcome
- grain yield and thousand grain weighte1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“Drought applications resulted in a decrease of grain yield and thousand grain weight”
Claim · model-written summary
The reduction in grain yield and thousand grain weight was more pronounced under DD than under the other drought treatment.
- Taxon
- wheatTriticum aestivume0
- Treatment
- DD treatmente1
- Outcome
- reductione1
- Direction
- more pronouncede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“while reduction was more pronounced in DD treatment”
Claim · model-written summary
The relative contribution of post-anthesis photosynthesis to grain dry matter was higher under WW (72.6 %) than under DD (68.5 %) and DW (68.2 %).
- Taxon
- wheatTriticum aestivume0
- Treatment
- WW treatmente1
- Outcome
- Relative contributione1
- Direction
- highere1
- Value
- 72.6 %e1
- Comparator
- DDe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“Relative contribution of post‐anthesis photosynthesis to dry matter formation in grain was higher in WW treatment (72.6 %) than DD (68.5 %) and DW (68.2 %) treatments”
Claim · model-written summary
Photosynthetic rate, gas exchange and transpiration of wheat decreased under drought.
- Taxon
- wheatTriticum aestivume0
- Treatment
- drought applicationse2
- Outcome
- Photosynthetic rate, gas exchange and transpiratione1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“Photosynthetic rate, gas exchange and transpiration decreased”
e2“leaf (photosynthetic) and plant level WUE increased with drought applications”
Claim · model-written summary
Leaf and plant-level water-use efficiency of wheat increased under drought.
- Taxon
- wheatTriticum aestivume0
- Treatment
- drought applicationse2
- Outcome
- leaf (photosynthetic) and plant level WUEe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e2“leaf (photosynthetic) and plant level WUE increased with drought applications”
Claim · model-written summary
All these parameters of wheat were rapidly and completely reversed by rewatering.
- Taxon
- wheatTriticum aestivume0
- Treatment
- rewateringe1
- Outcome
- all these parameterse1
- Direction
- reversede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“all these parameters were rapidly and completely reversed by rewatering”
Claim · model-written summary
Rewatering of wheat subjected to drought at stem elongation increased the partitioning of dry weight to grain.
- Taxon
- wheatTriticum aestivume0
- Treatment
- rewatering of wheat plants subjected to drought during stem elongation phasee1
- Outcome
- partitioning of dry weight to graine1
- Direction
- increasese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“partitioning of dry weight to grain increases with rewatering of wheat plants subjected to drought during stem elongation phase”
Claim · model-written summary
The relative contributions of stem reserve remobilization and post-anthesis photosynthesis to grain did not change in wheat.
- Taxon
- wheatTriticum aestivume0
- Organ / stage
- stem reservese1
- Outcome
- relative contributions of remobilization of stem reservese1
- Direction
- did not changee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“the relative contributions of remobilization of stem reserves and post‐anthesis photosynthesis to grain did not change”
Claim · model-written summary
Rewatering of wheat at booting after drought gave full recovery of photosynthesis and WUE.
- Taxon
- wheatTriticum aestivume0
- Treatment
- rewatering of plants at booting stage after a drought periode1
- Outcome
- photosynthesis and WUEe1
- Direction
- full recoverye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“rewatering of plants at booting stage after a drought period lead to full recovery in photosynthesis and WUE”
Claim · model-written summary
Rewatering at booting after drought gave a significant but partial recovery of yield components of wheat.
- Taxon
- wheatTriticum aestivume0
- Treatment
- rewatering of plants at booting stage after a drought periode2
- Outcome
- yield componentse1
- Direction
- partial recoverye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield components of wheat plants were studied in a glasshouse pot experiment”
e1“a significant although partial recovery of yield components, such as grain yield, TGW and harvest index”
e2“rewatering of plants at booting stage after a drought period”
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