Abstract
Yields of wheat in semiarid and arid zones are limited by drought, and water condition is very important at each stage of development. Studies carried out at Loess Plateau in the northwestern part of China indicated that yield of spring wheat (Triticum aestivum L.) cv. Dingxi 81-392 was reduced by 41% when subjected to water stress. The effects of two water regimens on net photosynthetic rate (P N), stomatal conductance (g s), and intercellular CO2 concentration (C i) were investigated at the jointing, booting, anthesis, and grain filling stages. Low soil moisture in comparison to adequate one had invariably reduced P N during the diurnal variations at the four growth stages. P N and g s in both soil moisture regimes was maximally reduced at midday. C i and the stomatal limitation fluctuated remarkably during photosynthesis midday depression processes, especially at the grain filling stage. Hence atmospheric drought at midday was one of the direct causes inducing stomata closure and the g s depression, but it was beneficial for maintaining stable intrinsic water use efficiency. Fluctuation in C i implicated that non-stomatal limitation also plays an important role during the period of photosynthesis midday depression. Consequently stomatal and/or non-stomatal limitation are the possible cause of the midday photosynthesis decline.
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Claims 8
Claim · model-written summary
Water stress reduced spring wheat yield by 41%.
- Taxon
- spring wheat
Triticum aestivume0 - Material
- Dingxi 81-392e0
- Treatment
- water stresse0
- Outcome
- yielde0
- Direction
- reducede0
- Value
- 41%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of spring wheat (Triticum aestivum L.) cv. Dingxi 81-392 was reduced by 41% when subjected to water stress”
Claim · model-written summary
Low soil moisture reduced net photosynthetic rate at all four growth stages.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- Low soil moisturee0
- Outcome
- P Ne0
- Direction
- reducede0
- Qualifier
- four growth stagese0
- Comparator
- adequate onee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Spring Wheat”
e0“Low soil moisture in comparison to adequate one had invariably reduced P N during the diurnal variations at the four growth stages”
Claim · model-written summary
Photosynthetic rate and stomatal conductance were maximally reduced at midday under both moisture regimes.
- Taxon
- Spring WheatTriticum aestivumt0
- Outcome
- P N and g se0
- Direction
- maximally reducede0
- Qualifier
- at middaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Spring Wheat”
e0“P N and g s in both soil moisture regimes was maximally reduced at midday”
Claim · model-written summary
Intercellular CO2 concentration and stomatal limitation fluctuated during midday photosynthesis depression, especially at grain filling.
- Taxon
- Spring WheatTriticum aestivumt0
- Organ / stage
- grain filling stagee0
- Outcome
- C i and the stomatal limitatione0
- Direction
- fluctuatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Spring Wheat”
e0“C i and the stomatal limitation fluctuated remarkably during photosynthesis midday depression processes, especially at the grain filling stage”
Claim · model-written summary
The authors identify atmospheric drought at midday as a direct cause of stomatal closure and conductance depression.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- atmospheric drought at middaye0
- Outcome
- stomata closure and the g s depressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Spring Wheat”
e0“atmospheric drought at midday was one of the direct causes inducing stomata closure and the g s depression”
Claim · model-written summary
Midday atmospheric drought helped maintain stable intrinsic water use efficiency.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- atmospheric drought at middaye1
- Outcome
- stable intrinsic water use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Spring Wheat”
e0“it was beneficial for maintaining stable intrinsic water use efficiency”
e1“atmospheric drought at midday”
Claim · model-written summary
Fluctuation in intercellular CO2 concentration implicated non-stomatal limitation in midday photosynthesis depression.
- Taxon
- Spring WheatTriticum aestivumt0
- Outcome
- photosynthesis midday depressione0
- Qualifier
- non-stomatal limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Spring Wheat”
e0“Fluctuation in C i implicated that non-stomatal limitation also plays an important role during the period of photosynthesis midday depression”
Claim · model-written summary
Stomatal and non-stomatal limitations were proposed as possible causes of midday photosynthesis decline.
- Taxon
- Spring WheatTriticum aestivumt0
- Outcome
- midday photosynthesis declinee0
- Qualifier
- stomatal and/or non-stomatal limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Spring Wheat”
e0“stomatal and/or non-stomatal limitation are the possible cause of the midday photosynthesis decline”
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