Abstract
Abstract. Drought effects on the final leaf area of individual leaves were hypothesized to depend on the leaf developmental stage at which drought occurred. To evaluate this hypothesis, final leaf area and cell number were measured for soybean ( Glycine max (L.) Merr.) leaves that were at different stages of development when single or cyclical drought treatment was imposed. Leaf emergence rate from the meristem, as depicted by changes in the plastochron index, was not as sensitive as leaf expansion to cyclical droughts. For leaf expansion, small leaves, once they emerged from the meristem, suffered larger decreases in growth than leaves undergoing rapid leaf area expansion. Decreases in final leaf area as a result of a cyclical drought were correlated with decreases in final cell number. Decreases resulting from a single 8‐d drought were dependent on the age of the leaf at the time of drought, because small leaves were found to have proportionately larger decreases in final cell number and area than larger leaves. These results indicated that age‐dependent leaf responses to drought are based on the relative activity of cell division and expansion at the time stress was imposed.
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Claims 5
Claim · model-written summary
Leaf emergence was less sensitive than expansion to cyclical drought.
- Taxon
- soybean
Glycine maxt0 - Treatment
- cyclical droughtse0
- Outcome
- Leaf emergence ratee0
- Direction
- not as sensitivee0
- Comparator
- leaf expansione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf emergence rate from the meristem, as depicted by changes in the plastochron index, was not as sensitive as leaf expansion to cyclical droughts.”
t0“soybean”
Claim · model-written summary
Small emerging leaves had larger growth decreases than rapidly expanding leaves.
- Taxon
- soybeanGlycine maxt0
- Treatment
- water deficitst1
- Outcome
- growthe0
- Direction
- larger decreasese0
- Comparator
- leaves undergoing rapid leaf area expansione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“small leaves, once they emerged from the meristem, suffered larger decreases in growth than leaves undergoing rapid leaf area expansion.”
t0“soybean”
t1“water deficits”
Claim · model-written summary
Under cyclical drought, reduced final leaf area correlated with reduced final cell number.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- leafe0
- Outcome
- final leaf areae0
- Direction
- Decreasese0
- Comparator
- final cell numbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in final leaf area as a result of a cyclical drought were correlated with decreases in final cell number.”
t0“soybean”
Claim · model-written summary
During a single eight day drought, small leaves lost proportionately more final cell number than larger leaves.
- Taxon
- soybeanGlycine maxt0
- Treatment
- water deficitst1
- Outcome
- final cell numbere0
- Direction
- larger decreasese0
- Comparator
- larger leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“small leaves were found to have proportionately larger decreases in final cell number and area than larger leaves.”
t0“soybean”
t1“water deficits”
Claim · model-written summary
During a single eight day drought, small leaves lost proportionately more final area than larger leaves.
- Taxon
- soybeanGlycine maxt0
- Treatment
- water deficitst1
- Outcome
- areae0
- Direction
- larger decreasese0
- Comparator
- larger leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“small leaves were found to have proportionately larger decreases in final cell number and area than larger leaves.”
t0“soybean”
t1“water deficits”
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drought · growth · Glycine max (soybean)Positive and negative results
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