Abstract
Experiments were designed to assess the relative importance of rates of cell division and cell enlargement in determining the final sizes of sorghum [ Sorghum bicolor (L.) Moench, cv. ‘Oro’] leaves grown under varying degrees of water stress. Well‐watered sorghum plants were grown under atmospheric conditions which simulated natural daily cycles of air temperature and dewpoint in warm, moist conditions (experiment 1) and hot, dry conditions (experiment 2). In experiment 3, the plants were subjected to hot, dry conditions and five cycles of soil water deficit. Both the rate of increase of leaf area and the final leaf area declined progressively from experiment 1 to experiment 3. Between experiments 1 and 2, the average area per epidermal cell in leaf 11 decreased by about half as much as the leaf area. The area per cell did not decrease at all between experiments 2 and 3, despite a large decrease in leaf area. There was a progressive decline in the number of epidermal cells per leaf from experiment 1 to experiment 3. The proportion of stomatal cells changed only slightly. It was evident that the rate of cell division was at least as important as the rate of cell expansion in determining the final leaf area (assuming that epidermal cells are reasonably representative of all the cells in a leaf).
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Claims 6
Claim · model-written summary
Both the rate of increase of leaf area and the final leaf area declined progressively under increasing water stress.
- Taxon
- Sorghum bicolor
Sorghum bicolore0 - Treatment
- varying degrees of water stresse1
- Outcome
- rate of increase of leaf area and the final leaf areae2
- Direction
- declinede2
- Comparator
- experiment 1e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum bicolor (L.) Moench”
e1“leaves grown under varying degrees of water stress”
e2“Both the rate of increase of leaf area and the final leaf area declined progressively from experiment 1 to experiment 3”
Claim · model-written summary
Between experiments 1 and 2, the average area per epidermal cell decreased by about half as much as the leaf area.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Treatment
- hot, dry conditionse4
- Outcome
- average area per epidermal celle3
- Direction
- decreasede3
- Value
- about halfe3
- Comparator
- experiments 1e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum bicolor (L.) Moench”
e3“Between experiments 1 and 2, the average area per epidermal cell in leaf 11 decreased by about half as much as the leaf area”
e4“hot, dry conditions (experiment 2)”
Claim · model-written summary
The area per epidermal cell did not decrease between experiments 2 and 3, despite a large decrease in leaf area.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Treatment
- five cycles of soil water deficite6
- Outcome
- area per celle5
- Direction
- did not decrease at alle5
- Comparator
- experiments 2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum bicolor (L.) Moench”
e5“The area per cell did not decrease at all between experiments 2 and 3, despite a large decrease in leaf area”
e6“In experiment 3, the plants were subjected to hot, dry conditions and five cycles of soil water deficit”
Claim · model-written summary
The number of epidermal cells per leaf declined progressively from experiment 1 to experiment 3.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Treatment
- varying degrees of water stresse1
- Outcome
- number of epidermal cells per leafe7
- Direction
- declinee7
- Comparator
- experiment 1e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum bicolor (L.) Moench”
e1“leaves grown under varying degrees of water stress”
e7“There was a progressive decline in the number of epidermal cells per leaf from experiment 1 to experiment 3”
Claim · model-written summary
The proportion of stomatal cells changed only slightly under increasing water stress.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Treatment
- varying degrees of water stresse1
- Outcome
- proportion of stomatal cellse2
- Direction
- changed only slightlye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum bicolor (L.) Moench”
e1“leaves grown under varying degrees of water stress”
e2“The proportion of stomatal cells changed only slightly”
Claim · model-written summary
The rate of cell division was at least as important as the rate of cell expansion in determining the final leaf area.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Outcome
- final leaf areae1
- Qualifier
- the rate of cell division was at least as important as the rate of cell expansione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum bicolor (L.) Moench”
e1“It was evident that the rate of cell division was at least as important as the rate of cell expansion in determining the final leaf area”