Abstract
In order to clarify the relationship between water use efficiency (apparent photosynthetic rate/transpiration rate) and the synthesis and deposition of epicuticular wax and of lipids in leaf internal tissues in various forage crops with different drought tolerance, the contribution of cuticular wax to the leaf cuticular resistance to water loss under water stress was estimated. Under water stress conditions, the cuticular resistance of the drought tolerant plant Chloris gayana Kunth. increased about twofold compared with that of a well-watered plant, whereas the cuticular resistance of the sensitive plant Coix lacryma-jobi L. increased by about 10%. The amount of epicuticular wax deposited on the leaf surface in both plants increased by water stress. However, the amount in the tolerant plant was much higher than those in the sensitive one. Radioactivity of 14C incorporated into the leaf surface wax of stressed C. gayana and C. lacryma-jobi plants was 27 and 50% less than that of well-watered plants, respectively, when they were treated with 14C-malonate and 14C-acetate. Leaves of water-stressed C. gayana assimilated 14C from 14C-malonate and 14C-acetate into the lipids of their internal tissues 5.7 times more than the leaves of well-watered plants, while the leaves of water-stressed C. lacryma-jobi assimilated 78% of the amount recorded in well-watered plants. On the other hand, the cuticular resistance of bloom lines of Sorghum bicolor L. with a high accumulation of wax on the epicuticular surface increased by about 90% by water stress, whereas the cuticular resistance of a bloomless line with a low amount of wax increased by about only 15%. Water use efficiency of bloom lines of sorghum increased remarkably by water stress, whereas that of the bloomless line of sorghum decreased. These data suggest that in the drought-tolerant plants the water retention ability of the leaves increased due to the deposition of a larger amount of wax on their leaf surfaces, and a higher accumulation of lipids in internal tissues. Also these plants produced larger amounts of dry matter by increasing the water use efficiency through the reduction of cuticular evaporation under water stress conditions.
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Claims 14
Claim · model-written summary
Water stress increased cuticular resistance about twofold in Chloris gayana.
- Taxon
- Chloris gayana Kunth.
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Chloris gayanae0 - Treatment
- water stresse0
- Outcome
- cuticular resistancee0
- Direction
- increasede0
- Value
- about twofolde0
- Comparator
- well-watered plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e0“Under water stress conditions, the cuticular resistance of the drought tolerant plant Chloris gayana Kunth. increased about twofold compared with that of a well-watered plant”
Claim · model-written summary
Water stress increased cuticular resistance by about 10% in Coix lacryma-jobi.
- Taxon
- Coix lacryma-jobi L.
Coix lacryma-jobie0 - Treatment
- water stresse1
- Outcome
- cuticular resistancee0
- Direction
- increasede0
- Value
- about 10%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuticular resistance of the sensitive plant Coix lacryma-jobi L. increased by about 10%”
e1“Under water stress conditions”
Claim · model-written summary
Water stress increased leaf surface epicuticular wax in both plants.
- Taxon
- Warm Season Forage Cropst0
- Treatment
- water stresse0
- Outcome
- epicuticular wax deposited on the leaf surfacee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“The amount of epicuticular wax deposited on the leaf surface in both plants increased by water stress.”
t0“Warm Season Forage Crops”
Claim · model-written summary
The tolerant plant had much more epicuticular wax than the sensitive plant.
- Taxon
- Chloris gayana Kunth.Chloris gayanae1
- Outcome
- the amounte0
- Direction
- much highere0
- Comparator
- sensitive onee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount in the tolerant plant was much higher than those in the sensitive one”
e1“Chloris gayana Kunth.”
e2“Coix lacryma-jobi L.”
Claim · model-written summary
In stressed C. gayana, carbon incorporation into leaf surface wax was 27% less than in well-watered plants.
- Taxon
- C. gayanaChloris gayanae0
- Treatment
- stressede0
- Outcome
- Radioactivity of 14C incorporated into the leaf surface waxe0
- Direction
- lesse0
- Value
- 27e0
- Comparator
- well-watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Radioactivity of 14C incorporated into the leaf surface wax of stressed C. gayana and C. lacryma-jobi plants was 27 and 50% less than that of well-watered plants, respectively”
Claim · model-written summary
In stressed C. lacryma-jobi, carbon incorporation into leaf surface wax was 50% less than in well-watered plants.
- Taxon
- C. lacryma-jobiCoix lacryma-jobie0
- Treatment
- stressede0
- Outcome
- Radioactivity of 14C incorporated into the leaf surface waxe0
- Direction
- lesse0
- Value
- 50%e0
- Comparator
- well-watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Radioactivity of 14C incorporated into the leaf surface wax of stressed C. gayana and C. lacryma-jobi plants was 27 and 50% less than that of well-watered plants, respectively”
Claim · model-written summary
Water-stressed C. gayana leaves incorporated 5.7 times more carbon into internal lipids.
- Taxon
- C. gayanaChloris gayanae0
- Treatment
- water-stressede0
- Outcome
- assimilated 14C from 14C-malonate and 14C-acetate into the lipids of their internal tissuese0
- Direction
- moree0
- Value
- 5.7 timese0
- Comparator
- well-watered plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of water-stressed C. gayana assimilated 14C from 14C-malonate and 14C-acetate into the lipids of their internal tissues 5.7 times more than the leaves of well-watered plants”
Claim · model-written summary
Water-stressed C. lacryma-jobi leaves incorporated 78% of the well-watered amount into internal lipids.
- Taxon
- C. lacryma-jobiCoix lacryma-jobie0
- Treatment
- water-stressede0
- Outcome
- assimilatede0
- Value
- 78%e0
- Comparator
- well-watered plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of water-stressed C. lacryma-jobi assimilated 78% of the amount recorded in well-watered plants”
e1“into the lipids of their internal tissues”
Claim · model-written summary
Water stress raised cuticular resistance about 90% in bloom sorghum lines.
- Taxon
- Sorghum bicolor L.
Sorghum bicolore0 - Material
- bloom linese0
- Treatment
- water stresse0
- Outcome
- cuticular resistancee0
- Direction
- increasede0
- Value
- about 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuticular resistance of bloom lines of Sorghum bicolor L. with a high accumulation of wax on the epicuticular surface increased by about 90% by water stress”
Claim · model-written summary
Water stress raised cuticular resistance about 15% in bloomless sorghum.
- Taxon
- Sorghum bicolor L.Sorghum bicolore1
- Material
- bloomless linee0
- Treatment
- water stresse2
- Outcome
- cuticular resistancee0
- Direction
- increasede0
- Value
- about only 15%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuticular resistance of a bloomless line with a low amount of wax increased by about only 15%”
e1“Sorghum bicolor L.”
e2“about only 15%. Water use efficiency of bloom lines of sorghum increased remarkably by water stress”
Claim · model-written summary
Water stress increased water use efficiency in bloom sorghum lines.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency of bloom lines of sorghum increased remarkably by water stress”
Claim · model-written summary
Water stress decreased water use efficiency in bloomless sorghum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that of the bloomless line of sorghum decreased”
e1“Water use efficiency of bloom lines of sorghum increased remarkably by water stress”
Claim · model-written summary
The authors attributed greater drought leaf water retention to wax deposition and internal lipid accumulation.
Verbatim
e0“in the drought-tolerant plants the water retention ability of the leaves increased due to the deposition of a larger amount of wax on their leaf surfaces, and a higher accumulation of lipids in internal tissues”
t0“Warm Season Forage Crops”
Claim · model-written summary
The authors attributed greater dry matter production to improved water use efficiency and reduced cuticular evaporation.
Verbatim
e0“these plants produced larger amounts of dry matter by increasing the water use efficiency through the reduction of cuticular evaporation under water stress conditions”
t0“Warm Season Forage Crops”
The same questions in other papers
drought · physiology: water · SorghumResults differ
8 papers in the same direction as this paper · 16 in the opposite direction
- positive
- negative
- negative
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See all 25 papers →drought · disease · Sorghum bicolor (sorghum)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.