Abstract
An experiment was conducted in growth chambers to study the response of sorghum cultivars to water deficit stress. Seven sorghum cultivars were evaluated under three water deficit levels [control (-0.05 MPa), mild stress (-0.27 MPa), and severe stress (-0.96 MPa)] in a hydroponic culture in a completely randomised block design replicated three times. The three water deficit levels were created by adding 0, 10 and 20% (w/v) polyethylene glycol 6000 (PEG 6000) to the nutrient solution. The results indicated that water deficit, especially severe water deficit (-0.96 MPa), severely affected the growth and physiology of sorghum. Water deficit stress reduced plant height, leaf area, dry matter accumulation, water use efficiency, root length, and stomatal density. Water deficit stress increased stomatal closure and thus leaf diffusive resistance. Stressed plants deposited larger amounts of epicuticular wax on leaf surfaces and stomatal openings. Water stress significantly reduced the amount of starch grains in the chloroplasts. Sorghum cultivars displayed distinctive response to water deficit stress for many of the parameters. Jigurti, Gambella 1107 and Meko grew better than P9403 and SA1486 under water deficit conditions. Jigurti showed no significant reduction in any of the growth parameters even under severe water deficit (-0.96 MPa) conditions. Keywords: Epicuticular wax; Leaf diffusive resistance; Leaf relative water content; Starch; Stomata; Water use efficiency.Ethiopian Journal of Biological Sciences Vol. 5 (2) 2006: pp. 161-176
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Claims 10
Claim · model-written summary
Water deficit reduced sorghum height, leaf area, and dry matter accumulation.
- Treatment
- Water deficit stresse0
- Outcome
- plant height, leaf area, dry matter accumulatione0
- Direction
- reducede0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit stress reduced plant height, leaf area, dry matter accumulation”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Water deficit reduced sorghum water use efficiency, root length, and stomatal density.
- Treatment
- Water deficit stresse0
- Outcome
- water use efficiency, root length, and stomatal densitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit stress reduced plant height, leaf area, dry matter accumulation, water use efficiency, root length, and stomatal density”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Water deficit increased stomatal closure and leaf diffusive resistance.
- Treatment
- Water deficit stresse0
- Outcome
- stomatal closure and thus leaf diffusive resistancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit stress increased stomatal closure and thus leaf diffusive resistance”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Stressed sorghum deposited more epicuticular wax on leaf surfaces and stomatal openings.
- Organ / stage
- leaf surfaces and stomatal openingse0
- Treatment
- Stressede0
- Outcome
- epicuticular waxe0
- Direction
- larger amountse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stressed plants deposited larger amounts of epicuticular wax on leaf surfaces and stomatal openings”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Water stress significantly reduced chloroplast starch grains.
- Organ / stage
- chloroplastse0
- Treatment
- Water stresse0
- Outcome
- amount of starch grainse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress significantly reduced the amount of starch grains in the chloroplasts”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Sorghum cultivars varied in responses to water deficit for many parameters.
- Outcome
- distinctive response to water deficit stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum cultivars displayed distinctive response to water deficit stress for many of the parameters”
Claim · model-written summary
Jigurti grew better than P9403 and SA1486 under water deficit.
- Material
- Jigurtie0
- Outcome
- grewe0
- Direction
- bettere0
- Qualifier
- under water deficit conditionse0
- Comparator
- P9403 and SA1486e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jigurti, Gambella 1107 and Meko grew better than P9403 and SA1486 under water deficit conditions”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Gambella 1107 grew better than P9403 and SA1486 under water deficit.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jigurti, Gambella 1107 and Meko grew better than P9403 and SA1486 under water deficit conditions”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Meko grew better than P9403 and SA1486 under water deficit.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jigurti, Gambella 1107 and Meko grew better than P9403 and SA1486 under water deficit conditions”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
Claim · model-written summary
Jigurti growth parameters showed no significant reduction even at severe water deficit.
- Material
- Jigurtie0
- Treatment
- severe water deficit (-0.96 MPa)e0
- Outcome
- growth parameterse0
- Direction
- no significant reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jigurti showed no significant reduction in any of the growth parameters even under severe water deficit (-0.96 MPa) conditions”
t0“Sorghum (Sorghum bicolorr (L.) Moench)”
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