Abstract
Interspecific differences in drought tolerance were studied by two solution- and one field-culture experiments in a glasshouse using Japanese millet, sorghum, pearl millet and maize. Water stress treatment for the solution culture was achieved by adding polyethylene glycol 6000 to the solution at a final concentration of 200g/1000g H2O, producing a -0.93 MPa osmotic potential, while that for the field experiment was by suspension of watering. The treatment was made for about two weeks in the vegetative growth stage. Growth parameters and leaf water status were determined at the beginning, during and after the treatment. Dry weight of plant was generally decreased less by stress in pearl millet and sorghum, while the recovery after removal of stress was faster in sorghum and Japanese millet than in the other opecies. Osmotic potential (π) as against water potential (Ψ) in stressed leaves decreased more than in the control, except for maize. The decreasing order of relative water content with a decrease of either Ψ or π was as follows : maize>Japanese millet>sorghum>pearl millet. Osmotic adjustment (OA) increased in the following order : sorghum>Japanese millet>pearl millet>maize. From these results, we concluded that sorghum and Japanese millet, especially sorghum, possess a higher dehydration tolerance due to a higher OA and pearl millet due to a larger water retention ability, whereas maize easily wilts because of a smaller OA and water retention ability.
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Claims 5
Claim · model-written summary
Stress decreased dry weight less in pearl millet and sorghum.
- Taxon
- pearl millet and sorghum
Cenchrus americanus
Sorghume0 - Treatment
- stresse0
- Outcome
- Dry weight of plante0
- Direction
- decreased lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weight of plant was generally decreased less by stress in pearl millet and sorghum”
Claim · model-written summary
Sorghum and Japanese millet recovered faster after stress removal.
- Taxon
- sorghum and Japanese milletSorghum
Echinochloa frumentaceae0 - Outcome
- recovery after removal of stresse0
- Direction
- fastere0
- Comparator
- other opeciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the recovery after removal of stress was faster in sorghum and Japanese millet than in the other opecies.”
Claim · model-written summary
Stressed leaf osmotic potential decreased more than control except in maize.
- Treatment
- stressede0
- Outcome
- Osmotic potential (π) as against water potential (Ψ)e0
- Direction
- decreased moree0
- Qualifier
- except for maizee0
- Comparator
- controle0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic potential (π) as against water potential (Ψ) in stressed leaves decreased more than in the control, except for maize.”
Claim · model-written summary
Relative water content declined in the order maize, Japanese millet, sorghum, pearl millet as water or osmotic potential declined.
- Taxon
- maize>Japanese millet>sorghum>pearl milletEchinochloa frumentaceae0
- Outcome
- relative water contente0
- Direction
- decreasinge0
- Qualifier
- decrease of either Ψ or πe0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decreasing order of relative water content with a decrease of either Ψ or π was as follows : maize>Japanese millet>sorghum>pearl millet.”
Claim · model-written summary
Osmotic adjustment ranked sorghum, Japanese millet, pearl millet and maize.
- Taxon
- sorghum>Japanese millet>pearl millet>maizeEchinochloa frumentaceae0
- Outcome
- Osmotic adjustment (OA)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic adjustment (OA) increased in the following order : sorghum>Japanese millet>pearl millet>maize.”