Abstract
Drought stress at jointing and booting stages of plant development directly affects plant growth and productivity in rice. Jointing and booting stages may overlap in high-latitude areas where water deficits occur. However, little is known about the effects of photosynthesis on grain sucrose metabolism and the differences of sucrose metabolism strategies between superior and inferior grains under different drought stress was unclear. In this study, rice plants were subjected to drought stress for 15 days at jointing-booting. Drought stress affected normal leaf growth, and decreased the leaf area index linearly. Short-term mild drought stress had positive effects on photosynthesis, but long-term drought stress reduced the transpiration rate, stomatal conductance, and intercellular CO 2 concentration. Stomatal conductance increased with drought stress duration but increased intercellular CO 2 concentration did not prevent decrease in net photosynthetic rate. Vacuolar invertase activity was important for panicle development (where its activity differed between superior and inferior grains), but not for rice grain filling. Vacuolar invertase activity of drought-sensitive rice varieties superior grains increased by 111.24%~118.46% under drought stress. Drought stress reduced sucrose-phosphate synthase activities in superior and inferior grains. SuSase activity of inferior grains affected sucrose content significantly.
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Claims 10
Claim · model-written summary
Drought reduced rice leaf area index linearly.
- Taxon
- rice
Oryza sativat0 - Treatment
- Drought stresse0
- Outcome
- leaf area indexe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress affected normal leaf growth, and decreased the leaf area index linearly”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
Short-term mild drought improved photosynthesis.
- Taxon
- riceOryza sativat0
- Treatment
- Short-term mild drought stresse0
- Outcome
- photosynthesise0
- Direction
- positive effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short-term mild drought stress had positive effects on photosynthesis”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
Long-term drought reduced transpiration rate, stomatal conductance and intercellular CO 2 concentration.
- Taxon
- riceOryza sativat0
- Treatment
- long-term drought stresse0
- Outcome
- transpiration rate, stomatal conductance, and intercellular CO 2 concentratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“long-term drought stress reduced the transpiration rate, stomatal conductance, and intercellular CO 2 concentration”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
Stomatal conductance increased with drought stress duration.
- Taxon
- riceOryza sativat0
- Treatment
- drought stress duratione0
- Outcome
- Stomatal conductancee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal conductance increased with drought stress duration”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
Net photosynthetic rate declined despite increased intercellular CO 2 concentration.
- Taxon
- riceOryza sativat0
- Outcome
- net photosynthetic ratee0
- Direction
- decreasee0
- Qualifier
- increased intercellular CO 2 concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased intercellular CO 2 concentration did not prevent decrease in net photosynthetic rate”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
Vacuolar invertase activity differed between superior and inferior grains and was important for panicle development.
- Taxon
- riceOryza sativat0
- Organ / stage
- paniclee0
- Gene
- Vacuolar invertasee0
- Outcome
- panicle developmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuolar invertase activity was important for panicle development (where its activity differed between superior and inferior grains)”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
Vacuolar invertase activity was not important for rice grain filling.
- Taxon
- riceOryza sativae0
- Gene
- Vacuolar invertasee1
- Outcome
- rice grain fillinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not for rice grain filling”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
In superior grains of drought-sensitive rice varieties, drought raised vacuolar invertase activity by 111.24%~118.46%.
- Taxon
- riceOryza sativae0
- Material
- drought-sensitive rice varietiese0
- Organ / stage
- superior grainse0
- Treatment
- drought stresse0
- Gene
- Vacuolar invertasee0
- Outcome
- Vacuolar invertase activitye0
- Direction
- increasede0
- Value
- 111.24%~118.46%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuolar invertase activity of drought-sensitive rice varieties superior grains increased by 111.24%~118.46% under drought stress”
Claim · model-written summary
Drought reduced sucrose-phosphate synthase activity in superior and inferior grains.
- Taxon
- riceOryza sativat0
- Organ / stage
- superior and inferior grainse0
- Treatment
- Drought stresse0
- Gene
- sucrose-phosphate synthasee0
- Outcome
- sucrose-phosphate synthase activitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress reduced sucrose-phosphate synthase activities in superior and inferior grains”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
Claim · model-written summary
SuSase activity of inferior grains significantly affected sucrose content.
- Taxon
- riceOryza sativat0
- Organ / stage
- inferior grainse0
- Gene
- SuSasee0
- Outcome
- sucrose contente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SuSase activity of inferior grains affected sucrose content significantly”
t0“rice grains”
e1“Vacuolar invertase activity was important for panicle development”
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See all 282 papers →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.