Abstract
Objective The objective of the study is to reveal the drought tolerance mechanisms of different rice varieties and the physiological mechanisms about ABA reliving rice drought stress.Method Japonica drought tolerance rice Zaoyuxiangjing and conventional japonica rice Nanjing44 were pot planted until booting stage, and 150 mg·kg-1 of abscisic acid(ABA) was sprayed on leaf to study the influence on rice antioxidant enzyme activity(SOD, CAT), membrane lipid peroxidation(MDA) content, net photosynthetic rate(Pn), stomatal conductance(Gs), transpiration rate(Tr), chlorophyll and soluble sugar(SS)content, biomass accumulation, yield per pot and yield components. Finally, their different biological and physiological drought resistance and response to ABA treatment were compared.Result During drought stress, rice maintained higher SOD and CAT activities, leading to a lower MDA content to a certain extent. They synthesized higher soluble sugar content to maintain cell osmotic adjustment. The leaf net Pn decreased consistently. Gs also showed a downward trend with increasing water stress, and Tr consistented with the Gs. Chlorophyll a synthesis was inhibited, and the content decreased. The result showed that dry matter accumulation and yield per pot were decreased significantly compared with CK. Two varieties showed significant differences in response to drought stress, and Zaoyuxiangjing was more drought resistant than Nanjing44. When ABA treated, Pn and dry matter accumulation were reduced in short time. While SOD activity was further improved, leading to reduction of MDA accumulation. Meanwhile, exogenous ABA induced stomatal closure during drought stress and reduced transpiration rate, the excessive water consumption was reduced and water use efficiency was improved, thus having a significant protective effect on rice, reduced the metabolic function of drought on rice physiological damage, and accelerated functional recovery after rehydration, keeping higher content of chlorophyll a to prevent leaf premature. The effect of ABA treatment was more significant on Zaoyuxiangjing. Its Pn, Gs and Tr recovered quickly after rehydration and a significant increase in chlorophyll a content. ABA also promoted its soluble sugar synthesis and dry matter accumulation more faster under drought stress, then improved its grains of per panicle, filled grain rate, 1000-grain weight and grain yield per pot significantly. ABA effect was weaker on Nanjing44 because of its general drought resistance. Nanjing44 was susceptible to drought stress, less sensitive to ABA, slow physiological and growth characteristics recovery. Although ABA significantly increased Nanjing 44 grains per panicle, filled grain rate and 1000-grain weight, it did not significantly increase the yield per pot.Conclusion The short-term dormancy effect on rice of ABA could relieve the physiological metabolic function damage of rice under booting stage stress effectively, promote its functional recovery after rehydration, and mitigate the effects of drought on yield. There were differences in the response to ABA between different drought resistance varieties. The stronger drought resistance variety was more sensitive to ABA and displayed better result to exogenous ABA.
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Claims 20
Claim · model-written summary
Drought-stressed rice maintained higher SOD and CAT activity and lower MDA.
- Taxon
- rice
Oryza sativae0 - Treatment
- drought stresse0
- Outcome
- SOD and CAT activitiese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During drought stress, rice maintained higher SOD and CAT activities, leading to a lower MDA content to a certain extent.”
Claim · model-written summary
Drought-stressed rice had higher soluble sugar content.
- Taxon
- RiceOryza sativat0
- Outcome
- soluble sugar contente0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They synthesized higher soluble sugar content to maintain cell osmotic adjustment.”
t0“Rice”
Claim · model-written summary
Leaf net photosynthetic rate decreased during drought.
- Taxon
- RiceOryza sativat0
- Treatment
- Drought Stresst0
- Outcome
- leaf net Pne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf net Pn decreased consistently.”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
Stomatal conductance declined as water stress increased.
- Taxon
- RiceOryza sativat0
- Treatment
- water stresse0
- Outcome
- Gse0
- Direction
- downward trende0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gs also showed a downward trend with increasing water stress, and Tr consistented with the Gs.”
t0“Rice”
Claim · model-written summary
Transpiration rate tracked stomatal conductance under water stress.
- Taxon
- RiceOryza sativat0
- Treatment
- water stresse0
- Outcome
- Tre0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gs also showed a downward trend with increasing water stress, and Tr consistented with the Gs.”
t0“Rice”
Claim · model-written summary
Chlorophyll a content decreased during drought.
- Taxon
- RiceOryza sativat0
- Treatment
- Drought Stresst0
- Outcome
- contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll a synthesis was inhibited, and the content decreased.”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
Dry matter accumulation decreased significantly relative to CK.
- Taxon
- RiceOryza sativat0
- Treatment
- Drought Stresst0
- Outcome
- dry matter accumulatione0
- Direction
- decreasede0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The result showed that dry matter accumulation and yield per pot were decreased significantly compared with CK.”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
Yield per pot decreased significantly relative to CK.
- Taxon
- RiceOryza sativat0
- Treatment
- Drought Stresst0
- Outcome
- yield per pote0
- Direction
- decreasede0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The result showed that dry matter accumulation and yield per pot were decreased significantly compared with CK.”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
Zaoyuxiangjing was more drought resistant than Nanjing44.
- Taxon
- RiceOryza sativat0
- Material
- Zaoyuxiangjinge0
- Outcome
- drought resistante0
- Direction
- moree0
- Comparator
- Nanjing44e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two varieties showed significant differences in response to drought stress, and Zaoyuxiangjing was more drought resistant than Nanjing44.”
t0“Rice”
Claim · model-written summary
ABA reduced photosynthetic rate and dry matter accumulation briefly.
- Taxon
- RiceOryza sativat0
- Treatment
- ABAe0
- Outcome
- Pn and dry matter accumulatione0
- Direction
- reducede0
- Qualifier
- short timee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When ABA treated, Pn and dry matter accumulation were reduced in short time.”
t0“Rice”
Claim · model-written summary
ABA further increased SOD activity.
- Taxon
- RiceOryza sativat0
- Treatment
- ABAt0
- Outcome
- SOD activitye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While SOD activity was further improved, leading to reduction of MDA accumulation.”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
ABA reduced MDA accumulation.
- Taxon
- RiceOryza sativat0
- Treatment
- ABAt0
- Outcome
- MDA accumulatione0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While SOD activity was further improved, leading to reduction of MDA accumulation.”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
ABA induced stomatal closure and reduced transpiration during drought.
- Taxon
- RiceOryza sativat0
- Treatment
- ABAe0
- Outcome
- transpiration ratee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA induced stomatal closure during drought stress and reduced transpiration rate”
t0“Rice”
Claim · model-written summary
ABA improved water use efficiency during drought.
- Taxon
- RiceOryza sativat0
- Treatment
- ABAt0
- Outcome
- water use efficiencye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiency was improved”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
ABA accelerated functional recovery after rehydration and maintained higher chlorophyll a.
- Taxon
- RiceOryza sativat0
- Treatment
- ABAt0
- Outcome
- functional recovery after rehydratione0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accelerated functional recovery after rehydration, keeping higher content of chlorophyll a to prevent leaf premature.”
t0“Analysis of Physiological Characteristics about ABA Alleviating Rice Booting Stage Drought Stress”
Claim · model-written summary
ABA had a more significant effect on Zaoyuxiangjing than Nanjing44.
- Taxon
- RiceOryza sativat0
- Material
- Zaoyuxiangjinge0
- Treatment
- ABA treatmente0
- Outcome
- effecte0
- Direction
- more significante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of ABA treatment was more significant on Zaoyuxiangjing.”
t0“Rice”
Claim · model-written summary
After rehydration, Zaoyuxiangjing Pn, Gs and Tr recovered quickly.
- Taxon
- RiceOryza sativat0
- Outcome
- Pn, Gs and Tre0
- Direction
- recovered quicklye0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Its Pn, Gs and Tr recovered quickly after rehydration and a significant increase in chlorophyll a content.”
t0“Rice”
Claim · model-written summary
Zaoyuxiangjing chlorophyll a content increased significantly after rehydration.
- Taxon
- RiceOryza sativat0
- Outcome
- chlorophyll a contente0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Its Pn, Gs and Tr recovered quickly after rehydration and a significant increase in chlorophyll a content.”
t0“Rice”
Claim · model-written summary
ABA promoted soluble sugar synthesis, dry matter accumulation and yield components in Zaoyuxiangjing.
- Taxon
- RiceOryza sativat0
- Treatment
- ABAe0
- Outcome
- soluble sugar synthesis and dry matter accumulatione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA also promoted its soluble sugar synthesis and dry matter accumulation more faster under drought stress, then improved its grains of per panicle, filled grain rate, 1000-grain weight and grain yield per pot significantly.”
t0“Rice”
Claim · model-written summary
In Nanjing44, ABA increased yield components significantly without significantly increasing yield per pot.
- Taxon
- RiceOryza sativat0
- Material
- Nanjing 44e0
- Treatment
- ABAe0
- Outcome
- yield per pote0
- Direction
- did not significantly increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although ABA significantly increased Nanjing 44 grains per panicle, filled grain rate and 1000-grain weight, it did not significantly increase the yield per pot.”
t0“Rice”
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