Abstract
Importance of the work: Rice plants are sensitive to different levels of drought during all growth stages.Drought induces reduced rice growth and yield by affecting the growth parameters and physiological traits related to photosynthate production.The response of rice plants to drought stress is useful information for evaluating drought-tolerant characteristics in high yielding cultivars.Objectives: To study the growth parameters and physiological traits, yield and yield components of two rice cultivars during various growth stages under polyethylene glycol (PEG)-induced drought stress. Materials & Methods:The Khao Dawk Mali 105 (KDML 105) and Pathum Thani 1 (PT 1) rice cultivars were grown under two conditions (non-stress and drought stress) in a hydroponic system.The growth parameters, physiological traits and yield were evaluated after water stress induction during the seedling, tillering and flowering stages.Results: The growth parameters and physiological traits of the two rice cultivars significantly decreased, while the free proline and spermidine contents increased under stress during all growth stages.However, the flowering stage was the most sensitive to drought.In addition, there was a greater decrease in all the studied growth and physiological traits of PT 1 under drought than for those of KDML 105.The grain yield was reduced by 35.9-50% for PT 1 and by 18.6-31% for KDML 105.Positive correlations were obtained between all the studied physiological traits and grain yield in both cultivars; however, the highest correlation to grain yield was obtained from the leaf water potential (LWP) and net photosynthetic rate.Main finding: The magnitudes of drought response varied between the cultivars and among the growth stages.PT 1 was more sensitive to drought than KDML 105 and the flowering stage was the most sensitive stage.LWP could be used to study the plant-water status and to evaluate drought-tolerance characteristics, as it had the highest correlation to yield, was less influenced by other variables and could be measured easily during all growth stages without damaging the whole plant.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Drought significantly reduced growth parameters and physiological traits in both rice cultivars at all stages.
- Taxon
- rice
Oryza sativae1 - Material
- Khao Dawk Mali 105 (KDML 105) and Pathum Thani 1 (PT 1)e1
- Treatment
- drought stresse2
- Outcome
- growth parameters and physiological traitse0
- Direction
- decreasede0
- Qualifier
- during all growth stagese0
- Comparator
- non-stresse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth parameters and physiological traits of the two rice cultivars significantly decreased, while the free proline and spermidine contents increased under stress during all growth stages.”
e1“Khao Dawk Mali 105 (KDML 105) and Pathum Thani 1 (PT 1) rice cultivars”
e2“non-stress and drought stress”
Claim · model-written summary
Drought increased free proline and spermidine contents in both rice cultivars at all stages.
- Taxon
- riceOryza sativae1
- Treatment
- drought stresse2
- Outcome
- free proline and spermidine contentse0
- Direction
- increasede0
- Qualifier
- during all growth stagese0
- Comparator
- non-stresse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the free proline and spermidine contents increased under stress during all growth stages”
e1“the two rice cultivars significantly decreased”
e2“non-stress and drought stress”
Claim · model-written summary
The flowering stage was the most drought-sensitive stage in rice.
- Taxon
- riceOryza sativae1
- Organ / stage
- flowering stagee0
- Outcome
- most sensitive to droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the flowering stage was the most sensitive to drought”
e1“the two rice cultivars significantly decreased”
Claim · model-written summary
PT 1 had greater drought-related declines in growth and physiological traits than KDML 105.
- Taxon
- riceOryza sativae1
- Material
- PT 1e0
- Treatment
- droughte0
- Outcome
- growth and physiological traitse0
- Direction
- greater decreasee0
- Comparator
- KDML 105e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a greater decrease in all the studied growth and physiological traits of PT 1 under drought than for those of KDML 105”
e1“the two rice cultivars significantly decreased”
Claim · model-written summary
Drought reduced PT 1 grain yield by 35.9-50%.
- Taxon
- riceOryza sativae1
- Material
- PT 1e0
- Treatment
- drought stresse2
- Outcome
- grain yielde0
- Direction
- reducede0
- Value
- 35.9-50%e0
- Comparator
- non-stresse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The grain yield was reduced by 35.9-50% for PT 1”
e1“the two rice cultivars significantly decreased”
e2“non-stress and drought stress”
Claim · model-written summary
Drought reduced KDML 105 grain yield by 18.6-31%.
- Taxon
- riceOryza sativae1
- Material
- KDML 105e0
- Treatment
- drought stresse2
- Outcome
- grain yielde0
- Direction
- reducede0
- Value
- 18.6-31%e0
- Comparator
- non-stresse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The grain yield was reduced by 35.9-50% for PT 1 and by 18.6-31% for KDML 105.”
e1“the two rice cultivars significantly decreased”
e2“non-stress and drought stress”
Claim · model-written summary
Studied physiological traits correlated positively with grain yield in both rice cultivars.
- Taxon
- riceOryza sativae1
- Material
- both cultivarse0
- Outcome
- correlations were obtained between all the studied physiological traits and grain yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Positive correlations were obtained between all the studied physiological traits and grain yield in both cultivars”
e1“the two rice cultivars significantly decreased”
Claim · model-written summary
Leaf water potential and net photosynthetic rate had the highest correlation with rice grain yield.
- Taxon
- riceOryza sativae1
- Organ / stage
- leafe0
- Outcome
- highest correlation to grain yielde0
- Qualifier
- leaf water potential (LWP) and net photosynthetic ratee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest correlation to grain yield was obtained from the leaf water potential (LWP) and net photosynthetic rate”
e1“the two rice cultivars significantly decreased”
Claim · model-written summary
The authors propose LWP for measuring plant-water status and drought tolerance because it correlates strongly with yield and is easy and nondestructive to measure.
- Taxon
- riceOryza sativae1
- Outcome
- LWP could be used to study the plant-water status and to evaluate drought-tolerance characteristicse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LWP could be used to study the plant-water status and to evaluate drought-tolerance characteristics, as it had the highest correlation to yield, was less influenced by other variables and could be measured easily during all growth stages without damaging the whole plant.”
e1“the two rice cultivars significantly decreased”
The same questions in other papers
drought · growth · Oryza sativa (rice)Positive and negative results
183 papers in the same direction as this paper · 98 in the opposite direction
- negative
- negative
- negative
278 papers more in this group
See all 282 papers →drought · yield · Oryza sativa (rice)Positive and negative results
248 papers in the same direction as this paper · 76 in the opposite direction
- positive
- positive
- negative
321 papers more in this group
See all 325 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.