Abstract
L.) production worldwide. In this study, we investigated the effects of drought stress at the booting stage on rice leaf physiological characteristics and yield. The results showed that drought stress would lead to a significant decrease in chlorophyll content and photosynthesis in rice leaves, which would affect rice yield. Three different rice varieties were used in this study, namely Hanyou73 (HY73), Huanghuazhan (HHZ), and IRAT109. Under drought stress, the chlorophyll content of all cultivars decreased significantly: 11.1% and 32.2% decreases in chlorophyll a and chlorophyll b in HHZ cultivars, 14.1% and 28.5% decreases in IRAT109 cultivars, and 22.9% and 18.6% decreases in HY73 cultivars, respectively. In addition, drought stress also led to a significant decrease in leaf water potential, a significant increase in antioxidant enzyme activity, and an increase in malondialdehyde (MDA) content, suggesting that rice activated a defense mechanism to cope with drought-induced oxidative stress. This study also found that drought stress significantly reduced the net photosynthetic rate and stomatal conductance of rice, which, in turn, affected the yield of rice. Under drought stress, the yield of the HHZ cultivars decreased most significantly, reaching 30.2%, while the yields of IRAT109 and HY73 cultivars decreased by 13.0% and 18.2%, respectively. The analysis of yield composition showed that the number of grains per panicle, seed-setting rate, and 1000-grain weight were the key factors affecting yield formation. A correlation analysis showed that there was a significant positive correlation between yield and net photosynthetic rate, stomatal conductance, chla/chlb ratio, Rubisco activity, and Fv/Fm, but there was a negative correlation with MDA and non-photochemical quenching (NPQ). In summary, the effects of drought stress on rice yield are multifaceted, involving changes in multiple agronomic traits. The results highlight the importance of selecting and nurturing rice varieties with a high drought tolerance, which should have efficient antioxidant systems and high photosynthetic efficiency. Future research should focus on the genetic mechanisms of these physiological responses in order to develop molecular markers to assist in the breeding of drought-tolerant rice varieties.
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Claims 16
Claim · model-written summary
Drought reduced chlorophyll a in HHZ by 11.1%.
Not reportedTaxonComparator
Verbatim
e0“Under drought stress, the chlorophyll content of all cultivars decreased significantly: 11.1% and 32.2% decreases in chlorophyll a and chlorophyll b in HHZ cultivars”
Claim · model-written summary
Drought reduced chlorophyll b in HHZ by 32.2%.
Not reportedTaxonComparator
Verbatim
e0“Under drought stress, the chlorophyll content of all cultivars decreased significantly: 11.1% and 32.2% decreases in chlorophyll a and chlorophyll b in HHZ cultivars”
Claim · model-written summary
Drought reduced chlorophyll a in IRAT109 by 14.1%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“14.1% and 28.5% decreases in IRAT109 cultivars”
Claim · model-written summary
Drought reduced chlorophyll b in IRAT109 by 28.5%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“14.1% and 28.5% decreases in IRAT109 cultivars”
Claim · model-written summary
Drought reduced chlorophyll a in HY73 by 22.9%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“22.9% and 18.6% decreases in HY73 cultivars”
Claim · model-written summary
Drought reduced chlorophyll b in HY73 by 18.6%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“22.9% and 18.6% decreases in HY73 cultivars”
Claim · model-written summary
Drought decreased leaf water potential.
Not reportedTaxonComparator
Verbatim
e0“drought stress also led to a significant decrease in leaf water potential”
Claim · model-written summary
Drought increased antioxidant enzyme activity.
Not reportedTaxonTreatmentComparator
Verbatim
e0“a significant increase in antioxidant enzyme activity”
Claim · model-written summary
Drought increased MDA content.
Not reportedTaxonTreatmentComparator
Verbatim
e0“an increase in malondialdehyde (MDA) content”
Claim · model-written summary
Drought reduced net photosynthetic rate and stomatal conductance.
- Taxon
- rice
Oryza sativae0 - Treatment
- drought stresse0
- Outcome
- net photosynthetic rate and stomatal conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress significantly reduced the net photosynthetic rate and stomatal conductance of rice”
Claim · model-written summary
Drought reduced HHZ yield by 30.2%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“the yield of the HHZ cultivars decreased most significantly, reaching 30.2%”
Claim · model-written summary
Drought reduced IRAT109 yield by 13.0%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“the yields of IRAT109 and HY73 cultivars decreased by 13.0% and 18.2%, respectively”
Claim · model-written summary
Drought reduced HY73 yield by 18.2%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“the yields of IRAT109 and HY73 cultivars decreased by 13.0% and 18.2%, respectively”
Claim · model-written summary
Grains per panicle, seed setting and grain weight were key factors in yield formation.
Not reportedTaxonDirection
Verbatim
e0“the number of grains per panicle, seed-setting rate, and 1000-grain weight were the key factors affecting yield formation”
Claim · model-written summary
Yield correlated positively with photosynthetic and related measures.
Not reportedTaxonOrgan / stage
Verbatim
e0“significant positive correlation between yield and net photosynthetic rate, stomatal conductance, chla/chlb ratio, Rubisco activity, and Fv/Fm”
Claim · model-written summary
Yield correlated negatively with MDA and NPQ.
Not reportedTaxon
Verbatim
e0“negative correlation with MDA and non-photochemical quenching (NPQ)”
The same questions in other papers
drought · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
77 papers in the same direction as this paper · 18 in the opposite direction
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