Abstract
In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility. Our objective was to establish what phosiological processes caused sterility during drought. We applied several soil-drying treatments to pot-grown plants of three rice cultivars (one lowland and two upland) for 10 days during the booting phase. Flag leaf elongation rate (LER), the rate of dry matter production (DMP) and leaf water potential (LWP) decreased and sterlity increased in all cultivars as the intensity of soil drying increased. Increasing sterility was closely correlated with reduced DMP in all cultivars. It has been assumed previously that suppressed assimilate supply causes sterility. However, when DMP was strongly suppressed by shading under well-watered conditions, sterility was unaffected. Moreover, when part of the root system was partially dried at the booting stage, sterility significantly increased and leaf diffusive conductance decreased when compared with the results for well-watered plants, although there was no significant difference in LWP between the treatments. We suggest that sterility in rice plants subjected to soil drying during the booting stage occurs not by reduced assimilation or because of water deficits in the shoot, but by some chemical signal from roots to shoots.
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Claims 8
Claim · model-written summary
Soil drying decreased flag leaf elongation rate, dry matter production and leaf water potential in rice as drying intensity increased.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- booting phasee7
- Treatment
- soil dryinge1
- Outcome
- Flag leaf elongation rate (LER), the rate of dry matter production (DMP) and leaf water potential (LWP)e1
- Direction
- decreasede1
- Qualifier
- as the intensity of soil drying increasede1
- Setting
- pot-grown plantse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e1“Flag leaf elongation rate (LER), the rate of dry matter production (DMP) and leaf water potential (LWP) decreased and sterlity increased in all cultivars as the intensity of soil drying increased”
e7“We applied several soil-drying treatments to pot-grown plants of three rice cultivars (one lowland and two upland) for 10 days during the booting phase”
Claim · model-written summary
Soil drying increased sterility in all rice cultivars as drying intensity increased.
- Taxon
- riceOryza sativae0
- Organ / stage
- booting phasee7
- Treatment
- soil dryinge1
- Outcome
- sterlitye1
- Direction
- increasede1
- Qualifier
- as the intensity of soil drying increasede1
- Setting
- pot-grown plantse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e1“Flag leaf elongation rate (LER), the rate of dry matter production (DMP) and leaf water potential (LWP) decreased and sterlity increased in all cultivars as the intensity of soil drying increased”
e7“We applied several soil-drying treatments to pot-grown plants of three rice cultivars (one lowland and two upland) for 10 days during the booting phase”
Claim · model-written summary
Sterility increased as dry matter production decreased across all rice cultivars, a close correlation.
- Taxon
- riceOryza sativae0
- Material
- all cultivarse2
- Outcome
- DMPe2
- Direction
- reducede2
- Qualifier
- closely correlatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e2“Increasing sterility was closely correlated with reduced DMP in all cultivars”
Claim · model-written summary
Shading that strongly suppressed dry matter production under well-watered conditions left sterility unaffected in rice.
- Taxon
- riceOryza sativae0
- Treatment
- shadinge3
- Outcome
- sterilitye3
- Direction
- unaffectede3
- Qualifier
- when DMP was strongly suppressede3
- Comparator
- well-watered conditionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e3“when DMP was strongly suppressed by shading under well-watered conditions, sterility was unaffected”
Claim · model-written summary
Partial drying of the root system at the booting stage significantly increased sterility compared with well-watered rice plants.
- Taxon
- riceOryza sativae0
- Organ / stage
- booting stagee4
- Treatment
- part of the root system was partially driede4
- Outcome
- sterilitye4
- Direction
- increasede4
- Comparator
- well-watered plantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e4“when part of the root system was partially dried at the booting stage, sterility significantly increased and leaf diffusive conductance decreased when compared with the results for well-watered plants”
Claim · model-written summary
Partial drying of the root system at the booting stage decreased leaf diffusive conductance compared with well-watered rice plants.
- Taxon
- riceOryza sativae0
- Organ / stage
- booting stagee4
- Treatment
- part of the root system was partially driede4
- Outcome
- leaf diffusive conductancee4
- Direction
- decreasede4
- Comparator
- well-watered plantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e4“when part of the root system was partially dried at the booting stage, sterility significantly increased and leaf diffusive conductance decreased when compared with the results for well-watered plants”
Claim · model-written summary
Leaf water potential did not differ significantly between partially dried root systems and well-watered rice plants.
- Taxon
- riceOryza sativae0
- Treatment
- part of the root system was partially driede4
- Outcome
- LWPe5
- Direction
- no significant differencee5
- Comparator
- well-watered plantse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e4“when part of the root system was partially dried at the booting stage, sterility significantly increased and leaf diffusive conductance decreased when compared with the results for well-watered plants”
e5“there was no significant difference in LWP between the treatments”
Claim · model-written summary
Sterility under soil drying is proposed to arise from a chemical signal from roots to shoots, not from reduced assimilation or shoot water deficit.
- Taxon
- riceOryza sativae0
- Outcome
- sterilitye6
- Qualifier
- chemical signal from roots to shootse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice plants a drought at the booting stage is the event most damaging to grain yield because it drastically increases sterility”
e6“We suggest that sterility in rice plants subjected to soil drying during the booting stage occurs not by reduced assimilation or because of water deficits in the shoot, but by some chemical signal from roots to shoots”
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