Abstract
Plant responses to water stress vary according to species, severity of the stress and the plants growth stage when the water limitation occurs. The study was focused to evaluate the effect of pre-anthesis water stress on the leaf water potential, chlorophyll fluorescence and its consequence on spikelet fertility in cultivated and weedy rice to understand whether weedy rice can be controlled by imposing water stress at reproductive stage or not. Two widely cultivated rice varieties of MR 219 and MR 232 (Oryza sativa L. ssp. indica), and two weedy rice strains of Bertam and Ketara (Oryza sativa var. nivara) were grown in polybags in rice culture system-like situations. Water stress condition (no water supplied) was then applied for 9 days prior to anthesis phase. Results showed that both cultivated rice varieties and weedy rice strains were sensitive to pre-anthesis water stress for 9 days. Almost similar responses to leaf water potential and photosynthetic traits were observed under water stress. The minimum fluorescence (Fo) of the studied genotypes significantly increased under water stress, whereas the maximum quantum yield (Fv/Fm) and maximum primary yield (Fv/Fo) of PS II were significantly declined, which resulted in drastic increased spikelet sterility (> 80%) in all studies varieties/ecotype. However, weedy rice strains were comparatively more tolerant under water stress condition than cultivated rice varieties, in respect to maintaining chlorophyll fluorescence traits and spikelet sterility, indicating these two weedy rices, Bertam and Ketara, cannot be controlled by imposing water stress at reproductive growth stages.
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Claims 7
Claim · model-written summary
Cultivated rice varieties and weedy rice strains were sensitive to 9 days of pre-anthesis water stress
- Taxon
- rice
Oryza sativae1 - Treatment
- pre-anthesis water stresse1
- Outcome
- sensitivee1
- Qualifier
- both cultivated rice varieties and weedy rice strainse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results showed that both cultivated rice varieties and weedy rice strains were sensitive to pre-anthesis water stress for 9 days”
Claim · model-written summary
Leaf water potential and photosynthetic traits responded almost similarly in cultivated and weedy rice under water stress
- Taxon
- riceOryza sativat0
- Treatment
- water stresse2
- Outcome
- leaf water potential and photosynthetic traitse2
- Qualifier
- almost similare2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Almost similar responses to leaf water potential and photosynthetic traits were observed under water stress”
t0“Chlorophyll fluorescence parameters of cultivated (Oryza sativa L. ssp. indica) and weedy rice (Oryza sativa L. var. nivara) genotypes under water stress”
Claim · model-written summary
Minimum fluorescence (Fo) of the studied rice genotypes significantly increased under water stress
- Taxon
- riceOryza sativat0
- Treatment
- water stresse3
- Outcome
- minimum fluorescence (Fo)e3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The minimum fluorescence (Fo) of the studied genotypes significantly increased under water stress”
t0“Chlorophyll fluorescence parameters of cultivated (Oryza sativa L. ssp. indica) and weedy rice (Oryza sativa L. var. nivara) genotypes under water stress”
Claim · model-written summary
Maximum quantum yield (Fv/Fm) and maximum primary yield (Fv/Fo) of PS II significantly declined under water stress
- Taxon
- riceOryza sativat0
- Treatment
- Water stress conditione5
- Outcome
- maximum quantum yield (Fv/Fm) and maximum primary yield (Fv/Fo) of PS IIe4
- Direction
- declinede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“whereas the maximum quantum yield (Fv/Fm) and maximum primary yield (Fv/Fo) of PS II were significantly declined”
e5“Water stress condition (no water supplied) was then applied for 9 days prior to anthesis phase”
t0“Chlorophyll fluorescence parameters of cultivated (Oryza sativa L. ssp. indica) and weedy rice (Oryza sativa L. var. nivara) genotypes under water stress”
Claim · model-written summary
Water stress increased spikelet sterility to above 80% in all studied varieties and ecotypes
- Taxon
- riceOryza sativat0
- Treatment
- water stresse5
- Outcome
- spikelet sterilitye6
- Direction
- increasede6
- Value
- > 80%e6
- Qualifier
- in all studies varieties/ecotypee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Water stress condition (no water supplied) was then applied for 9 days prior to anthesis phase”
e6“which resulted in drastic increased spikelet sterility (> 80%) in all studies varieties/ecotype”
t0“Chlorophyll fluorescence parameters of cultivated (Oryza sativa L. ssp. indica) and weedy rice (Oryza sativa L. var. nivara) genotypes under water stress”
Claim · model-written summary
Weedy rice strains were more tolerant than cultivated rice varieties under water stress in maintaining chlorophyll fluorescence traits and spikelet sterility
Verbatim
e0“However, weedy rice strains were comparatively more tolerant under water stress condition than cultivated rice varieties, in respect to maintaining chlorophyll fluorescence traits and spikelet sterility”
e1“two weedy rice strains of Bertam and Ketara (Oryza sativa var. nivara) were grown in polybags”
Claim · model-written summary
Weedy rice Bertam and Ketara cannot be controlled by imposing water stress at reproductive growth stages
Verbatim
e0“indicating these two weedy rices, Bertam and Ketara, cannot be controlled by imposing water stress at reproductive growth stages”
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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.