Abstract
Water deficits at the anthesis stage of rice (Oryza sativa L.) induce a high percentage of spikelet sterility and reduce grain yield. This study attempted to elucidate the direct effects of water stress on panicle exsertion, spikelet opening, and spikelet desiccation leading to spikelet sterility. A well-watered treatment and two water stress levels were imposed in pot-grown plants of IRAT 13 (upland cultivar) and IR20 (lowland cultivar) at the time of flowering under greenhouse conditions A cultivar difference was observed in the flowering response to water stress with a high sensitivity in IR20. The time course of panicle exsertion showed an inhibitory effect due to the low panicle water status. Low panicle water potentials significantly reduced the number of opened spikelets. Spikelet opening was completely inhibited at panicle water potentials below −1·8 MPa and −2·3 MPa in IR20 and IRAT 13, respectively. However, the peak spikelet opening time in a day was not influenced by the stress treatment. Spikelets in stressed panicles were observed to remain open for a longer period than in the well-watered panicles. The role of turgor in spikelet opening is also discussed in the study. At low panicle water potentials, severe desiccation of spikelets and anthers was noted. The deleterious effects of water deficits on spikelet opening and spikelet water loss contributed to reduced spikelet fertility
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Claims 11
Claim · model-written summary
Water deficit at anthesis induced a high percentage of spikelet sterility in rice.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- anthesis stagee0
- Treatment
- Water deficits at the anthesis stagee0
- Outcome
- percentage of spikelet sterilitye0
- Direction
- inducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e0“Water deficits at the anthesis stage of rice (Oryza sativa L.) induce a high percentage of spikelet sterility and reduce grain yield”
Claim · model-written summary
Water deficit at anthesis reduced grain yield of rice.
- Taxon
- riceOryza sativae0
- Organ / stage
- anthesis stagee0
- Treatment
- Water deficits at the anthesis stagee0
- Outcome
- grain yielde0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e0“Water deficits at the anthesis stage of rice (Oryza sativa L.) induce a high percentage of spikelet sterility and reduce grain yield”
Claim · model-written summary
IR20 showed a high sensitivity of its flowering response to water stress.
- Taxon
- RiceOryza sativat0
- Material
- IR20e1
- Treatment
- water stresse1
- Outcome
- flowering responsee1
- Direction
- high sensitivitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e1“A cultivar difference was observed in the flowering response to water stress with a high sensitivity in IR20”
Claim · model-written summary
Low panicle water status had an inhibitory effect on panicle exsertion.
- Taxon
- RiceOryza sativat0
- Treatment
- low panicle water statuse1
- Outcome
- panicle exsertione1
- Direction
- inhibitory effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e1“The time course of panicle exsertion showed an inhibitory effect due to the low panicle water status”
Claim · model-written summary
Low panicle water potentials significantly reduced the number of opened spikelets.
- Taxon
- RiceOryza sativat0
- Treatment
- Low panicle water potentialse2
- Outcome
- number of opened spikeletse2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e2“Low panicle water potentials significantly reduced the number of opened spikelets”
Claim · model-written summary
Spikelet opening in IR20 was completely inhibited below -1.8 MPa panicle water potential.
- Taxon
- RiceOryza sativat0
- Material
- IR20e3
- Treatment
- panicle water potentialse3
- Outcome
- Spikelet openinge3
- Direction
- completely inhibitede3
- Value
- −1·8 MPae3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e3“Spikelet opening was completely inhibited at panicle water potentials below −1·8 MPa and −2·3 MPa in IR20 and IRAT 13, respectively”
Claim · model-written summary
Spikelet opening in IRAT 13 was completely inhibited below -2.3 MPa panicle water potential.
- Taxon
- RiceOryza sativat0
- Material
- IRAT 13e3
- Treatment
- panicle water potentialse3
- Outcome
- Spikelet openinge3
- Direction
- completely inhibitede3
- Value
- −2·3 MPae3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e3“Spikelet opening was completely inhibited at panicle water potentials below −1·8 MPa and −2·3 MPa in IR20 and IRAT 13, respectively”
Claim · model-written summary
Peak spikelet opening time in a day was not influenced by the stress treatment.
- Taxon
- RiceOryza sativat0
- Treatment
- stress treatmente4
- Outcome
- peak spikelet opening time in a daye4
- Direction
- not influencede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e4“However, the peak spikelet opening time in a day was not influenced by the stress treatment”
Claim · model-written summary
Spikelets in stressed panicles stayed open for a longer period than in well-watered panicles.
- Taxon
- RiceOryza sativat0
- Treatment
- stressed paniclese5
- Outcome
- remain open for a longer periode5
- Direction
- longere5
- Comparator
- well-watered paniclese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e5“Spikelets in stressed panicles were observed to remain open for a longer period than in the well-watered panicles”
Claim · model-written summary
Severe desiccation of spikelets and anthers occurred at low panicle water potentials.
- Taxon
- RiceOryza sativat0
- Organ / stage
- spikelets and antherse6
- Outcome
- desiccation of spikelets and antherse6
- Qualifier
- severee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e6“At low panicle water potentials, severe desiccation of spikelets and anthers was noted”
Claim · model-written summary
The authors propose that deleterious effects of water deficits on spikelet opening and water loss contributed to reduced spikelet fertility.
- Taxon
- RiceOryza sativat0
- Treatment
- water deficitse7
- Outcome
- reduced spikelet fertilitye7
- Qualifier
- deleterious effects of water deficits on spikelet opening and spikelet water losse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flowering Response of Rice to Water Stress at Anthesis”
e7“The deleterious effects of water deficits on spikelet opening and spikelet water loss contributed to reduced spikelet fertility”
The same questions in other 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
- negative
- 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.