Abstract
Water stress occurring during the early phase of the reproductive growth stage may influence plant reproduction success. The objectives of this study were to evaluate the responses of pollen and seed yield components to water stress during anthesis in cultivated rice (Oryza sativa L.) varieties and weedy rice strains. Studies were conducted in 2007 using three cultivated rice varieties; MR 84, MR 219 and MR 232. In 2008 three weedy rice strains were obtained from Seberang Perak, Kuala Pilah and Tanjung Karang areas. Studies were conducted in the field where plants were grown in polybags and submerged in polyethylene tanks. Prior to anthesis, plants were subjected to water stress by taking the plants out of the polyethylene tanks for five days. Flag leaf relative water content (RWC) and relative injury (RI) were measured daily during the stressed period. Pollen production and pollen viability were measured upon re-watering. Seed yield components measured were grain number per panicle, 100-grain weight, percentage filled grain and percentage spikelet sterility at harvest. Water stress caused a 13 – 34% decline in the number of pollen grains per anther in cultivated varieties but increased pollen production in weedy strains. Percentage pollen viability declined by 40 – 45% in MR 219 and MR 232, but increased by 15% in MR 84 when plants were water-stressed. Percent pollen viability in weedy strains never exceeded 52% and significantly declined with water stress. For cultivated varieties, water stress increased total number of grain per panicle by 31%. In weedy strains, only Seberang Perak increased in the number of grain per panicle due to water stress. Spikelet sterility was relatively higher in cultivated varieties (16 – 50%) compared with weedy strains (10 – 23%). The 100-grain weight was not affected by water stress in both cultivated varieties and weedy strains. This study indicated that weedy rice strains would gain a competitive advantage by producing more filled grains when water deficit occurs during anthesis.
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Claims 11
Claim · model-written summary
Water stress reduced pollen grains per anther in cultivated rice by 13 – 34%.
- Taxon
- rice
Oryza sativat0 - Treatment
- Water stresse0
- Outcome
- number of pollen grains per anthere0
- Direction
- declinee0
- Value
- 13 – 34%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress caused a 13 – 34% decline in the number of pollen grains per anther in cultivated varieties”
t0“cultivated and weedy rice”
Claim · model-written summary
Water stress increased pollen production in weedy rice.
Not reportedComparator
Verbatim
e0“but increased pollen production in weedy strains.”
t0“water-stressed cultivated and weedy rice”
Claim · model-written summary
Pollen viability declined by 40 – 45% in stressed MR 219 and MR 232.
- Taxon
- riceOryza sativat0
- Material
- MR 219 and MR 232e0
- Treatment
- water-stressedt0
- Outcome
- Percentage pollen viabilitye0
- Direction
- declinede0
- Value
- 40 – 45%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percentage pollen viability declined by 40 – 45% in MR 219 and MR 232”
t0“water-stressed cultivated and weedy rice”
Claim · model-written summary
Pollen viability rose by 15% in stressed MR 84.
- Taxon
- riceOryza sativat0
- Material
- MR 84e0
- Treatment
- water-stressede0
- Outcome
- Pollent0
- Direction
- increasede0
- Value
- 15%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but increased by 15% in MR 84 when plants were water-stressed.”
t0“Pollen and seed yield components of water-stressed cultivated and weedy rice”
Claim · model-written summary
Weedy rice pollen viability never exceeded 52%.
Verbatim
e0“Percent pollen viability in weedy strains never exceeded 52%”
t0“cultivated and weedy rice”
Claim · model-written summary
Water stress significantly reduced weedy rice pollen viability.
Not reportedComparator
Verbatim
e0“Percent pollen viability in weedy strains never exceeded 52% and significantly declined with water stress.”
t0“cultivated and weedy rice”
Claim · model-written summary
Water stress increased cultivated rice grain number per panicle by 31%.
- Taxon
- riceOryza sativat0
- Treatment
- water stresse0
- Outcome
- total number of grain per paniclee0
- Direction
- increasede0
- Value
- 31%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For cultivated varieties, water stress increased total number of grain per panicle by 31%.”
t0“cultivated and weedy rice”
Claim · model-written summary
Among weedy strains, only Seberang Perak increased grain number per panicle under water stress.
- Taxon
- weedy ricet0
- Material
- Seberang Perake0
- Treatment
- water stresse0
- Outcome
- number of grain per paniclee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“In weedy strains, only Seberang Perak increased in the number of grain per panicle due to water stress.”
t0“cultivated and weedy rice”
Claim · model-written summary
Cultivated rice had higher spikelet sterility than weedy rice.
- Taxon
- riceOryza sativat0
- Outcome
- Spikelet sterilitye0
- Direction
- highere0
- Value
- 16 – 50%e0
- Qualifier
- 10 – 23%e0
- Comparator
- weedy strainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spikelet sterility was relatively higher in cultivated varieties (16 – 50%) compared with weedy strains (10 – 23%).”
t0“cultivated and weedy rice”
Claim · model-written summary
Water stress did not affect 100-grain weight in either rice group.
- Taxon
- cultivated and weedy ricet0
- Treatment
- water stresse0
- Outcome
- 100-grain weighte0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“The 100-grain weight was not affected by water stress in both cultivated varieties and weedy strains.”
t0“cultivated and weedy rice”
Claim · model-written summary
The authors inferred weedy rice gains a competitive advantage through more filled grains under anthesis drought.
Verbatim
e0“weedy rice strains would gain a competitive advantage by producing more filled grains when water deficit occurs during anthesis.”
The same questions in other papers
drought · yield · Oryza sativa (rice)Positive and negative results
75 papers in the same direction as this paper · 246 in the opposite direction · 3 reporting no difference from an alternative
- negative
- 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.