Abstract
Water stress during the early phase of the reproductive growth stage is a major constraint to yield of rice. The objective of this study was to evaluate the effect of pre-anthesis water stress on pollen quality of cultivated varieties and weedy rice strains. Two widely cultivated Malaysian varieties of MR219 and MR232 (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 10 days prior to anthesis phase. Plastic polybags (40 x 45 cm) were placed in an enclosed cage and arranged as completely randomized design with four replicates. Pollen quality traits were then determined such as pollen production, pollen viability and pollen load on stigma. The number of spikelets panicle-1 was also measured. Scanning Electron Microscopy was used to evaluate the morphology. Water stress reduced the pollen quality traits like pollen grain production, pollen viability and pollen load on stigma equally in both cultivated and weedy rice genotypes, resulting poor spikelet fertility and spikelet production. Observation of fluorescence microscopy indicated that water stress clearly affects pollen germination and pollen tube growth in both cultivated and weedy rice. Reduction of pollen viability and vigour appear to be the cause of reduction in pollen germinability and retardation in pollen tube growth, resulting poor fertilization and poor spikelets production in both cultivated and weedy rice genotypes under water stress. Weedy rice strains were comparatively more tolerant under water stress condition than cultivated rice varieties due to maintaining pollen quality traits. This suggests that weedy rices, Bertam and Ketara, may not heavily be influenced by water stress at reproductive growth stages.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Water stress reduced pollen production, pollen viability and pollen load on the stigma equally in cultivated and weedy rice.
- Taxon
- rice
Oryza sativae0 - Treatment
- Water stresse0
- Outcome
- pollen grain production, pollen viability and pollen load on stigmae0
- Direction
- reducede0
- Qualifier
- equally in both cultivated and weedy rice genotypese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress reduced the pollen quality traits like pollen grain production, pollen viability and pollen load on stigma equally in both cultivated and weedy rice genotypes, resulting poor spikelet fertility and spikelet production”
Claim · model-written summary
Water stress resulted in poor spikelet fertility and spikelet production in rice.
- Taxon
- riceOryza sativae0
- Treatment
- Water stresse0
- Outcome
- spikelet fertilitye0
- Direction
- poore0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress reduced the pollen quality traits like pollen grain production, pollen viability and pollen load on stigma equally in both cultivated and weedy rice genotypes, resulting poor spikelet fertility and spikelet production”
Claim · model-written summary
Water stress clearly affected pollen germination and pollen tube growth in cultivated and weedy rice.
- Taxon
- riceOryza sativae1
- Treatment
- water stresse1
- Outcome
- pollen germination and pollen tube growthe1
- Direction
- affectse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Observation of fluorescence microscopy indicated that water stress clearly affects pollen germination and pollen tube growth in both cultivated and weedy rice”
Claim · model-written summary
Weedy rice strains were more tolerant to water stress than cultivated rice varieties.
Verbatim
e3“Weedy rice strains were comparatively more tolerant under water stress condition than cultivated rice varieties due to maintaining pollen quality traits”
Claim · model-written summary
Reduced pollen viability and vigour appear to cause reduced pollen germinability and retarded pollen tube growth in rice.
- Taxon
- riceOryza sativae2
- Outcome
- reduction in pollen germinability and retardation in pollen tube growthe2
- Qualifier
- Reduction of pollen viability and vigoure2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Reduction of pollen viability and vigour appear to be the cause of reduction in pollen germinability and retardation in pollen tube growth, resulting poor fertilization and poor spikelets production in both cultivated and weedy rice genotypes under water stress”
Claim · model-written summary
Weedy rice may not be heavily influenced by water stress at reproductive growth stages.
Verbatim
e4“This suggests that weedy rices, Bertam and Ketara, may not heavily be influenced by water stress at reproductive growth stages”
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.