Abstract
Grain growth, translocation of assimilates to the ear and photosynthesis are important processes to contribute to the formation of grain during the period of grain-filling in cereal crops. The objective of this investigation was to identify, for rice, which of these three proecesses is most affected by the water stress developed in grain-filling Perlod. We grew rice plants (Oryza Sativa, L. cv. Nipponbare) singly in 4 litter pots under outdoor conditions. The pots were kept flooded untill 15 days after anthesis. Then we transferred plants in a vinyl-covered house and stopped watering half the plants (deslccated). The rest of the plants were kept watered (control). Just before treatment, plants had their tillers removed to have four culms of approximately the same age. Plant water status was determined in terms of relative water content (RWC), being supplemented by measurements of the stomatal aperture and the transpiration rate. Plants were harvested before and after treatment, and dry weight was determined for unhuIled rices, rachis, top internode, lower internodes, leaf blades, leaf sheaths, crowns and roots. Progressive decline in RWC was more evident in plants subjected to soil desiccation. The change in stomatal aperture and transpiration rate with time also indicate that more severe stress developed in desiccated plants. But, there was little difference in dry weight increase in unhulled rice over 10 day period between control and desiccated plants, though the increase of total dry matter was reduced significantly in desiccated plants. This was accompanied by the greater decrease in dry weight of non-grain parts in desiccated plants. We therefore conclude that the water stress during the rapid growth of grain has little effect on grain growth as well as translocation in rice, while it reduces the rate of dry matter production considerably.
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Claims 6
Claim · model-written summary
Soil desiccation produced a more evident progressive decline in rice relative water content.
- Taxon
- Rice
Oryza sativat0 - Treatment
- soil desiccatione0
- Outcome
- RWCe0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Progressive decline in RWC was more evident in plants subjected to soil desiccation”
t0“Rice”
Claim · model-written summary
Stomatal aperture and transpiration changes indicated more severe stress in desiccated plants.
- Taxon
- RiceOryza sativat0
- Outcome
- stomatal aperture and transpiration ratee0
- Qualifier
- more severe stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The change in stomatal aperture and transpiration rate with time also indicate that more severe stress developed in desiccated plants”
t0“Rice”
Claim · model-written summary
Unhulled rice dry weight increase differed little between desiccated and control plants over 10 days.
- Taxon
- riceOryza sativae0
- Treatment
- desiccated plantse0
- Outcome
- dry weight increase in unhulled ricee0
- Direction
- little differencee0
- Qualifier
- over 10 day periode0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was little difference in dry weight increase in unhulled rice over 10 day period between control and desiccated plants”
Claim · model-written summary
Total dry matter increase was significantly reduced in desiccated plants.
- Taxon
- RiceOryza sativat0
- Treatment
- desiccated plantse0
- Outcome
- increase of total dry mattere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of total dry matter was reduced significantly in desiccated plants”
t0“Rice”
Claim · model-written summary
Non-grain parts lost more dry weight in desiccated plants.
- Taxon
- RiceOryza sativat0
- Treatment
- desiccated plantse0
- Outcome
- dry weight of non-grain partse0
- Direction
- greater decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater decrease in dry weight of non-grain parts in desiccated plants”
t0“Rice”
Claim · model-written summary
Authors conclude water stress has little effect on rice translocation during rapid grain growth.
- Taxon
- riceOryza sativae0
- Outcome
- translocatione0
- Qualifier
- little effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stress during the rapid growth of grain has little effect on grain growth as well as translocation in rice”
The same questions in other papers
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