Abstract
Rice plants are damaged during floods by complete or partial submergence. The pattern of expression of rice plant varies with different flood regimes. Accordingly, the morphological and physiological responses of rice genotypes were studied in field and pot experiments under different flood regimes. Wide genetic base lines of Oryza sativa and sub 1 introgressed submergence tolerant were compared in field experiments using principle component analysis. Further, based on internode elongation pattern, two genotypes - Bodikaburi and Pokkali - were selected for a pot experiment to find more on elongation pattern of internodes under different flood regimes. Short-term submergence in minimal water, elongation of blade, sheath, leaf area, DW, number of nodes in primary stem and survival present showed strong positive relationship with shoot length. Number of tillers, leaf area and DW were more affected and decreased during submergence than its non-submergence counterpart. Under different flooding regimes, cvv Bodikaburi and Pokkali exhibited different behaviour in the elongation pattern of the shoot. Partial submergence accelerated elongation of all internodes whereas complete submergence accelerated the top internode. Enhancement of shoot elongation during submergence in water is an escape strategy adopted by rice to resume aerobic metabolism and to improve carbon fixation. This escape strategy varies among genotypes with respect to different flooding regimes. Therefore, breeders should be aware of breeding of rice plants with suitable architecture for different flood- prone environments.
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Claims 8
Claim · model-written summary
Blade and sheath elongation, leaf area, dry weight, nodes, and survival were positively related to shoot length during short submergence.
- Taxon
- Rice
Oryza sativae1 - Organ / stage
- blade, sheathe0
- Treatment
- Short-term submergence in minimal watere0
- Outcome
- shoot lengthe0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short-term submergence in minimal water, elongation of blade, sheath, leaf area, DW, number of nodes in primary stem and survival present showed strong positive relationship with shoot length”
e1“Rice plants”
Claim · model-written summary
Tiller number decreased under submergence.
- Taxon
- RiceOryza sativae1
- Treatment
- submergencee0
- Outcome
- Number of tillerse0
- Direction
- decreasede0
- Comparator
- non-submergence counterparte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of tillers, leaf area and DW were more affected and decreased during submergence than its non-submergence counterpart”
e1“Rice plants”
Claim · model-written summary
Leaf area decreased under submergence.
- Taxon
- RiceOryza sativae1
- Treatment
- submergencee0
- Outcome
- leaf areae0
- Direction
- decreasede0
- Comparator
- non-submergence counterparte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of tillers, leaf area and DW were more affected and decreased during submergence than its non-submergence counterpart”
e1“Rice plants”
Claim · model-written summary
Dry weight decreased under submergence.
- Taxon
- RiceOryza sativae1
- Treatment
- submergencee0
- Outcome
- DWe0
- Direction
- decreasede0
- Comparator
- non-submergence counterparte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of tillers, leaf area and DW were more affected and decreased during submergence than its non-submergence counterpart”
e1“Rice plants”
Claim · model-written summary
Bodikaburi and Pokkali differed in shoot elongation pattern across flooding regimes.
- Taxon
- riceOryza sativae1
- Material
- Bodikaburi and Pokkalie0
- Outcome
- different behaviour in the elongation pattern of the shoote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under different flooding regimes, cvv Bodikaburi and Pokkali exhibited different behaviour in the elongation pattern of the shoot”
e1“rice genotypes”
Claim · model-written summary
Partial submergence accelerated elongation of all internodes.
- Taxon
- riceOryza sativae1
- Treatment
- Partial submergencee0
- Outcome
- elongation of all internodese0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Partial submergence accelerated elongation of all internodes”
e1“rice genotypes”
Claim · model-written summary
Complete submergence accelerated elongation of the top internode.
- Taxon
- riceOryza sativae1
- Treatment
- complete submergencee0
- Outcome
- top internodee0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“complete submergence accelerated the top internode”
e1“rice genotypes”
Claim · model-written summary
Breeders should select rice architecture appropriate to flood-prone environments.
- Taxon
- rice plantsOryza sativae0
- Outcome
- suitable architecture for different flood- prone environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“breeders should be aware of breeding of rice plants with suitable architecture for different flood- prone environments”
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