Abstract
The main strategies enabling rice plants to cope with flash flooding stress require growth regulation during submergence and subsequent rapid growth recovery after de-submergence. The objective of this study was to characterize the response of 56 diverse contrasting rice genotypes to submergence and their recovery following de-submergence. Among these genotypes, nine lines had been developed for anaerobic germination and submergence tolerance (AG + Sub1) by IRRI. Fourteen-day-old plants were submerged completely in water for 7 days. Subsequently, the plants were kept under normal rice-cultivation conditions as the control for a further period of 5 days. The tested genotypes were generally classified into three clusters based on shoot elongation rate of submerged to non-submerged treatments (ratio) during submergence period and chlorophyll contents during recovery period using Ward's method. The genotypes in clusters I include most of AG + Sub1 lines and tolerant genotype FR13A adapted to submergence stress, which get the benefits of quiescence mechanism during submergence coupled with maintenance of higher chlorophyll content during recovery period. In contrast, the cluster III spanned most of intolerant genotypes such as IR42 by enhancing shoot elongation through escape mechanism in response to submergence. This mechanism negatively affected the plant growth recovery due to a great reduction of chlorophyll contents during the recovery period. The genotypes placed in cluster II followed the similar trend as cluster I during the submergence and recovery periods in addition of increases in shoot fresh weight during submergence period. This finding suggests that other mechanisms along with quiescence might be associated with submergence stress in the genotypes placed in cluster II. In conclusion, the contrasting rice genotypes expressed differential growth responses in genotypes with lower shoot elongation ratio using different quiescence strategies during submergence period.
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Claims 8
Claim · model-written summary
Rice genotypes formed three clusters based on shoot elongation ratio and recovery chlorophyll.
- Taxon
- rice
Oryza sativat0 - Outcome
- classified into three clusterse0
- Value
- three clusterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tested genotypes were generally classified into three clusters based on shoot elongation rate of submerged to non-submerged treatments (ratio) during submergence period and chlorophyll contents during recovery period using Ward's method.”
t0“rice genotypes”
Claim · model-written summary
Cluster I included most AG + Sub1 lines and FR13A adapted to submergence.
- Taxon
- riceOryza sativat0
- Material
- AG + Sub1 linese0
- Outcome
- adapted to submergence stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genotypes in clusters I include most of AG + Sub1 lines and tolerant genotype FR13A adapted to submergence stress”
t0“rice genotypes”
Claim · model-written summary
Cluster I maintained higher chlorophyll during recovery after submergence.
- Taxon
- riceOryza sativat0
- Material
- AG + Sub1 linese1
- Organ / stage
- recovery periode0
- Outcome
- chlorophyll contente0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quiescence mechanism during submergence coupled with maintenance of higher chlorophyll content during recovery period.”
e1“The genotypes in clusters I include most of AG + Sub1 lines”
t0“rice genotypes”
Claim · model-written summary
Cluster III intolerant genotypes such as IR42 increased shoot elongation under submergence.
- Taxon
- riceOryza sativat0
- Material
- IR42e0
- Treatment
- submergencee0
- Outcome
- shoot elongatione0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cluster III spanned most of intolerant genotypes such as IR42 by enhancing shoot elongation through escape mechanism in response to submergence.”
t0“rice genotypes”
Claim · model-written summary
Cluster III rice genotypes showed reduced chlorophyll during recovery.
- Taxon
- riceOryza sativat0
- Material
- IR42e1
- Outcome
- chlorophyll contentse0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This mechanism negatively affected the plant growth recovery due to a great reduction of chlorophyll contents during the recovery period.”
e1“cluster III spanned most of intolerant genotypes such as IR42”
t0“rice genotypes”
Claim · model-written summary
Cluster III rice genotypes had impaired plant growth recovery.
- Taxon
- riceOryza sativat0
- Material
- IR42e1
- Outcome
- plant growth recoverye0
- Direction
- negatively affectede0
- Qualifier
- great reduction of chlorophyll contentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This mechanism negatively affected the plant growth recovery due to a great reduction of chlorophyll contents during the recovery period.”
e1“cluster III spanned most of intolerant genotypes such as IR42”
t0“rice genotypes”
Claim · model-written summary
Cluster II rice genotypes increased shoot fresh weight during submergence.
- Taxon
- riceOryza sativat0
- Material
- cluster IIe0
- Treatment
- submergencee0
- Outcome
- shoot fresh weighte0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genotypes placed in cluster II followed the similar trend as cluster I during the submergence and recovery periods in addition of increases in shoot fresh weight during submergence period.”
t0“rice genotypes”
Claim · model-written summary
Cluster II rice genotypes may use mechanisms besides quiescence in submergence stress.
- Taxon
- riceOryza sativat0
- Material
- cluster IIe0
- Outcome
- submergence stresse0
- Qualifier
- other mechanisms along with quiescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“other mechanisms along with quiescence might be associated with submergence stress in the genotypes placed in cluster II.”
t0“rice genotypes”
The same questions in other papers
flooding · growth · Oryza sativa (rice)Positive and negative results
63 papers in the same direction as this paper · 72 in the opposite direction · 2 reporting no difference from an alternative
- positive
- negative
- no effect
134 papers more in this group
See all 138 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.