Abstract
Drought stress has now become a severe threat to ensure food security in the developing world as well as in Malaysia. To dertermine physiological and molecular determinants of drought stress and screeneng of drought tollarent rice varieties, an experiment was conducted in a greenhouse at Universiti Putra Malaysia using eleven rice varieties and two irrigation regimes (well irrigated and water stressed). The present study indicated that traditional rice variety Puteh Perak and Siam is superior drought tolerant while IRRI 2011- IRLON Plot no: 064, MR 220 and BRRI Dhan 56 are moderately drought tolerant and IRRI 2011- IRLON Plot no: 050 and MR 84 are drought sensitive rice variety. Drought tolerance of those varieties were measured based on rate of tiller reduction, leaf rolling score and drought score during water stress condition. Leaf rolling score was positively correlated to drought score, chlorophyll content and proline accumulation. Significant increase in the proline accumulation and antioxidant enzyme activities (peroxidase and catalase) were also observed under drought stress in all the rice varieties except Siam and Puteh Perak. All the rice varieties including drought tolerant and sensitive variety showed the existence of OsLEA 30 genes.
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Claims 7
Claim · model-written summary
Puteh Perak and Siam were superior drought tolerant varieties.
- Taxon
- rice
Oryza sativae0 - Outcome
- drought tolerante0
- Direction
- superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“traditional rice variety Puteh Perak and Siam is superior drought tolerant”
Claim · model-written summary
Three named varieties were moderately drought tolerant.
- Outcome
- moderately drought tolerante0
Not reportedTaxon
Verbatim
e0“IRRI 2011- IRLON Plot no: 064, MR 220 and BRRI Dhan 56 are moderately drought tolerant”
Claim · model-written summary
Two named varieties were drought sensitive.
- Taxon
- riceOryza sativae0
- Outcome
- drought sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IRRI 2011- IRLON Plot no: 050 and MR 84 are drought sensitive rice variety”
Claim · model-written summary
Leaf rolling score was positively correlated with drought score, chlorophyll content and proline accumulation.
- Outcome
- Leaf rolling scoree0
- Direction
- positively correlatede0
- Comparator
- drought score, chlorophyll content and proline accumulatione0
Not reportedTaxon
Verbatim
e0“Leaf rolling score was positively correlated to drought score, chlorophyll content and proline accumulation”
Claim · model-written summary
Drought significantly increased proline accumulation except in Siam and Puteh Perak.
- Taxon
- riceOryza sativae0
- Treatment
- drought stresse0
- Outcome
- proline accumulatione0
- Direction
- increasee0
- Qualifier
- except Siam and Puteh Perake0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant increase in the proline accumulation and antioxidant enzyme activities (peroxidase and catalase) were also observed under drought stress in all the rice varieties except Siam and Puteh Perak”
Claim · model-written summary
Drought significantly increased peroxidase and catalase activity except in Siam and Puteh Perak.
- Taxon
- riceOryza sativae0
- Treatment
- drought stresse0
- Outcome
- antioxidant enzyme activities (peroxidase and catalase)e0
- Direction
- increasee0
- Qualifier
- except Siam and Puteh Perake0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant increase in the proline accumulation and antioxidant enzyme activities (peroxidase and catalase) were also observed under drought stress in all the rice varieties except Siam and Puteh Perak”
Claim · model-written summary
OsLEA 30 genes occurred in all rice varieties.
- Taxon
- riceOryza sativae0
- Gene
- OsLEA 30 genese0
- Outcome
- existence of OsLEA 30 genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the rice varieties including drought tolerant and sensitive variety showed the existence of OsLEA 30 genes”
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