Abstract
In Asian cultivated rice (Oryza sativa), distinct mechanisms to survive flooding are activated in two groups of varieties. Submergence-tolerant rice varieties possessing the SUBMERGENCE1A (SUB1A) gene display reduced growth during flash floods at the seedling stage and resume growth after the flood recedes, whereas deepwater rice varieties possessing the SNORKEL1 (SK1) and SNORKEL2 (SK2) genes display enhanced growth based on internodal elongation during prolonged submergence at the mature stage. In this study, we investigated the occurrence of these growth responses to submergence in the wild rice species Oryza grandiglumis, which is native to the Amazon floodplains. When subjected to gradual submergence, adult plants of O. grandiglumis accessions showed enhanced internodal elongation with rising water level and their growth response closely resembled that of deepwater varieties of O. sativa with high floating capacity. On the other hand, when subjected to complete submergence, seedlings of O. grandiglumis accessions displayed reduced shoot growth and resumed normal growth after desubmergence, similar to the response of submergence-tolerant varieties of O. sativa. Neither SUB1A nor the SK genes were detected in the O. grandiglumis accessions. These results indicate that the O. grandiglumis accessions are capable of adapting successfully to flooding by activating two contrasting mechanisms as the situation demands and that each mechanism of adaptation to flooding is not mediated by SUB1A or the SK genes.
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Abbreviations
- ABA:
-
Abscisic acid
- ERF:
-
Ethylene response factor
- FR13A:
-
Flood Resistant 13A
- GA:
-
Gibberellin
- HA II:
-
Habiganj Aman II
- QTL:
-
Quantitative trait locus
- SUB1:
-
SUBMERGENCE1
- SK1:
-
SNORKEL1
- SK2:
-
SNORKEL2
- TN1:
-
Taichung Native 1
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Acknowledgments
We thank Dr N. Mori (Kobe University, Japan) for providing seeds of FR13A. This work was supported by the Japan Society for the Promotion of Science KAKENHI (24580022 to T.A.).
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The authors declare that they have no conflict of interest.
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Okishio, T., Sasayama, D., Hirano, T. et al. Growth promotion and inhibition of the Amazonian wild rice species Oryza grandiglumis to survive flooding. Planta 240, 459–469 (2014). https://doi.org/10.1007/s00425-014-2100-8
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DOI: https://doi.org/10.1007/s00425-014-2100-8