Journal article
The wheat ABA hypersensitive ERA8 mutant is associated with increased preharvest sprouting tolerance and altered hormone accumulation
Euphytica, Vol.212(2), pp.229-245
11/2016
Handle:
https://hdl.handle.net/2376/116694
Abstract
Wheat preharvest sprouting (PHS) is the germination of mature grain on the mother plant when rain occurs before harvest. Higher abscisic acid (ABA) hormone levels and sensitivity are associated with higher seed dormancy and PHS tolerance. Consistent with this, the ABA hypersensitive ENHANCED RESPONSE TO ABA8 (ERA8) mutant resulted in increased dormancy and PHS tolerance in soft white spring wheat ‘Zak’. ERA8 seeds were initially less responsive to germination-rescue by the hormone gibberellin (GA). ERA8 gained GA and lost ABA sensitivity more slowly than wild-type during dormancy loss through after-ripening and cold imbibition. This study examined if increased ABA sensitivity in ERA8 likely resulted from increased ABA signaling or increased ABA hormone levels. Zak ERA8 had higher initial grain dormancy although endogenous embryo ABA levels were similar in Zak ERA8 and wild-type, suggesting that increased dormancy was due to increased ABA signaling rather than increased ABA accumulation. ABA levels declined with Zak ERA8 after-ripening, suggesting that ABA turnover is not defective. Elevated ERA8 dormancy was also associated with increased embryonic jasmonic acid-Ile and aleurone indole-3-acetic acid (IAA) levels. The possible implication that other plant hormones may influence wheat seed dormancy and germination are discussed.
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Details
- Title
- The wheat ABA hypersensitive ERA8 mutant is associated with increased preharvest sprouting tolerance and altered hormone accumulation
- Creators
- Shantel Martinez - Molecular Plant Sciences, Department of Crop and Soil Sciences Washington State University Pullman WA 99164-6420 USAKeiko Tuttle - Molecular Plant Sciences, Department of Crop and Soil Sciences Washington State University Pullman WA 99164-6420 USAYumiko Takebayashi - RIKEN Centre for Sustainable Resource Science Yokohama Kanagawa 230-0045 JapanMitsunori Seo - RIKEN Centre for Sustainable Resource Science Yokohama Kanagawa 230-0045 JapanKimberly Campbell - USDA-ARS Wheat Genetics, Quality, Physiology and Disease Research Unit Washington State University Pullman WA 99164-6420 USACamille Steber - USDA-ARS Wheat Genetics, Quality, Physiology and Disease Research Unit Washington State University Pullman WA 99164-6420 USA
- Publication Details
- Euphytica, Vol.212(2), pp.229-245
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- Springer Netherlands; Dordrecht
- Grant note
- 1209878 / National Science Foundation (US) Washington Grain Alliance U.S. Department of Agriculture (http://dx.doi.org/10.13039/100000199) Japanese Society for the Promotion of Science
- Identifiers
- 99900548458001842
- Language
- English
- Resource Type
- Journal article