Cold Stress-Induced Acclimation in Rice is Mediated by Root-Specific Aquaporins
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説明
Cold acclimation process plays a vital role in the survival of chilling- and freezing-tolerant plants subjected to cold temperature stress. However, it remains elusive whether a cold acclimation process enhances root water uptake (a component of chilling tolerance) in chilling-sensitive crops such as rice. By analyzing the root hydraulic conductivity under cold stress for a prolonged time, we found that cold stress induced a gradual increase in root osmotic hydraulic conductivity [Lp(r(os))]. Compared with the control treatment (roots and shoots at 25°C), low root temperature (LRT) treatment (roots at 10°C; shoots at 25°C) dramatically reduced Lp(r(os)) within 1 h. However, Lp(r(os)) gradually increased during prolonged LRT treatment and it reached 10-fold higher values at day 5. Moreover, a coordinated up-regulation of root aquaporin gene expression, particularly OsPIP2;5, was observed during LRT treatment. Further, comparison of aquaporin gene expression under root-only chilling (LRT) and whole-plant chilling conditions, and in the roots of intact plants vs. shootless plants, suggests that a shoot to root signal is necessary for inducing the expression of aquaporin genes in the root. Collectively, these results demonstrate that a cold acclimation process for root water uptake functions in rice and is possibly regulated through aquaporins.
収録刊行物
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- Plant and cell physiology
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Plant and cell physiology 53 (8), 1445-1456, 2012-08
Kyoto : Japanese Society of Plant Physiologists
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詳細情報 詳細情報について
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- CRID
- 1521417754997865088
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- NII論文ID
- 10031052682
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- NII書誌ID
- AA0077511X
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- ISSN
- 00320781
- 14719053
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- NDL書誌ID
- 023897119
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- PubMed
- 22711693
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- 本文言語コード
- en
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- NDL 雑誌分類
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- ZR3(科学技術--生物学--植物)
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