Cold Stress-Induced Acclimation in Rice is Mediated by Root-Specific Aquaporins
| Autor: | Junko Ishikawa-Sakurai, Mari Murai-Hatano, Arifa Ahamed, Matsuo Uemura, Yukio Kawamura, Hidehiro Hayashi |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Osmosis
Physiology Acclimatization Aquaporin Plant Science Aquaporins Plant Roots Gene Expression Regulation Plant Xylem Gene expression Cold acclimation Plant Proteins Regulation of gene expression Chemistry Cold-Shock Response fungi Water food and beverages Oryza Cell Biology General Medicine Cold shock response Cold Temperature Horticulture Shoot Plant Shoots Signal Transduction |
| Zdroj: | Plant and Cell Physiology. 53:1445-1456 |
| ISSN: | 1471-9053 0032-0781 |
| DOI: | 10.1093/pcp/pcs089 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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