| Autor: |
Inada, Mayumi, Ueda, Akihiro, Weiming Shi, Takabe, Tetsuko |
| Předmět: |
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| Zdroj: |
Planta: An International Journal of Plant Biology; Jan2005, Vol. 220 Issue 3, p395-402, 8p |
| Abstrakt: |
Regulation of ion homeostasis is fundamental to physiological activities in plants. Here, we report on the functional characterization of AcPMP3 [Aneurolepidiumchinense(a monocotyledonous halophyte)plasmamembraneprotein3] under salt stress. Expression ofAcPMP3-1andAcPMP3-2genes was highly induced by various abiotic stresses, such as salt, cold and drought. Furthermore, abscisic acid, H2O2 and salicylic acid also triggered expression ofAcPMP3genes. In the?nha1 ?pmr2?pmp3yeast mutant, which lacks the major Na+ efflux systems (Na+/H+ antiporter and Na+-ATPase), its salt-sensitive phenotype was restored by expressing theAcPMP3-1gene, and the transformants accumulated lesser amounts of Na+ and K+ than mutant cells under 50 mM NaCl and 500 mM KCl conditions, respectively. These results suggested that AcPMP3-1 plays a role as a regulator of both Na+ and K+ accumulation in the cells. In situ hybridization showed that theAcPMP3-1transcript was localized in cells of the root cap and root epidermis, which strongly suggested that AcPMP3-1 is essential for regulating Na+/K+ transportation between plant roots and the outer environment under salt stress. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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