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The enhanced drought tolerance of rice plants under ammonium is related to aquaporin (AQP).

Ding, Lei and Gao, Cuimin and Li, Yingrui and Li, Yong and Zhu, Yiyong and Xu, Guohua and Shen, Qirong and Kaldenhoff, Ralf and Kai, Lei and Guo, Shiwei (2015):
The enhanced drought tolerance of rice plants under ammonium is related to aquaporin (AQP).
In: Plant science : an international journal of experimental plant biology, pp. 14-21, 234, ISSN 1873-2259,
[Article]

Abstract

Previously, we demonstrated that drought resistance in rice seedlings was increased by ammonium (NH4(+)) treatment, but not by nitrate (NO3(-)) treatment, and that the change was associated with root development. To study the effects of different forms of nitrogen on water uptake and root growth under drought conditions, we subjected two rice cultivars (cv. 'Shanyou 63' hybrid indica and cv. 'Yangdao 6' indica, China) to polyethylene glycol-induced drought stress in a glasshouse using hydroponic culture. Under drought conditions, NH4(+) significantly stimulated root growth compared to NO3(-), as indicated by the root length, surface area, volume, and numbers of lateral roots and root tips. Drought stress decreased the root elongation rate in both cultivars when they were supplied with NO3(-), while the rate was unaffected in the presence of NH4(+). Drought stress significantly increased root protoplast water permeability, root hydraulic conductivity, and the expression of root aquaporin (AQP) plasma intrinsic protein (PIP) genes in rice plants supplied with NH4(+); these changes were not observed in plants supplied with NO3(-). Additionally, ethylene, which is involved in the regulation of root growth, accumulated in rice roots supplied with NO3(-) under conditions of drought stress. We conclude that the increase in AQP expression and/or activity enhanced the root water uptake ability and the drought tolerance of rice plants supplied with NH4(+).

Item Type: Article
Erschienen: 2015
Creators: Ding, Lei and Gao, Cuimin and Li, Yingrui and Li, Yong and Zhu, Yiyong and Xu, Guohua and Shen, Qirong and Kaldenhoff, Ralf and Kai, Lei and Guo, Shiwei
Title: The enhanced drought tolerance of rice plants under ammonium is related to aquaporin (AQP).
Language: English
Abstract:

Previously, we demonstrated that drought resistance in rice seedlings was increased by ammonium (NH4(+)) treatment, but not by nitrate (NO3(-)) treatment, and that the change was associated with root development. To study the effects of different forms of nitrogen on water uptake and root growth under drought conditions, we subjected two rice cultivars (cv. 'Shanyou 63' hybrid indica and cv. 'Yangdao 6' indica, China) to polyethylene glycol-induced drought stress in a glasshouse using hydroponic culture. Under drought conditions, NH4(+) significantly stimulated root growth compared to NO3(-), as indicated by the root length, surface area, volume, and numbers of lateral roots and root tips. Drought stress decreased the root elongation rate in both cultivars when they were supplied with NO3(-), while the rate was unaffected in the presence of NH4(+). Drought stress significantly increased root protoplast water permeability, root hydraulic conductivity, and the expression of root aquaporin (AQP) plasma intrinsic protein (PIP) genes in rice plants supplied with NH4(+); these changes were not observed in plants supplied with NO3(-). Additionally, ethylene, which is involved in the regulation of root growth, accumulated in rice roots supplied with NO3(-) under conditions of drought stress. We conclude that the increase in AQP expression and/or activity enhanced the root water uptake ability and the drought tolerance of rice plants supplied with NH4(+).

Journal or Publication Title: Plant science : an international journal of experimental plant biology
Volume: 234
Divisions: 10 Department of Biology
10 Department of Biology > Applied Plant Sciences
Date Deposited: 30 Mar 2015 13:05
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