Effect of cytokinins on oxidative stress in tobacco plants under nitrogen deficiency

被引：56

作者：

Rubio-Wilhelmi, M. M. ^{[1
]}

Sanchez-Rodriguez, E. ^{[1
]}

Rosales, M. A. ^{[1
]}

Begona, Blasco ^{[1
]}

Rios, J. J. ^{[1
]}

Romero, L. ^{[1
]}

Blumwald, E. ^{[2
]}

Ruiz, J. M. ^{[1
]}

机构：

[1] Univ Granada, Fac Ciencias, Dept Plant Physiol, E-18071 Granada, Spain

[2] Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA

来源：

ENVIRONMENTAL AND EXPERIMENTAL BOTANY | 2011年 / 72卷 / 02期

关键词：

Cytokinins; Tobacco plants; Nitrogen deficiency; Oxidative stress; Antioxidant system; SUPEROXIDE-DISMUTASE; ANTIOXIDANT RESPONSES; ASCORBATE PEROXIDASE; HYDROGEN-PEROXIDE; LEAF SENESCENCE; EXPRESSION; ENZYMES; LEAVES; GLUTATHIONE; METABOLISM;

D O I：

10.1016/j.envexpbot.2011.03.005

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Wild type and transgenic tobacco plants expressing isopentenyltransferase, a gene coding the rate-limiting step in cytokinin synthesis, were grown under limited nitrogen (N) conditions. Our results indicated that the WT plants subjected to N deficiency displayed reduced biomass and relative growth rates, increased levels of oxidative damage and reduced foliar concentrations of the different N forms. However, the transgenic plants expressing P-SARK::IPT, in spite of showing a significant decline in all the N forms in the leaf, avoided the alteration of the oxidative metabolism and maintained biomass and the relative growth rates at control levels, under suboptimal N conditions. These results suggest that the increased cytokinin synthesis in the transgenic plants is an effective mechanism to improve N-use efficiency. (C) 2011 Elsevier BM. All rights reserved.

引用

页码：167 / 173

页数：7

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