期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 170, 期 2, 页码 220-224出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2012.09.012
关键词
Maize; Salt stress; ABA; IBA; IAA; Auxin; Growth
资金
- DFG [ZO118/6]
The plant hormones abscisic acid (ABA) and auxin (IAA, IBA) play important roles in plant responses to environmental stresses such as salinity. Recent breeding improvements in terms of salt resistance of maize have lead to a genotype with improved growth under saline conditions. By comparing this salt-resistant hybrid with a sensitive hybrid, it was possible to show differences in hormone concentrations in expanding leaves and roots. In response to salinity, the salt-resistant maize significantly increased IBA concentrations in growing leaves and maintained IAA concentration in roots. These hormonal adaptations may help to establish favorable conditions for growth-promoting agents such as beta-expansins and maintain growth of resistant maize hybrids under salt stress. Moreover, ABA concentrations significantly increased in resistant maize leaves under salt stress, which may contribute to acidifying the apoplast, which in turn is a prerequisite for growth. (C) 2012 Elsevier GmbH. All rights reserved.
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