Institute of Biology, Botany, University Leipzig, Johannisalle 21-23, 04103 Leipzig, Germany.
J Plant Physiol. 2013 Jan 15;170(2):220-4. doi: 10.1016/j.jplph.2012.09.012. Epub 2012 Nov 20.
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 β-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.
植物激素脱落酸（ABA）和生长素（IAA、IBA）在植物对盐度等环境胁迫的反应中发挥着重要作用。最近在玉米耐盐性方面的培育改良导致了一种在盐度条件下生长良好的基因型。通过比较这种耐盐杂种与敏感杂种，可以观察到在扩展叶片和根系中激素浓度的差异。在盐胁迫下，耐盐玉米显著增加了生长叶片中的 IBA 浓度，并保持了根系中的 IAA 浓度。这些激素适应可能有助于为生长促进剂（如β-扩展素）建立有利条件，并在盐胁迫下维持耐盐玉米杂种的生长。此外，在盐胁迫下，耐盐玉米叶片中的 ABA 浓度显著增加，这可能有助于酸化质外体，而酸化质外体是生长的前提条件。
