title: The influence of salt stress on ABA and auxin concentrations in two maize cultivars differing in salt resistance.
abstract: 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.
authors.affiliation: Institute of Biology, Botany, University Leipzig, Johannisalle 21-23, 04103 Leipzig, Germany. Christian.zoerb@uni-leipzig.de
authors.forename: Christian
authors.initials: C
authors.lastname: Zörb
authors.forename: Christoph-Martin
authors.initials: CM
authors.lastname: Geilfus
authors.forename: Karl H
authors.initials: KH
authors.lastname: Mühling
authors.forename: Jutta
authors.initials: J
authors.lastname: Ludwig-Müller
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D014644:Genetic Variation; D005838:Genotype; D007210:Indoleacetic Acids / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000378:metabolism*; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000254:growth & development / Q000378:metabolism; D054712:Salinity; D055051:Salt-Tolerant Plants / Q000235:genetics* / Q000378:metabolism; D012965:Sodium Chloride / Q000378:metabolism; D013312:Stress, Physiological; D003313:Zea mays / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism*
chemical_list: D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D012965:Sodium Chloride; D000040:Abscisic Acid