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Dynamics of growth regulators during infection of apple leaves by Alternaria alternata apple pathotype

文献类型： 外文期刊

作者： Chen, Y.;Zhang, C.;Cong, P.

作者机构：

关键词： In vitro inoculation;Plant pathogen interaction

期刊名称： AUSTRALASIAN PLANT PATHOLOGY

ISSN： 0815-3191

年卷期： 2012 年 41 卷 3 期

页码：

收录情况： SCI

摘要： Alternaria blotch of apple caused by Alternaria alternata apple pathotype has a severe negative effect on apple production. It can cause tissue necrosis on leaves, young shoots and fruit. Recent studies on this pathogen have mostly focused on phytotoxicity and pathogenicity. There are few reports on the roles of signaling and metabolism in the process of infection. In this paper, a filial generation with substantial differences in resistance between individuals with similar genetic background was used as a host. An aggressive strain of A. alternate, that can complete the infection process 72 h after inoculation, served as the pathogen. A reproducible and reliable in vitro inoculation system for plant growth regulator determination was established to overcome the difficulties of inoculation of attached leaves. Alterations in growth regulator concentrations were detected, including indole-3-acetic acid (IAA), zeatin riboside (ZR), gibberellin A(3) (GA(3)), abscissic acid (ABA) and the polyamines, putrescine (Put), spermidine (Spd) and spermine (Spm). Results indicated the plant growth regulators interacted with each other to modulate signaling and metabolic networks. A biotrophic-like phase was inferred to exist before necrosis developed. Gibberellin A(3) and ABA appeared to be involved in the phase transformation from the biotrophic-like stage to the necrotrophic stage. Cytokinin, Put and Spd appeared to be related to disease resistance. This study advances our knowledge of the pathological mechanisms of Alternaria blotch on apple and provides useful resources for development of disease control and prevention.

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