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        Resistance of Malus domestica fruit to Botrytis cinerea depends on endogenous ethylene biosynthesis

        Author
        Akagi, A.
        Stotz, Henrik
        Dandekar, A.M.
        Attention
        2299/10070
        Abstract
        The plant hormone ethylene regulates fruit ripening, other developmental processes, and a subset of defense responses. Here, we show that 1-aminocyclopropane-1-carboxylic acid synthase (ACS)-silenced apple (Malus domestica) fruit that express a sense construct of ACS were more susceptible to Botrytis cinerea than untransformed apple, demonstrating that ethylene strengthens fruit resistance to B. cinerea infection. Because ethylene response factors (ERFs) are known to contribute to resistance against B. cinerea via the ethylene-signaling pathway, we cloned four ERF cDNAs from fruit of M. domestica: MdERF3,-4,-5, and-6. Expression of all four MdERF mRNAs was ethylene dependent and induced by wounding or by B. cinerea infection. B. cinerea infection suppressed rapid induction of wound-related MdERF expression. MdERF3 was the only mRNA induced by wounding and B. cinerea infection in ACS-suppressed apple fruit, although its induction was reduced compared with wild-type apple. Promoter regions of all four MdERF genes were cloned and putative cis-elements were identified in each promoter. Transient expression of MdERF3 in tobacco increased expression of the GCC-box containing gene chitinase 48.
        Publication date
        2011-11-01
        Published in
        Phytopathology
        Published version
        https://doi.org/10.1094/PHYTO-03-11-0087
        Other links
        http://hdl.handle.net/2299/10070
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