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Carbon regulation of environmental pH by secreted small molecules that modulate pathogenicity in phytopathogenic fungi

文献类型： 外文期刊

作者： Bi, Fangcheng 1 ; Barad, Shiri 1 ; Ment, Dana 1 ; Luria, Neta 1 ; Dubey, Amit 1 ; Casado, Virginia; Glam, Nofar 1 ; Di 1 ;

作者机构： 1.Agr Res Org, Volcani Ctr, Dept Postharvest Sci Fresh Produce, IL-50250 Bet Dagan, Israel

2.Guangdong Acad Agr Sci, Inst Fruit Tree Res, Guangzhou 510640, Guangdong, Peoples R China

3.Minist Agr, Key Lab South Subtrop Fruit Biol & Genet Resource, Guangzhou 510640, Guangdong, Peoples R China

4.Hebrew Univ Jerusalem, Dept Plant Pathol & Microbiol, Robert H Smith Fac Agr Food & Environm, IL-76100 Rehovot, Israel

5.Hebrew Univ Jerusalem, Dept Plant Pathol & Microbiol, Robert H Smith Fac A

关键词： carbon regulation of pathogenicity;pathogenicity;pH regulation

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.663； 五年影响因子：5.626 ）

ISSN：

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收录情况： SCI

摘要： Fruit pathogens can contribute to the acidification or alkalinization of the host environment. This capability has been used to divide fungal pathogens into acidifying and/or alkalinizing classes. Here, we show that diverse classes of fungal pathogensColletotrichum gloeosporioides, Penicillium expansum, Aspergillus nidulans and Fusarium oxysporumsecrete small pH-affecting molecules. These molecules modify the environmental pH, which dictates acidic or alkaline colonizing strategies, and induce the expression of PACC-dependent genes. We show that, in many organisms, acidification is induced under carbon excess, i.e. 175 mm sucrose (the most abundant sugar in fruits). In contrast, alkalinization occurs under conditions of carbon deprivation, i.e. less than 15 mm sucrose. The carbon source is metabolized by glucose oxidase (gox2) to gluconic acid, contributing to medium acidification, whereas catalysed deamination of non-preferred carbon sources, such as the amino acid glutamate, by glutamate dehydrogenase 2 (gdh2), results in the secretion of ammonia. Functional analyses of gdh2 mutants showed reduced alkalinization and pathogenicity during growth under carbon deprivation, but not in high-carbon medium or on fruit rich in sugar, whereas analysis of gox2 mutants showed reduced acidification and pathogencity under conditions of excess carbon. The induction pattern of gdh2 was negatively correlated with the expression of the zinc finger global carbon catabolite repressor creA. The present results indicate that differential pH modulation by fruit fungal pathogens is a host-dependent mechanism, affected by host sugar content, that modulates environmental pH to enhance fruit colonization.

  • 相关文献

[1]How Does Host Carbon Concentration Modulate the Lifestyle of Postharvest Pathogens during Colonization?. Prusky, Dov B.,Barad, Shiri,Bi, Fangcheng,Moral, Juan. 2016

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[3]Mutation of AREA affects growth, sporulation, nitrogen regulation, and pathogenicity in Colletotrichum gloeosporioides. Bi, Fangcheng,Meng, Xiangchun,Bi, Fangcheng,Meng, Xiangchun,Bi, Fangcheng,Meng, Xiangchun,Bi, Fangcheng,Ment, Dana,Luria, Neta,Prusky, Dov.

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[7]The pH modulation by fungal secreted molecules: a mechanism affecting pathogenicity by postharvest pathogens. Prusky, Dov,Barad, Shiri,Ment, Dana,Bi, Fangcheng,Bi, Fangcheng.

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