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pathogenicity of Cell Wall Degrading Enzymes Produced by botryodiplodia theobromae pat. against Mangoes

Agricultural Biotechnology 2012年第6期1卷 18-21页

作者： Min LI Zhaoyin GAO Meijiao HU Shuo ZHOU Dongping YANG Bo YANG Jianxue YI Fengzhen YANG Environment and Plant Protection Research Institute CATAS Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests Hainan Engineering Research Center for Biological Control of Diseases and Pests on Tropical Crops College of Environment and Plant Protection Hainan University

[ Objective ] This study aimed to confirm the roles of cell wall degrading enzymes （CWDEs） produced by botryodiplodia theobromae pat. in the infec- tion of mango fruits. [ Method] Change of activities of five types of CWDEs produced by B. theobromae pat. were studied under both in vitro culture and inocula- tion conditions, along with the pathogenicity and the ability of producing CWDEs of four post-harvest fangal pathogens（B, theobromae pat. , Colletotrichum gloeos- porioides Penz. , Phomopsis mangiferae Ahmad and Dothiorella dominicana Pet. et Cif. ） which cause stem-end rot of mangoes. [ Result] B. theobromae pat. was a- ble to produce polygalacturonase（PG）, pectinmethylgalacturonase（PMG）, polygalacturonic acid trans-eliminase （PGTE）, pectin methyltrans-eliminase （PMTE） and cellulase （ Cx. ） under both in vitro culture and inoculation conditions, of which activities of PG, Cx and PMG were significantly higher in than that in either PGTE or PMTE. Among three primary CWDEs, the peak of activities of PG and Cx appeared earlier and that of PMG occured later. The pathogenicity of B. theo- bromae pat. was significantly higher than that of any other three pathogens; it is the same with the abilities of producing pectinase. [ Conclusion] This paper pro- vides theoretical bases for further exploring the mechanism of host-pathogen interaction and decreasing the post-harvest loss of mango fruits.

关键词： botryodiplodia theobromae pat cell wall degrading enzymes(CWDEs) pathogenicity

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