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Preinfection behaviour of Phyllosticta musarum on banana leaves

文献类型： 外文期刊

作者： Pu, Jinji 1 ; Xie, Yixian 2 ; Zhang, Xin 2 ; Qi, Yangxiang 2 ; Zhang, Chunfa 1 ; Liu, Xiaomei 3 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biotechnol, Haikou 571101, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Hainan Key Lab Monitoring & Management Pests Trop, Environm & Plant Protect Inst, Danzhou 571737, Hainan, Peoples R China

3.S China Univ Trop Agr, Environm & Plant Protect Coll, Danzhou 571737, Hainan, Peoples R China

关键词： appressorial formation;preinfection behavior

期刊名称：AUSTRALASIAN PLANT PATHOLOGY （ 影响因子：1.599； 五年影响因子：1.708 ）

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收录情况： SCI

摘要： Light microscopy of the prepenetration process of Phyllosticta musarum, the banana freckle disease causal agent, on banana leaf was conducted. Germination of conidia started within 2-3 h after inoculation (AI) in a film of water at 25 degrees C. More than 50 and 90% of conidia germinated at 12 and 72 h AI at 25 degrees C, respectively. The germination of a conidium usually produced one germ tube, and occasionally two germ tubes, which were borne at the side of the conidium. However, only one germ tube developed into a mature appressorium. Appressoria were dark brown in colour and had different shapes. Most of them were round or slightly lobed. Appressorium formation initiated at 6 h AI, and the appressorial formation rate reached more than 50 and 80% at 24 and 48 h AI, respectively. A reddish-brown necrosis of host cells appeared under the appressoria as they were forming and was seen at 120 h AI. Most appressoria were formed in the grooves between adjacent epidermis cells. The pathogen seems to penetrate directly through the epidermal cuticle layer of the host by forming appressoria and infection pegs.

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