香蕉假植苗肾形线虫病的发生与病原鉴定

Occurrence and identification of reniform nematode disease of banana seedling

据调查,福建省漳州市香蕉组培假植苗普遍遭受肾形线虫侵染.通过观察形态特征,该病原线虫被鉴定为肾状肾形线虫,这是国内首次发现该线虫侵染香蕉组培假植苗.肾形线虫以未成熟雌虫侵染香蕉幼嫩的根组织,虫体前部插入皮层取食,后部在根组织外发育肥大;香蕉肾形线虫成熟雌虫通常为半内寄生,有时完全埋生于根组织内;受侵染的香蕉假植苗根系萎缩、变黑腐烂,地上部植株矮小、生长不良.

Investigation of disease on banana seedling in Zhangzhou,Fujian showed that banana seedling was seriously infected by reniform nematode.The pathogenetic nematode was identified as Rotylenchulus reniformis based on morphological characteristics,and banana seedling infected by R.reniformis was first reported in China.Immature female was the infective stage of reniform nematode.On penetration,only the anterior part of the body embedded within the cortical tissue of root,and the posterior part of the body swelled to form a typical kidney-shape out of the root tissue;the mature female of R.reniformis on banana was semi-endoparasite,but sometimes,it could be completely wrapped in root tissue;the infected root of banana seedling was atrophic,black and rotton,and aboveground of the plant was stunted and hypogenetic.