Erwinia mallotivora is the causal agent of papaya bacterial crown rot disease in Lampung Timur, Indonesia

摘要

Sixteen bacterial strains showing oval, convex with a white colony colour were obtained from the?water-soaked lesions on the?petioles and leaves of?infected papaya (cv. calina) collected from a papaya field in?Lampung Timur, Indonesia. The?pathogenicity test showed that?all the?strains produced the?same symptoms with those found in?the field. Four representative strains were then chosen for?further investigation. The?phenotypic characteristics revealed that?the?strains resembled Erwinia mallotivora. Two representative strains were further identified using a 16SrDNA sequence analysis. The?result showed that?the strains were placed within the?group of?the type strain and the?reference strains of?E. mallotivora. To?the best of?our knowledge, this is the?first finding of?E. mallotivora as?the causal agent of?papaya crown rot disease in?Indonesia. Among the?sixteen plants used for?the host range test, the?symptom was?only observed on eggplants, but not on the?other fifteen plant species.