Study on the infection mechanism of apple ring rot disease
LI Guang-xu
SHEN Yong-bo
GAO Yan-min
CHEN Jie
Jie Youl Uhm
Abstract：Apple ring rot pathogen (Botryosphaeria berengriana f. sp piricola) can produce a series of pectinases in vitro and in vivo, including polygalacturonase(PG), polymethylgalacturonase (PMG), polygalacturonic acid transeliminase (PGTE) and pectin methyltranseliminase(PMTE). Among them, PG and PMG are major enzymes to degrade fruit cell wall and play an important role in pathogenesis. Results suggested that PG activity increased constantly during pathogen infection, while PMG was more active at the early infection period. Both pectinases might be involved in relevant change in reducing sugars in the inoculated fruit skin. The difference in pH between inoculated and non-inoculated fruit skin gradually became smaller in the process of pathogen infection, and at 40 d after inoculation the pH in inoculated tissue became lower than in healthy tissues. The pH change might facilitate PG and PMG actions and hasten cell wall softened. From 10 to 20 d after inoculation, PG activity and reducing sugar released from tissue increased more quickly than other stages. The histological study of pathogen showed that pectinases produced from pathogen served as important pathogenetic agents throughout infection process.
Keywords：Apple ring rot(Botryosphaeria berengriana f. sp. piricola)PectinasesInfection mechanism
Publication Date：2007-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 16-20 )