Downy Mildew Disease of Crucifers: Biology, Ecology and Disease Management by Govind Singh Saharan Naresh Mehta & Prabhu Dayal Meena

Author:Govind Singh Saharan, Naresh Mehta & Prabhu Dayal Meena
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

The systemic invasion of the hypocotyls and cotyledons of cabbage seedlings may take place from the soil contaminated with oospores (LeBeau 1945). Further spread of the pathogen is by dissemination of conidia released from conidiophores formed on the cotyledons and hypocotyls (Chang et al. 1963). The pathogen can also enter directly through the inflorescence axis (Jang and Safeeulla 1990). The infection through the stigma and ovary wall results in embryonal infection.

Pathogenesis in a susceptible combination is accompanied by large increases in electrolyte leakage and increased activity of the enzymes , β-glucosidase, ribonuclease, and peroxidase (Kluczewski and Lucas 1982). The large increase in β-glucosidase originates from the pathogen, and the enhanced ribonuclease activity is due to a new post-infectional form of the enzyme. Infected B. juncea produce cellulase, indo-PMG, and endo-PG (Singh et al. 1980).

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.