Histological studies of the pre-penetration development and penetration of soybeans by rust, Phakopsora pachyrhizi Syd

Abstract

Comparisons were made between susceptible, resistant and highly resistant soybean lines of pre-penetration development and penetration of uredospores of rust, Phakopsora pachyrhizi, at intervals after inoculation. Differences between lines were found in the percentage of uredospores which germinated on leaves, and smaller differences were found between lines in appressorium formation and penetration from germinated uredospores. The differences between lines were not related to infection type.