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Histopathology of Blackleg Development in Spring Rapeseed
Author(s) -
Xi K.,
Morrall R. A. A.
Publication year - 1993
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1993.tb01322.x
Subject(s) - biology , hypha , leptosphaeria maculans , rapeseed , cultivar , botany , blackleg , brassica
Abstract Hyphae of Leptosphaeria maculans were observed in all types of above‐ground tissue of two cultivars of Spring rapeseed plants exposed to natural infection. Large quantities of hyphae were distributed in the epidermis and cortex of the stem in symptomless plants at early growth stages, irrespective of resistance level of the cultivar. These results verified the extensive latent infection early in the season that had been detected by isolation in a previous study. Two types of hyphae occurred in plants: narrow hyphae (2.1 μm diam.) were usually found in symptomless plants at early growth stages, whereas thick hyphae (5.7 μm diam.) occurred in plants with symptoms as the late stages of growth. Resistance mechanisms were evidenced by the presence of heavily stained material and disintegration of the hyphae in cells of the resistant cultivar.