Effects of temperature on ascospore germination and penetration of oilseed rape (Brassica napus ) leaves by A- or B-group Leptosphaeria maculans (phoma stem canker)

A - Papers appearing in refereed journals

Huang, Y-J., Toscano-Underwood, C., Fitt, B. D. L., Hu, X. J. and Hall, A. M. 2003. Effects of temperature on ascospore germination and penetration of oilseed rape (Brassica napus ) leaves by A- or B-group Leptosphaeria maculans (phoma stem canker). Plant Pathology. 52 (2), pp. 245-255.

AuthorsHuang, Y-J., Toscano-Underwood, C., Fitt, B. D. L., Hu, X. J. and Hall, A. M.
Abstract

Ascospores of both A-group and B-group Leptosphaeria maculans germinated at temperatures from 5 to 20degreesC on leaves of oilseed rape. Germination of ascospores of both groups started 2 h after inoculation and percentage germination reached its maximum about 14 h after inoculation at all temperatures. Both the percentage of A-/B-group ascospores that had germinated after 24 h incubation and germ tube length increased with increasing temperature from 5 to 20degreesC. Germ tubes from B-group ascospores were longer than those from A-group ascospores at all temperatures, with the greatest difference at 20degreesC. Hyphae from ascospores of both groups penetrated the leaves predominantly through stomata, at temperatures from 5 to 20degreesC. A-group ascospores produced highly branched hyphae that grew tortuously, whereas B-group ascospores produced long, straight hyphae. The percentage of germinated ascospores that penetrated stomata increased with increasing temperature from 5 to 20degreesC and was greater for A-group than for B-group L. maculans after 40 h incubation.

KeywordsAgronomy; Plant Sciences
Year of Publication2003
JournalPlant Pathology
Journal citation52 (2), pp. 245-255
Digital Object Identifier (DOI)doi:10.1046/j.1365-3059.2003.00813.x
Open accessPublished as non-open access
Funder project or code424
507
ISSN00320862
PublisherWiley

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