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

        Author
        Huang, Y. J.
        Toscano-Underwood, C.
        Fitt, Bruce D.L.
        Hu, X. J.
        Hall, A. M.
        Attention
        2299/10390
        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.
        Publication date
        2003-04
        Published in
        Plant Pathology
        Published version
        https://doi.org/10.1046/j.1365-3059.2003.00813.x
        Other links
        http://hdl.handle.net/2299/10390
        Relations
        School of Life and Medical Sciences
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