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dc.contributor.authorHuang, Yongju
dc.contributor.authorLi, Z. Q.
dc.contributor.authorEvans, Neal
dc.contributor.authorRouxel, T.
dc.contributor.authorFitt, Bruce D.L.
dc.contributor.authorBalesdent, Marie-Helene
dc.identifier.citationHuang , Y , Li , Z Q , Evans , N , Rouxel , T , Fitt , B D L & Balesdent , M-H 2006 , ' Fitness cost associated with loss of the AvrLm4 avirulence function in Leptosphaeria maculans (Phoma stem canker of oilseed rape) ' , European Journal of Plant Pathology , vol. 114 , no. 1 , pp. 77-89 .
dc.identifier.otherPURE: 816461
dc.identifier.otherPURE UUID: 64b162f7-9686-4cb3-a9d8-ec88709ff67a
dc.identifier.otherWOS: 000233867900008
dc.identifier.otherScopus: 28844457962
dc.description.abstractNear-isogenic isolates of Leptosphaeria maculans differing at the AvrLm4 avirulence locus (AvrLm4 or avrLm4) were produced in vitro. Methods for inoculation of leaves of oilseed rape with ascospores or conidia were compared. The 'ascospore shower' inoculation was the most efficient method for use when inoculum is limited (e.g. ascospores produced in vitro). It was used in controlled environments to compare fitness of AvrLm4 and avrLm4 isolates at 5, 10, 15, 20 or 25 degrees C on leaves of oilseed rape cultivars Eurol and Darmor lacking the resistance gene Rlm4, which corresponds to AvrLm4. At all temperatures tested, AvrLm4 ascospores produced more lesions than avrLm4 ascospores. The diameters of lesions produced by AvrLm4 ascospores were greater than those of lesions produced by avrLm4 ascospores. At 15-20 degrees C, more lesions initiated by AvrLm4 ascospores produced pycnidia than did lesions initiated by avrLm4 ascospores. However, there were no differences between AvrLm4 and avrLm4 isolates in incubation period (from inoculation to appearance of lesions) or rate of mycelial growth in leaves from lesions towards the stems. In field experiments with winter oilseed rape cultivars lacking Rlm4, the frequency of AvrLm4 isolates increased from 5.7% at the phoma leaf lesion stage (autumn) to 20.5% at the stem canker stage (summer) during 2002/2003 and from 7.9 to 11.5% during 2003/2004 growing seasons. Results of controlled environment and field experiments indicate that avrLm4 isolates have a fitness cost compared to AvrLm4 isolates.en
dc.relation.ispartofEuropean Journal of Plant Pathology
dc.titleFitness cost associated with loss of the AvrLm4 avirulence function in Leptosphaeria maculans (Phoma stem canker of oilseed rape)en
dc.contributor.institutionDepartment of Human and Environmental Sciences
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionHealth & Human Sciences Research Institute
dc.contributor.institutionCrop and Environmental Protection
dc.contributor.institutionGeography, Environment and Agriculture
dc.contributor.institutionAgriculture, Veterinary and Food Sciences
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Life and Medical Sciences
rioxxterms.typeJournal Article/Review

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