총 616페이지

South Wales, as well as from State fungaria (the Victorian Plant Pathology Herbarium
(VPRI), the Queensland Plant Pathology Herbarium (BRIP) and the NSW Plant Pathology
Collection(DAR).
ThestudyidentifiedsixColletotrichumspeciesinfectingAustraliancitrus.Oneoftheseisa
newspecies?Colletotrichumaustralianum?namedafterthecountrywherethepathogen
wasfirstidentified.
The other three Colletotrichum species, C. theobromicola, C. karstii and C. siamense, have
been recorded as pathogens of a broad range of plants in Australia (including coffee,
jackfruitandfig)butneverpreviouslyassociatedwithcitrusanthracnose.Itisalsothefirst
time that C. theobromicola has been reported anywhere in the world as a pathogen of
citrus.
TheresultsrevisecurrentthoughtaboutthediversityofColletotrichumspeciesthatcause
anthracnose of citrus in Australia. Among the four species that have been previously
reportedaspathogensassociatedwithcitrusanthracnoseinAustralia,onlyC.fructicolaand
C.gloeosporioideswerefoundinthisstudy.
By comparing selected gene sequences of all the Colletotrichum samples, in combination
withtheirmorphologicalcharacteristicsandpathogenicity,weconfirmedthatCollettorichum
gloeosporioideswasthepathogenmostfrequentlyfoundondiseasedcitrusbranches,leaves
andfruit.
However, as the most frequently identified fungus may not be the most aggressive in
causing disease, the next step is to test the virulence of Colletotrichum species among
differentcitrusspeciesonboththetreesandfruit.
By gaining a better understanding of the Colletotrichum species that cause anthracnose,
both within Australia and overseas, an efficient control plan such as development of
advancedmoleculardiagnostictools(qPCR)fordetectingsmalltracesofpathogensinplant
material, can be applied to mitigate the risk of disease and therefore better protect
Australis’scitrusindustry.
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