Phytophthora cinnamomi visible necrotic lesion-colonisation relationships in native flora

作者：Shearer B L^*; Crane C E

来源：Australasian Plant Pathology, 2012, 41(6): 633-644.

DOI：10.1007/s13313-012-0151-5

• Phytophthora cinnamomi
• Visible necrotic lesion
• Colonisation
• Integrated adaptive disease management
• Host susceptibilities
• Symptomless
• Asymptomatic
• Environments
• Phosphite fungicide treatments
• Hemibiotroph
• Biotroph
• Necrotroph
• South-West Botanical Province ofWestern Australia

Relationships were examined between visible necrotic lesion and colonisation following stem wound inoculated of native plant species of the South-West Botanical Province of Western Australia with Phytophthora cinnamomi. Relationships were determined over a wide range of biotic and abiotic environments of plant taxa, host susceptibility, isolate, phosphite fungicide spray, native community and glasshouse environments, seasons and soil types. Consistent significant relationships were found between necrotic lesions and colonisation over the different environments. Visible necrotic lesions were either in-phase with or greater than colonisation in 55 % of the environments analysed. ANCOVA interactions of total visible necrotic lesion with treatments were not significant for 10 out of 14 interactions, indicating homogeneity of slopes in the majority of cases. Rather than having distinct hemibiotrophic stages, P. cinnamomi switches between necrotic lesions and colonisation of symptomless tissue depending on environmental conditions. Average necrotic lesion/taxa in stems following wound inoculation was significantly positively correlated with mortality following soil inoculation. Determination of visible necrotic lesion was 10 times quicker and 30 times cheaper than colonisation, giving considerable savings for large experiments. Quantification of necrotic lesion-colonisation relationships aids determination of mechanisms of pathogen invasion and host resistance.

• 出版日期2012