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Characterisation of accessions and species of Macadamia to stem infection by Phytophthora cinnamomi

Akinsanmi, O. A. and Neal, J. and Drenth, A. and Topp, B. (2016) Characterisation of accessions and species of Macadamia to stem infection by Phytophthora cinnamomi. Plant Pathology . ISSN 00320862

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Article Link(s): http://dx.doi.org/10.1111/ppa.12566

Abstract

Phytophthora cinnamomi is a major pathogen in most macadamia plantations worldwide. Due to stem lesions, stem cankers and leaf defoliation it results in loss of productivity and tree death. In this study we examined accessions of the four Macadamia species and their hybrids, produced via rooted stem cuttings or germinated seeds, for susceptibility to stem canker and necrotic lesion caused by P. cinnamomi. Plants were wound-inoculated with agar containing P. cinnamomi. The symptoms produced in inoculated plants were used to characterize host susceptibility variation within and among the population. Lesion lengths and severity of stem canker were recorded. The four species and hybrids differed significantly in stem canker severity (P < 0.001) and lesion length (P = 0.04). M. integrifolia and M. tetraphylla hybrids were the most susceptible. M. integrifolia had the greatest stem canker severity and the most extensive lesions above and below the site of inoculation. Restricted lesion sizes were observed in M. ternifolia and M. jansenii. The effects of basal stem diameter and the method of propagation either from cuttings or seed were not significant. The genetic variation in the reactions of macadamia accessions to stem infection by P. cinnamomi is discussed.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Host resistance Oomycetes proteaceae soilborne pathogen tree nut wild germplasm
Subjects:Plant culture > Tree crops
Plant culture > Food crops
Plant pests and diseases
Plant pests and diseases > Plant pathology
Deposited On:13 Jun 2016 02:57
Last Modified:13 Jun 2016 02:57

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