Stimulation of Oospore production in Phytophthora cinnamomi by Trichoderma species isolated from Eucalypt roots.

Johnson, G. C.; Heather, W. A.

doi:10.1071/app9820001

Cited by 1 publication

(1 citation statement)

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“…Reeves & Jackson (1972) suggested that the presence of T. viride and root material were imperative for P. cinnamomi to produce oospores in soil. T. viride and other oospore-inducing Trichoderma species are present in several Australian soils (Johnson & Heather 1982) including jarrah forest soils (Malajczuk & McComb 1979), but there are no reports in the literature of P. cinnamomi oospores either in jarrah forest soils or in soils of other native vegetation types of Australia. The only information on P. cinnamomi producing oospores in an Australian soil was obtained from studies conducted under laboratory conditions (Malajczuk & Theodorou 1979).…”

Section: Introductionmentioning

confidence: 99%

In planta selfing and oospore production of Phytophthora cinnamomi in the presence of Acacia pulchella

Jayasekera

McComb

Shearer

et al. 2007

Mycological Research

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This paper provides the first evidence of A2 type 1 and type 2 isolates of Phytophthora cinnamomi producing selfed oospores in planta in an Australian soil and in a potting mix. Oospores were observed in infected lupin (Lupinus angustifolius) roots incubated for 7 d either in the substrate under potted Acacia pulchella plants, or in soils collected from under and near varieties of A. pulchella in jarrah (Eucalyptus marginata) forest. The A2 type isolates varied in their ability to produce selfed oospores and none were produced by A1 isolates. The gametangial association was amphigynous and spores were predominantly spherical with diameters from 13-40 μm. The oospores were viable but dormant. Two A2 type isolates produced small numbers of selfed oospores with amphigynous antheridia axenically in Ribeiro's liquid medium within 30 d, and one A2 type 2 isolate produced oospores after mating with an A1 strain. Evidence is presented that the presence of roots of Acacia pulchella, and particularly A. pulchella var. glaberrima and var. goadbyi, enhances the production of oospores.

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