Control of homothallic oospore formation in Phytophthora parasitica by culture manipulations

Tsao, Peter H.; Ugale, Richard; Hobbs, Susan K.; Farih, A.

doi:10.1016/s0007-1536(80)80207-5

Cited by 14 publications

(9 citation statements)

References 16 publications

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“…Brasier (1 972) showed that the ability of aged cultures of certain self-sterile isolates of Phytophthora to form oospores around the inoculum or in sectors in subcultures usually disappeared after one or two transfers. Such oospore-forming ability could be extended if inoculum was obtained from an area containing oospores (Savage et al, 1968;Tsao et al, 1980). A similar phenomenon was observed in this study when the A' and A2 mating types of P .…”

Section: Discussionsupporting

confidence: 83%

“…Previous reports (Brasier, 1972;Kamjaipai & Ui, 1978;Tsao et a/., 1980) showed that after long-term storage, certain isolates of cross-inducing ('heterothallic') species of Phytophthora behaved like a self-inducing ('homothallic') type by producing oospores in sectors or around the initial inocula in single cultures. A similar phenomenon was observed when the A*, but not A', mating type of Phytophthora capsici was grown for 21 d on agar medium containing chloroneb (Noon & Hickman, 1974).…”

Section: Introductionmentioning

confidence: 99%

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Reversible Change of Mating Type in Phytophthora parasitica

1981

Microbiology

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In addition to the original mating type, the opposite mating type appeared in the zoospore population of single isolates of Phytophthora parasitica after long-term storage or chloroneb treatment. Occasionally self-fertile zoospores were also detected, but their self-induction nature was transitory and unstable. Both hormone production and hormone reception were changed in the sexual variants. The results explain the apparent change from cross-induction ('heterothallic') to self-induction ('homothallic') in P. parasitica after long-term storage and chloroneb treatment, and suggest one possible evolutionary origin of sex in the lower fungi.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Reversible Change of Mating Type in Phytophthora parasitica

1981

Microbiology

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“…The isolates were heterothallic, although inoculum transferred from old cultures developed amphigynous and oval antheridia, with smooth and spherical oogonia and aplerotic oospores (Fig. 1) as previously reported (Brasier, 1972;Tsao et al, 1980). Terminal and intercalary globose chlamydospores were also observed.…”

supporting

confidence: 81%

First report of root rot caused by Phytophthora nicotianae in avocado trees (Persea americana) in Cuba

Machado

Collazo

Peña

et al. 2013

New Disease Reports

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“…Brasier et al 2003 observed chimaeric self-fertility in P. inundata, this behaviour being lost during continued subculturing. Tsao et al (1980) suggested a chemical induction of selfing in P. parasitica old cultures by substances produced by the pathogen. The mating type switch observed for a particular P. ramorum A2 isolate is compatible with previous studies which showed that A2 isolates are less stable than A1 isolates and could become self-fertile in culture (Erwin and Ribeiro 1996).…”

Section: Resultsmentioning

confidence: 99%

Change of Mating Type in an EU1 Lineage Isolate of Phytophthora ramorum

Chandelier

Heungens²,

Werres

2013

Journal of Phytopathology

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All Phytophthora ramorum EU1 lineage isolates tested are of A1 mating type, except for three rare isolates from 2002 to 2003 from Belgium, which were originally assigned the A2 mating type. In one of these isolates (2338), a switch from A2 to A1 mating type was observed in 2006. This observation initiated a larger study in which all cultures and subcultures of the original three EU1 A2 isolates, maintained in three laboratories under different storage conditions, were checked for mating type change. The A2 to A1 mating type switch was observed in four of seven independently maintained isolates that were derived from isolate 2338 in two laboratories, using different transfer regimes and storage conditions. Following the mating type switch to A1 in these four derived isolates, no reversion back to A2 mating was observed, even after up to 5 years of additional isolate maintenance and several more subculturing events. The three other isolates that were derived from isolate 2338 as well as the other EU1 A2 isolates collected in 2002 and 2003 and stored in the same conditions did not display such mating type change. The potential causes of the mating type conversions as well as their epidemiological implications are discussed.

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Control of homothallic oospore formation in Phytophthora parasitica by culture manipulations

Cited by 14 publications

References 16 publications

Reversible Change of Mating Type in Phytophthora parasitica

Reversible Change of Mating Type in Phytophthora parasitica

First report of root rot caused by Phytophthora nicotianae in avocado trees (Persea americana) in Cuba

Change of Mating Type in an EU1 Lineage Isolate of Phytophthora ramorum

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