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Sexuality type change from self-induction to cross-induction in Phyophthora boehmeriae

Published online by Cambridge University Press:  01 September 1997

Y. C. ZHOU
Affiliation:
Department of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
X. B. ZHENG
Affiliation:
Department of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
J. Y. LU
Affiliation:
Department of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
W. H. KO
Affiliation:
Department of Plant Pathology, Beaumont Agricultural Research Center, University of Hawaii at Manoas, Hilo, HI 96720, U.S.A.
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Abstract

When isolate NIOI of self-inducing Phytophthora boehmeriae was grown on medium containing the fungicide ethazol, the fungus produced oospore-free sectors from which self-sterile cultures were recovered. Self-sterile cultures were also recovered from three of six other isolates tested. Single hyphal fragment cultures and single zoospore cultures derived from these self-sterile cultures were of A1A2, A1, A2, and A0 types. Conversion of self-fertile species of Phytophthora to A1 and A2 types is suggested as another possible evolutionary origin of the two sexes in lower organisms, in addition to previously reported mating type change as a possible origin of sexes.

Type
Research Article
Copyright
The British Mycological Society 1997

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