EI-Korany, A. (2002). OCCURRENCE OF THE SELF-FERTILE PHENOTYPE OF Phytophthora infestans IN EL-BEHERA GOVERNORATE, EGYPT. Journal of Plant Protection and Pathology, 27(11), 7845-7853. doi: 10.21608/jppp.2002.256047
A. E. EI-Korany. "OCCURRENCE OF THE SELF-FERTILE PHENOTYPE OF Phytophthora infestans IN EL-BEHERA GOVERNORATE, EGYPT". Journal of Plant Protection and Pathology, 27, 11, 2002, 7845-7853. doi: 10.21608/jppp.2002.256047
EI-Korany, A. (2002). 'OCCURRENCE OF THE SELF-FERTILE PHENOTYPE OF Phytophthora infestans IN EL-BEHERA GOVERNORATE, EGYPT', Journal of Plant Protection and Pathology, 27(11), pp. 7845-7853. doi: 10.21608/jppp.2002.256047
EI-Korany, A. OCCURRENCE OF THE SELF-FERTILE PHENOTYPE OF Phytophthora infestans IN EL-BEHERA GOVERNORATE, EGYPT. Journal of Plant Protection and Pathology, 2002; 27(11): 7845-7853. doi: 10.21608/jppp.2002.256047
OCCURRENCE OF THE SELF-FERTILE PHENOTYPE OF Phytophthora infestans IN EL-BEHERA GOVERNORATE, EGYPT
Dept. of Agric. Bot., Fac. of Agric, Damanhour, Alex. Univ.
Abstract
A survey for the self-fertile phenotype of Phytophthora infestans was conducted during the 1999·2001 growing seasons. Blighted potato were sampled from fields in different localities (EI-Rahmania, Housh Eissa, Kafr EI·Dawar, and Kafr EI-Zayat) in EI·Behera Governorate and the surrounding area where isolates of . P.infestans were recovered. Out of 23 P.infestans isolates made in the first year (1999), only one isolate was self·fertile (SF). In the second year (2000), one more SF isolate was detected among 50 P.infestans isolates, while in the third year (2001 ) three isolates out of 172 were SF. That constituted 4.3%,2%, and 1.7% for the three years of the study, respectively. Propagations made from single sporangia and single hyphal tips of the recovered SF isolates segregated A 1, A2, and few SF colonies. This
supported the view that self-fertility in P.infestans was a mixture of A 1 and A2 mating types hyphae that interacted to form SF colonies and later segregated where new strains of P.infestans could be evolved. The low frequency of the SF isolates (2%) revealed in the present study with its high percentage of oospore abortion (15.3%), low viability (2.4%), and germination (1.8%) may indicate that the threat posed by the interaction between A 1 and A2 mating type isolates is real. The potential for the time being could be undetectable. However, creation of new more vigorous strains via this mechanism can not be excluded.
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