First report of Phytophthora infestans A2 mating type in Turkey.

Necip TOSUN; Hüseyin Türküsay; Hikmet Saygılı

First report of Phytophthora infestans A2 mating type in Turkey.

Articles > Case Report · 2002

Authors: Necip TOSUN, Hüseyin Türküsay, Hikmet Saygılı

Journal of Turkish Phytopathology, Other Refereed National Journals, National, CABI, 2002, vol 31, pp 111-112

Summary

<span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif; color: rgb(38, 38, 38); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Phytophthora infestans<span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif; color: rgb(38, 38, 38); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"> isolates obtained from infected tomato plants in processing tomato fields in Marmara, Turkey, during the 2000 and 2001 growing seasons were tested for mating type, by growing them together with known mating types (A1 and A2) and searching for oospores (sexual spores). The agar plugs with mycelium of the suspected isolates were placed in the centre of each of two rye A and rye B plates. On one plate, agar plugs with mycelium of a known A1 strain (US940507) was placed on either side of the plate. On the other plate, the same thing was done using a known A2 strain (US940480). Of 160 P. infestans isolates tested, 59 (36.9%) were of the A2 mating type while 101 (63.1%) were of the A1 mating type. Thirty-four (21.2%) were metalaxyl-sensitive, 104 (65.0%) were moderately metalaxyl-resistant, and 22 (13.8%) were highly metalaxyl-resistant. The P. infestans A2 mating type is reported for the first time in Turkey.<o:p></o:p>

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