Characterization of Rhizoctonia solani isolates from potatoes in Turkey and screening potato cultivars for resistance to AG-3 isolates


Yanar Y., Yilmaz G. , Cesmeli I., Coskun S.

PHYTOPARASITICA, vol.33, no.4, pp.370-376, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 4
  • Publication Date: 2005
  • Doi Number: 10.1007/bf02981304
  • Title of Journal : PHYTOPARASITICA
  • Page Numbers: pp.370-376
  • Keywords: potato, Rhizoctonia solani, anastomosis, resistance, ANASTOMOSIS GROUPS, STEM CANKER, YIELD, PATHOGENICITY, DISEASE, ORGANS, PLANTS, FUNGI, MAINE, KUHN

Abstract

A total of 304 Rhizoctonia solani isolates and 60 binucleate Rhizoctonia-like fungi were recovered from stems and tubers of infected potato plants over a 2-yr period in northeast Turkey. R. solani isolates were identified to 11 anastomosis groups (AGs): AG-1 (0.66%), AG-2-1 (5.6%), AG-2-2 (0.99%), AG-3 (83.9%), AG-5 (4.6%), AG-6 (0.66%), AG-8 (1.32%), AG-9 (0.33%), AG-10 (1.32%), AG-12 (0.33%), and AG-13 (0.33%). In the greenhouse tests, most of the AG-3 isolates were significantly more virulent than isolates belonging to other AGs on potato cv. Batum. Isolates of other anastomosis groups differed in their virulence. Results indicated that AG-3 is an important pathogen on potatoes grown in the study area. Five of 22 commercial and local potato cultivars evaluated for their reaction to R. solani AG-3 isolates (TP-2) under greenhouse conditions were highly resistant; the remaining cultivars exhibited different levels of susceptibility to the pathogen isolate.