Mycobiology.  2001 Sep;29(3):164-169.

Differential Growth Response of A1 and A2 Mating Types of Phytophthora infestans on Rye A and V-8 Juice Agar Media Supplemented with Rhizome Powder of Cyperus rotundus

• Singh UP
• Sarma BK
• Nishimura
• Kobayashi
• Ogoshi A
• Zinkernagel V
• Schlenzig
• Schober-Butin B
• Aust HJ

Abstract

A new medium for studies of diversity among populations of A1 and A2 mating types of Phytophthora infestans has been evolved. The rye A agar and V-8 juice agar media on which P. infestans grows well have been amended with rhizome powder of Cyperus rotundus. A total of 259 isolates of A1 and A2 mating types representing Japan, Korea, India, Taiwan, Indonesia, Thailand, China, Nepal, U.K. and Mexico were screened for their growth response on these two media. Most of the A1 isolates did not grow well on them except Thailand while growth of A2 mating types differed as some grew on it whereas others did not. It is quite likely that the populations of A2 mating types that did not grow well on rhizome-amended medium are of different clonal lineage. This suggests that this medium can be used for the study of diversification among the isolates of the same or both the mating types as well as to detect the newly introduced genetically different isolates of P. infestans in a locality where it was not reported earlier.

Keyword

Cyperus rotundus; Mating types; Phytophthora infestans; Rhizome agar medium

MeSH Terms

Agar*
China
Cyperus*
India
Indonesia
Japan
Korea
Mexico
Nepal
Phytophthora infestans*
Phytophthora*
Rhizome*
Secale*
Taiwan
Thailand
Agar