Virulence diversity of rice blast Pyricularia oryzae Cavara

Abstract

Abstract The purpose of this study was to found the distribution of Pyricularia oryzae races in three different regencies in South Sulawesi and to analyze gene linked to the virulence of P. oryzae in causing blast disease on rice. Determination of P. oryzae races was conducted using 1 set of rice differential varieties consisting of Asahan, Cisokan, IR 64, Krueng Aceh, Cisadane, Cisanggarung, and Kencana Bali. The intensity of blast disease was observed seven days after inoculation using the Standard Evaluation System for Rice (IRRI) evaluation standard using a 5-9 scale of the necrotic area to determine the host resistance level. Based on morphological observation, 20 isolates were referred to as P. oryzae. Inoculation of P. oryzae isolates on 7 differential varieties of rice showed, that 12 races (000, 001,003,010, 020,023, 100, 102,110,111,173, dan 251) existed between P. oryzae isolates tested. However, the 020 races were dominant in all districts were samples were collected.

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