The Resistance of Farmers' rice Varieties to Rice Yellow Mottle Virus (RYMV) at Badeggi, Nigeria

Ukwungwu, MN.; Maji, AT.; Gana, AS.; Abo, ME.; Imolehin, ED.

The Resistance of Farmers' rice Varieties to Rice Yellow Mottle Virus (RYMV) at Badeggi, Nigeria

2005

Ukwungwu, MN. | Maji, AT. | Gana, AS. | Abo, ME. | Imolehin, ED.

Forty-eight farmers' rice varieties and 12 improved and released varieties were screened in the screenhouse at the National Cereals Research Institute (NCRI) Badeggi, Nigeria by mechanical sap inoculation for their resistance to Rice Yellow Mottle Virus (RYMV). The rice varieties were categorized into 4 groups: highly susceptible, moderately susceptible, moderately resistant and resistant, based on standard evaluation scale (SES) for rice. Back-inoculation tests to a highly susceptible variety, Bouake 189 and enzyme linked immunosorbent assay (ELISA) showed that none of the varieties was immune to RYMV. The highly susceptible varieties displayed conspicuous yellow, mottle and stunting symptoms of RYMV. Many varieties were highly susceptible to RYMV and elicited high virus titre. Most of these farmers' varieties are either highly susceptible or moderately susceptible to RYMV.

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