Relative resistance to Rice yellow mottle virus in rice

Abstract

Salaudeen M.T. (2014): Relative resistance to Rice yellow mottle virus in rice. Plant Protect. Sci., 50: 1-7.We identified sources of Rice yellow mottle virus (RYMV) resistance in rice cultivars. Eight cultivars together with susceptible and resistant controls were evaluated under screenhouse conditions as inoculated and uninoculated treatment in completely randomised design with three replications. Seedlings were inoculated with the virus by sap transmission at two weeks after sowing. Disease incidence and severity (scale 1-9: 1-3 = green leaves with sparse dots or streaks, 9 = yellow or orange leaves and some plant dead), yield, and agronomic traits were recorded. Data analyses included Area Under the Disease Progress Curve (AUDPC), independent t-test, and Analysis of Variance. According to differences in most measured traits control cultivars FARO 29 and Gigante were proved to be the most susceptible and partially tolerant ones, respectively. Cvs FARO 12, FARO 17, FARO 37, and FARO 52 were classified as partially tolerant. Uninoculated control plants performed better than the inoculated for all the yield and agronomic parameters. Reduction in plant height (6%) and number of tillers per plant (4.8%), increased days to heading (3 days), and reduction in paddy yield (6.5%) was lowest in cv. Gigante. Paddy yield per plant of the RYMV-inoculated was the highest in cv. Gigante (2.4 g). The rice cultivars which combined RYMV-resistance with high-yield could be utilised in rice breeding programmes in order to enhance food security.

Incidence and Distribution of Rice Yellow Mottle Virus Disease in Kebbi State, Nigeria

“…Within the four locations visited, RYMVD leaf symptoms severity was mild (2.0) in three of the varieties namely: UT-Rice, Yarkundu and Jemila. Variety Wita (3.3) and Faro 44 (3.9) are close to very severe symptoms, this was like the findings of [21], who found that Faro 44 is vulnerable to virus. The rest of the varieties are severe with an overall mean severity of (2.8) ( Table 4).…”

Pathogenic Variation and Occurrence of Multiple Resistance-Breaking <i>Rice yellow mottle virus</i> Strains in Tanzania

“…, where: S i = disease severity at the ith observation and t i = time (days) at the ith observation [37].…”

Assessment of Korean rice lines for their reaction to rice yellow mottle virus in Ghana

“…Several management strategies have been recommended to control the disease but the use of resistant cultivars is the most cost-effective, environment-friendly, and sustainable ( Salaudeen 2014 ). Cultural practices and prophylactic methods are more effective if combined with the use of resistant varieties ( Kouassi et al., 2005 ).…”

“…Most rice accessions are susceptible to RYMV ( Sereme et al., 2016 ), including O. glaberrima species in which most sources of resistance to RYMV have been found earlier ( Traore et al., 2015 ). Partially and highly resistant varieties have been identified, but currently the disease is not controlled adequately, and its incidence continues to increase in Africa ( Kouassi et al., 2005 ; Salaudeen 2014 ). In Nigeria, an increase in the incidence of the disease was observed in addition to increase in severity from 30 to 90 % after one year period ( Odedara et al., 2016 ).…”