The Reaction Levels of Five Inter-specific NERICA Lowland Rice Cultivars to Rice Yellow Mottle Virus in Screen-house Tests at Badeggi, Nigeria

Onwughalu, J. T. and Abo, M. E. and Onasanya, A. (2013) The Reaction Levels of Five Inter-specific NERICA Lowland Rice Cultivars to Rice Yellow Mottle Virus in Screen-house Tests at Badeggi, Nigeria. International Journal of Applied Research and Technology, 2 (9). 86 -92. ISSN 2277-0585

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Abstract

In this study, five lowland NERICA lines, namely, NERICA-L 8, 38, 42, 47 and 49, were evaluated for resistance to rice yellow mottle virus (RYMV) as well as for the impact of the disease on reproductive and yield losses. Parameters such as plant height (cm) at maturity, percent productive tillers plant-1 , number of panicles plant-1 , number of grains panicle-1 , 1000-grain weight plant-1 , and percent spikelet fertility plant-1 were measured. And yield loss was calculated based on mean differences of number of grains/panicles of inoculated and un-inoculated entries. The impact of virus infection on number of panicle plant-1 at maturity was highest on NERICA-L 38, producing a significantly (p = 0.01) lower mean effect (19.33) on the attribute compared to other entries. No immunity was recorded for any of the test inter-specific (NERICA Lowland) varieties in the screen-house experiment. The screening investigation based on symptomatology indicated some levels of resistance to RYMV on NERICA-L 38, 42 and 47. NERICA-L 49 gave the highest mean number of grains per panicle; however, among infected plants NERICA-L 42 gave the best performance with respect to number of grains per panicle, yield loss (%) and SES rating. ELISA test also indicated virus content (%) as low as 2.1 % for NERICA-L 42.

Item Type: Article
Uncontrolled Keywords: New Rice for Africa (NERICA), Rice yellow mottle virus (RYMV), Resistance, Badeggi, Nigeria.
Subjects: Q Science > Q Science (General)
Q Science > QR Microbiology
S Agriculture > S Agriculture (General)
S Agriculture > SB Plant culture
Divisions: Faculty of Medicine, Health and Life Sciences > School of Biological Sciences
Depositing User: Mr Tayo Okunlola
Date Deposited: 12 Jul 2016 14:54
Last Modified: 12 Jul 2016 14:54
URI: http://eprints.abuad.edu.ng/id/eprint/1068

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