Authors:
Kabore Emmanuel
, Nitiema W. Leon
, Sereme Drissa
, Kuire P. P. Epiphane1
, Traore M. Djibril
, Sorho
Fatogoma and Simpore Jacques ,Burkina Faso |
Abstract:
Rice yellow mottle virus (RYMV; genus Sobemovirus) is the most important rice virus and is
widely distributed in Africa. Investigatingon transmission modes and their efficiency is urgently
needed to understand the factors contributing to the epidemiology of this viral disease. We
investigated RYMV transmission through dehydrated straw and roots, and assessed the viability
of virions over time under sun and shade-dehydrated conditions. Transmission via soil
contaminated with RYMV-infected rice straw and roots was also examined. Rice yellow mottle
virus was detected in sun-dried straw and roots until 70 days post harvesting and that
independently to RYMV isolate used. This result was confirmed by ELISA test. Elimination of
RYMV in rice plant residues during drying seems to result mainly from heat inactivation. Rice
seedlings grown in pots containing a mixture of autoclaved soil and sun-dried straw and root
contaminated with RYMV become infected when 8 mg of RYMV-infected straw per kg of
autoclaved soil and 50 ml of infected root sap per 100 g of sterile soil. Altogether, the results
demonstrated that RYMV is transmitted via rice plant residues such as straw and root, in which
the virus survives for several weeks |
