The effect of priming seed for 8 h with water before sowing on the incidence and severity of infection of mungbean (Vigna radiata (L.) Wilczek) with mungbean yellow mosaic virus (MYMV) was investigated in a replicated, large-plot trial in 2002. Primed seeds germinated and emerged faster and more completely, resulting in the establishment of 45% more plants per unit area than non-primed seeds. However, subsequent mortality during the growth cycle in both treatments reduced this to a small, non-significant difference between treatments at final harvest. Symptoms of MYMV infection were assessed using a visual scoring index (VSI). More than 70% of the non-primed plants were judged to have severe or lethal symptoms whereas only 14% of the primed plants were similarly affected. Only 9% of non-primed plants showed no disease symptoms in contrast to 32% of primed plants. These marked differences between priming treatments in the incidence and severity of disease were reflected in the components of yield. Primed crops produced 80% more above-ground biomass (3.3 versus 1.9 t ha−1), 264% more pod yield (1.0 versus 0.28 t ha−1) and 415% more grain (0.36 versus 0.07 t ha−1) than did non-primed crops. Several possible hypotheses to explain these differences in response to MYMV are discussed.
Abdul Rashid; Harris, D.; Hollington, P.A.; Shamsher Ali. On-farm seed priming reduces yield losses of mungbean (Vigna radiata) associated with mungbean yellow mosaic virus in the North West Frontier Province of Pakistan. Crop Protection (2004) 23 (11) 1119-1124. [DOI: 10.1016/j.cropro.2004.04.002]