Infection of groengram plants by mungbean yellow mosaic virus (MYMV) caused significant reduction in number of pads per plant, seed yield and 100-seed weight. When healthy and infected leaves were compared a reduction in the contents of chlo- rophyll and functional chloroplast cells was evident in infected leaves. Soluble N and reducing sugars accumulated to a greater extent in infected then in healthy leaves. Photosynthetic rate was reduced in infected leaves in comparison with healthy ones.
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