Study on the Relation Between RBDV Infecting Stages in Maize Vein Cell and Active Transmission of Laodelphax striatellus Fallen

Rice black streaked dwarf virus (RBSDV) infecting stages were viewed in maize vein cell during its different infection period by electron microscope. It was found that the RBSDV particles infected in the maize cell appeared at first in the cytoplasm near the cell wall, some single virus particles seem to be connected with plasmodesma. The viroplasm was produced in cytoplasm, and the RBSDV particles multiplied and scattered initially along the periphery and subsequently spread out towards the viroplasm. When the viroplasm was full of virus particles, some tubules with about 90nm in diameter appeared in the cytoplasm. Subsequenctly the virus particles arrayed in row among them, and finally the particles aggregated into crystalline array and the cytoplasm tubules disappeared. The percentage of active transmission of small brown plant hopper (Laodelphax striatellus Fallen) varied with the infection stage of RBSDV in maize cell while the nymph acquiring feeding. There were 2.93% and 7.83% of viruliferous rate respectively when their nymph acquiring feeding in the vein cell of maize among RBSDV particles were going to multiply in the periphery and inner of viroplasma, but no one when the noninfective nymph of them acquiring feeding in maize cell among the virus particles was going to the stage of appearing cytoplasm tubules and forming crystalline array.