Turnip yellow mosaic virus. Coloured transmission electron micrograph (TEM) of virus particles (virions) of the turnip yellow mosaic virus (TYMV). This plant virus is a tymovirus, and has an RNA (ribonucleic acid) genome. It was first identified in 1949 in the Chinese cabbage plant (Brassica campestris pekinensis), a plant cultivated as a food crop. This virus also infects several other Brassica plants. Symptoms are blotching and yellowing. The virus is transmitted by several species of beetles. It is found in Eurasia and Australia. Magnification: x125,000 when printed 10cm high.
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