Abstract
IT is well established that only certain plant viruses are transmitted by the seed, but little is known about how a virus invades the embryo and is subsequently transmitted to progeny1,2. Since viral coat proteins are determinants of host3 and vector4 specificity, we reasoned that they could also determine transmissibility. Accordingly, coat proteins of two seed-transmitted viruses, barley stripe mosaic virus (BSMV) and cowpea mosaic virus (CPMV), and three non-seed-transmitted viruses, tobacco mosaic virus (TMV), bromegrass mosaic virus (BMV) and bean pod mottle virus (BPMV)1,2, were analysed.
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