Abstract
Saishin (Brassica chinensis L.) mesophyll protoplasts and E. coli spheroplasts harbouring hybrid plasmid with tandemly dimerized cauliflower mosaic virus DNA were mixed in ratios of 1:1,000 and incubated for 20 min at 30° C in the presence of 20% polyvinyl alcohol. Subsequently, protoplasts/spheroplasts mixture was washed with high pH-high Ca buffer. After 3 days of culture, 8% of Saishin protoplasts were transfected as monitored by immunofluorescence technique. When plant protoplasts and bacterial spheroplasts were mixed in ratios of 1:100 or 1:2,000, 1% or 5% of protoplasts were transfected, respectively.
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