Abstract
Protoplasts were isolated from H89, an embryogenic sweet orange (Citrus sinensis (L.) Osbeck cv. Hamlin) suspension culture, and electroporated with p35S-GFP, a plasmid carrying the gene for the green fluorescent protein (GFP) from the bioluminescent jellyfish Aequorea victoria. p35S-GFP was constructed by replacing the GUS coding sequence of pBI221 with a functional GFP gene, thereby placing the GFP gene under the control of the CaMV 35S promoter. Protoplasts were viewed by incident-light fluorescence microscopy twentyfour h after electroporation. 20-60% of the protoplasts emitted an intense green light when illuminated with blue (450-490 nm) light.
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