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<br /> <br /> <br /> <br /> <br /> <br /> <br /> 3. Stilbene synthase gene from grapevine. <br /> <br /> Each disease-resistance gene was transferred separately into callus (undifferentiated <br /> tissue) of variety Bun long in tissue-culture. Then, we manipulated plant hormones to <br /> produce shoots and then whole plants from the callus. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Taro calli (undifferentiated tissue) Taro plantlets in tissue-culture <br /> <br /> <br /> <br /> Do these disease resistance genes help Chinese taro resist pathogens? <br /> Yes, in preliminary tests using small, tissue-cultured plants. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Untransformed Chinese taro (NT) Chinese taro transformed with oxalate <br /> infected with Phytophthora colocasiae at oxidase gene (g5) shows complete arrest <br /> 12 days after inoculation. Note plant is of Phytophthora colocasiae without any <br /> almost dead. diseased lesions spreading to the leaves. <br /> <br /> 4 <br />