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leaf tissues (100 g) were blended with 0.5 m m phosphate buffer (200 ml, pH 7.0) containing 0.1% mercaptoethanol, 0.01 m m EDTA, 0.1% TritonX-100 and 0.01 m m vitamin C. After a centrifugation at 10 000 g for 20 min, the supernatant was added with a 1⁄4 volume of chloroform⁄butanol (1 : 1, v⁄v) and stirred for 20 min, then again centrifuged at 24 000 g for 20 min. The virus was then precipitated from the supernatant by ultra-centrifugation for 2 h at 130 000 g).

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