Charaterization of Nucleic Acid of Tomato Yellow Leaf Curl
Abstract
Tomato yellow leaf curl virus (TYLCV) was successfully isolated from infected SVRDC-4 and Seeda tomato plants. Purification procedure consisted of the extraction of powderized infected tissues in tris- HCI buffer, clarification with chloroform of butanol, precipitation of the virus with polyethylene glycol, and virus purification though caecium sulfate centrifugation. The viral nucleic acid was isolated from purified virus preparation by phenol-chloroform extraction followed by ethanol precipitation. Positive reaction to diphenylamine test and sensitivity to DNAse of isolated nucleic acid suggested that it is DNA. Studies on hyperchromic shift of heat and formaldehyde treated preparations indicated that TYLCV-nucleic acid is single stranded DNA. Its molecular weight as estimated by 0.7 – 0.8 % agarose gel electrophoresis is 0.63 x 106 daltons.
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