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Dot-blot hybridization for detection of five cucurbit viruses by digoxigenin-labelled cDNA probes

, : Dot-blot hybridization for detection of five cucurbit viruses by digoxigenin-labelled cDNA probes. Agricultural Sciences in China 6(12): 1450-1455

Dot-blot hybridization was applied in this paper to detect five viruses infecting cucurbitaceous crops, Zuccini yellow mosaic virus (ZYMV), Watermelon mosaic virus (WMV), Cucumber mosaic virus (CMV), Papaya ringspot virus-watermelon strain (PRSV-W) and Squash mosaic virus (SqMV), as a good alternative assay in seed health test and epidemiological and transgenic research. Digoxigenin-labelled cDNA probes of the five viruses were synthesized by PCR with the specific primers and applied in dot-blot hybridization to detect five viruses in crude extraction of the infected leaves. And three SqMV probes of different lengths (0.55, 1.6, and 2.7 kb, respectively) were designed to investigate the effect of hybridization. The results showed that the sensitivity for detecting the crude extraction of infected leaves by ZYMV, WMV, CMV, PRSV-W, and SqMV was down to 1:160, 1:160, 1:320, 1:160, and 1:320, respectively. Three SqMV probes of different length showed no differences on the sensitivity and specificity. The digoxigenin-labelled probes prepared by PCR could be used for accurate and rapid identification of 5 viruses infecting cucurbitaceous crops with good stabilities, sensitivities, specificity, and reproducibilities.


DOI: 10.1016/s1671-2927(08)60007-3

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