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- W2415705058 abstract "The cDNAs of snowdrop lectin mature protein and its precursor protein, GNA12 and GNA34, were inserted downstream of a 35S promoter with a double enhancer and a omega fragment of TMV-RNA cDNA in the binary vector pBin438, or the phloem-specific CoYMV promoter in the vector pBcop1, respectively, resulting in the construction of four plant expression vectors pBGna12, pBGna34, pBCGna12, and pBCGna34. Leaf stripes of Nicotiana tabacum var. K326 were transformed with A. tumefaciens LBA4404 harboring the above expression vectors, respectively. PCR and Southern blot analysis showed that foreign GNA genes were inserted into the genome of transformed tobacco plants. Western blot analysis indicated that GNA could be expressed efficiently up to 0.08-0.15% of total soluble proteins in transgenic tobacco plants with pBGna34 or pBCGna34, while in those with pBGna12 and pBCGna12 GNA were hardly detected by immunoassay. The results from insect bioassay with a peach aphid (Myzus persicae) demonstrated that the transgenic plants of pBGna34 and pBCGna34 were aphid-resistant as shown by a 45-60% reduction in insect population density, with some individual transgenic lines being reduced by over 90%. In addition, it was evident that the 35S promoter with a double enhancer and CoYMV promoter had similar abilities to direct the GNA gene to express in transgenic tobacco plants, but because the CoYMV promoter drives the foreign gene in a phloem-specific expression manner, the transgenic plants of pBCGna34 showed higher aphid resistance." @default.
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- W2415705058 date "1998-01-01" @default.
- W2415705058 modified "2023-09-23" @default.
- W2415705058 title "Inhibition effect of transgenic tobacco plants expressing snowdrop lectin on the population development of Myzus persicae." @default.
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