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Isolation and expression analysis of peanut chlorotic streak caulimovirus (PClSV) full-length transcript (FLt) promoter in transgenic plants.

A promoter fragment from peanut chlorotic streak caulimovirus (PClSV) full-length transcript (FLt) was identified and later modified to have duplicated enhancer domain. The FLt promoter with its single or double enhancer domains, fused with the GUS reporter gene to form chimeric gene constructs, showed a high level of expression of these genes in cells and transgenic plants. The FLt promoter with its double enhancer domain gives an average threefold greater expression of genes compared to the FLt promoter with its single enhancer domain in transgenic plants. In young seedlings the expression was in the order root > leaf > stem. The histochemical GUS assay in young seedlings showed more activity in root tips and leaf midribs, veins, and other vascular tissues. The expression from the PClSV FLt promoter was compared with that from the figwort mosaic virus promoter in transgenic plants. These constitutive promoters were comparable in respect to GUS expression level.