Cloning of the promoter region of plasma membrane aquaporin<Emphasis Type="Italic">BnPIP1</Emphasis> from<Emphasis Type="Italic">Brassica napus</Emphasis> and its functional analysis |
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Authors: | Qiuju?Yu Li?Du Yuanlei?Hu Email author" target="_blank">Zhongping?LinEmail author |
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Institution: | College of Life Science, Peking University, Beijing 100871, China |
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Abstract: | A 1.6 kb upstream regulatory sequence (GenBank accession no. AF472487) of plasma membrane aquaporinBnPIP1 gene fromBrassica napus was obtained by genomic walking based on ligation-mediated PCR method. Sequence analysis indicated that this fragment contained
seed germination specific and vascular specific sequences. The 1.6 kb upstream sequence and various 5′ end deleted sequences
were fused withuidA gene and constructed into plant expression vectors which were used for tobacco transformation. GUS histochemical assay showed
that the 1.6 kb fragment had high levels of promoter activity and the GUS staining was mainly distributed in vascular systems
and tissues with rapid expanding and proliferating cells. Promoter deletion analysis showed that the deletion of -1610 — -1030
bp resulted in a dramatic reduction in GUS activity. It was assumed that there might be cis-acting element(s) existing in
this region. Whereas, the region located at -1030 — -902 bp strongly inhibited the expression ofgus and probably contained negative regulatory element(s). The fragment of -902 — -19 bp could also directgus expression at high level. |
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Keywords: | Brassica napus aquaporin promoter functional analysis |
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