| characterization and activity enhancement of the phloem-specific pumpkin pp2 gene promoter. | the promoter of the pumpkin (cucurbita moschata) pp2 gene (designated np) was isolated from the restriction enzyme-digested genomic dna pool by genome walking and its activity and phloem specificity were examined in transgenic tobacco plants by using gus as a reporter. deletion analysis of the promoter revealed that the 473-bp fragment (-465 to + 8 relative to the transcription start site; designated as npii) exhibited similar activity as the full-length np promoter and retained its phloem speci ... | 2004 | 15672837 |