Your question is not clear.Please, give some details of what do you want exactly.Thanks

There is this Patent page on "Phloem-specific promoter"  [ http://www.google.com/patents/US5495007 ]. In there, the authors mentioned several phloem-related genes. You can check online using these genes as one of the key words, to see which promoters from these genes are/were frequently used for genetic transformation.       

Hi Ramesh,

For Arabidopsis there are two phloem-specific promoters that work very well:

SUCROSE TRANSPORTER 2 (SU2): expressed in the companion cells (from Arabidopsis)

GALACTINOL SYNTHASE (GAS1): expressed in the CC of the minor veins (from Cucumis melo).

In this publication you might find some interesting information about these promoters and further literature about them: http://www.sciencemag.org/content/316/5827/1030.short

Cheers,

Fernando

Dear sir,

Thank you very much for giving information related to PSP.

Regards

In which plant you want to know?