Pollen-specific regulation of vacuolar H+-PPase expression by multiple cis-acting elements.
We dissected the regulatory region of the AVP1 gene encoding the vacuolar H+-pyrophosphatase (V-PPase) of Arabidopsis thaliana by using a GUS-reporter assay system. The cloned 1.4 kb 5'-regulatory region in the GUS-reporter transgenic plants was sufficient for the light-induced repression. Furthermore, the 1.4 kb regulatory region was active in all tissues examined and its activity was especially enhanced in pollen, whereas the shorter 0.4 kb regulatory region was active only in pollen. Further detailed analyses revealed that the GUS activity in pollen was regulated by at least three cis-acting regions in an additive or synergetic manner. These findings establish a distinct mechanism of the tissue-specific regulation of V-PPase expression in developing pollen. and imply the biological significance of the V-PPase in pollen maturation.
Mitsuda
N
N
Graduate School of Human and Environmental Studies, Faculty of Integrated Human Studies, Kyoto University, Japan.
Takeyasu
K
K
Sato
M H
MH
D017360:Arabidopsis / Q000201:enzymology*; D001483:Base Sequence; D017931:DNA Primers; D015971:Gene Expression Regulation, Enzymologic / Q000235:genetics / Q000502:physiology*; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology*; D043564:Inorganic Pyrophosphatase; D008969:Molecular Sequence Data; D030821:Plants, Genetically Modified / Q000201:enzymology; D011058:Pollen / Q000502:physiology*; D011755:Pyrophosphatases / Q000235:genetics*; D012045:Regulatory Sequences, Nucleic Acid; D014617:Vacuoles / Q000201:enzymology*
D017931:DNA Primers; D011755:Pyrophosphatases; D043564:Inorganic Pyrophosphatase