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Plant and Cell Physiology, 2003, Vol. 44, No. 10 975-981
© 2003 Oxford University Press

Arabidopsis CAMTA Family Proteins Enhance V-PPase Expression in Pollen

Nobutaka Mitsuda1, Tomomi Isono and Masa H. Sato

Graduate School of Human and Environmental Studies, Kyoto University, Yoshidanihonmatsu, Sakyo-ku, Kyoto, 606-8501 Japan

The pollen-specific cis-acting region of the AVP1 gene is involved in the expression of the Arabidopsis V-PPase gene during pollen development. We isolate AtCAMTA5, which binds to the 38-bp pollen-specific cis-acting region, by one-hybrid screening using the cis-acting region as a probe. The green fluorescent protein-fused AtCAMTA5 is specifically localized to the nucleus in Arabidopsis suspension cultured cells. The promoter-ß-glucuronidase reporter experiment shows the expression not only of AtCAMTA5 but also of AtCAMTA1 in pollen. In particular, AtCAMTA1 is specifically expressed in pollen. Both the one-hybrid analysis in the reporter yeast and in vivo transient effector-reporter analysis in Arabidopsis suspension cultured cells revealed that AtCAMTA1 could regulate gene expression depending on the CGCG-box within the 38-bp pollen-specific cis-acting region. These results indicate that AtCAMTA1 as well as AtCAMTA5 possibly enhance AVP1 expression in pollen.

1 Corresponding author: E-mail, mhsato{at}bio.h.kyoto-u.ac.jp; Fax, +81-75-753-6857.


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