Reference "A bZIP transcription factor, OsABI5, is involved in rice fertility and stress tolerance"

Reference ID

11669

Title

A bZIP transcription factor, OsABI5, is involved in rice fertility and stress tolerance

Source

Plant molecular biology, 2008, vol. , pp. -

Authors (5)

Zou-M	Guan-Y
Ren-H	Zhang-F
Chen-F

Abstract

The phytohormone abscisic acid (ABA) is involved in the adaptive stress response
and regulates expression of many stress-responsive genes, including some
transcriptional factors. A bZIP transcription factor, OsABI5, was isolated from
the panicle of Oryza sativa L. Expression of the OsABI5 gene was induced by
abscisic acid (ABA) and high salinity, and down-regulated by drought and cold (4
degrees C) in seedlings. The OsABI5 protein was localized in the nucleus and has
trans-activation activity. The N-terminal of the protein is necessary for its
activity. OsABI5 could bind to a G-box element and trans-activate reporter gene
expression. Complementation analysis revealed that the expression of OsABI5
driven by the 35S promoter could rescue ABA-insensitivity of abi5-1 during seed
germination and result in hypersensitivity to ABA. Over-expression of OsABI5 in
rice conferred high sensitivity to salt stress. Repression of OsABI5 promoted
stress tolerance and resulted in low fertility of rice. These results suggested
that OsABI5 could regulate the adaptive stress response and plant fertility of
rice as a transcription factor.