Reference "The OsLti6 genes encoding low-molecular-weight membrane proteins are differentially expressed in rice cultivars with contrasting sensitivity to low temperature"

Reference ID

11452

Title

The OsLti6 genes encoding low-molecular-weight membrane proteins are differentially expressed in rice cultivars with contrasting sensitivity to low temperature

Source

Gene, 2005, vol. 344, pp. 171-180

Authors (4)

Morsy-M-R	Almutairi-A-M
Gibbons-J	Yun-S-J

Abstract

Rice (Oryza sativa L.) is sensitive to chilling particularly at early stages of
seedling establishment. Two closely related genes (OsLti6a, OsLti6b), which are
induced by low temperature during seedling emergence were isolated from a cold
tolerant temperate japonica rice cultivar. These genes are closely related to
the Arabidopsis rare cold-inducible (RCI2) and barley low-temperature-inducible
(BLT101) genes. Based on direct biochemical and indirect physiological evidence
and similarity with a conserved protein domain in the Cluster of Orthologous
Groups (COG) database (e.g., yeast PMP3), the rice genes belong to a class of
low-molecular-weight hydrophobic proteins involved in maintaining the integrity
of the plasma membrane during cold, dehydration and salt stress conditions. Both
genes exhibit a genotype-specific expression signature characterized by early
and late stress-inducible expression in tolerant and intolerant genotypes,
respectively. The differences in temporal expression profiles are consistent
with cultivar differences in cold-induced membrane leakiness and seedling vigor.
The presence of CRT/DRE promoter cis-elements is consistent with the
synchronized expression of OsLti6 genes with the C-repeat binding factor/drought
responsive element-binding protein (CBF/DREB) transcriptional activator. The
present results indicate that the Oslti6 genes are part of a battery of cold
stress defense-related genes regulated by a common switch.