Os01g44260

OsDfr is a stress-induced gene that produces dihydroflavonol-4-reductase involved in the flavonoid pathway.

Annotated Information

Introduction

Two well-studied pathways associated with stress responses are the abscisic acid (ABA)-mediated abiotic stress response pathway and the ubiquitous flavonoid biosynthetic pathway.One common element between the ABA mediated pathway and the flavonoid pathway is the role of the MYB and MYC class of transcription activators on target gene expression. In Arabidopsis, the Atmyb2 and rd22BP1 genes regulate rd22 gene expression in the ABA-dependent abiotic stress response pathway. In maize, product of the C1-myb gene regulates expression of the flavonoid pathway genes in cooperation with a MYC family protein encoded by the R gene. The flavonoid biosynthetic pathway genes have been well- characterized and assigned with functions in two major cereal crop plants such as maize and rice. The rice flavonoid pathway is reported to respond to biotic and abiotic stress situations. Flavonoid accumulation in response to UV-B, cold, and drought were reported earilier.

Drought and salinity tolerance in rice are two of the most important agronomic traits, and unraveling the genetic and molecular basis of them is of paramount importance in genetic improvement of this crop for saline and water limited environments. Most importantly, with the availability of the complete genome sequence, saturated genetic maps and good EST coverage, rice serves as a great model crop plant to study stress response mechanisms at the genetic and molecular level. Further, the flavonoid biosynthetic pathway has been one of the most thoroughly investigated pathways in plants and the products have been used extensively as visible markers in genetics and breeding experiments. This pathway is amenable for investigation in rice because of several advantages: availability of cDNA clones for all major genes of the pathway, a wealth of literature on gene expression and regulation, an array of specific mutants, clearly visible phenotypes and well-established extraction and purification protocols. Molecular dissection of the regulatory elements and the mechanisms by which they regulate the expression, temporally and spatially, of a host of genes belonging to diverse but functionally connected pathways will help in elucidation of the genetic basis of abiotic stress response in rice.

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