Coordinated Regulation of the Genes Participating in Starch Biosynthesis by the Rice Floury-2 Locus

Overview

Journal Plant Physiol

Specialty Physiology

Date 1996 Jan 1

PMID 12226172

Citations 10

Authors

T Kawasaki

K Mizuno

H Shimada

H Satoh

N Kishimoto

S Okumura

N Ichikawa

T Baba

Affiliations

Soon will be listed here.

Abstract

The recessive floury-2 (flo-2) locus of rice (Oryza sativa L.), which is located on chromosome 4, causes a strong reduction in expression of the gene encoding an isoform of branching enzyme RBE1 in immature seeds 10 d after flowering. Mapping of the RBE1 gene demonstrated the localization on rice chromosome 6, suggesting that the wild-type Floury-2 (Flo-2) gene regulates RBE1 gene expression in trans. However, reduced expression of the genes encoding some other starch-synthesizing enzymes, including another isoform of branching enzyme RBE3 and granule-bound starch synthase, was also found in the flo-2 seeds. In spite of the low level of RBE1 gene expression in the immature seeds of the flo-2 mutants, the RBE1 gene was equally expressed in the leaves of the wild type and flo-2 mutants. Thus, these results imply that the Flo-2 gene may co-regulate expression of some of the genes participating in starch synthesis possibly in a developing seed-specific manner.

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