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PLANT PHYSIOLOGY , Vol 110, Issue 1 89-96, Copyright © 1996 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Coordinated Regulation of the Genes Participating in Starch Biosynthesis by the Rice Floury-2 Locus
T. Kawasaki, K. Mizuno, H. Shimada, H. Satoh, N. Kishimoto, S. Okumura, N. Ichikawa and T. Baba
Mitsui Plant Biotechnology Research Institute (T.K., H. Shimada, S.O., N.I.), TCI D-21, Sengen 2-1-6, Institute of Applied Biochemistry (K.M., T.B.), University of Tsukuba Tennohdai 1-1-1, Tsukuba 305
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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