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We have isolated a severe dwarf transposon ( Ds ) insertion mutant in rice ( Oryza sativa L.), which could be differentiated early in the seedling stage by reduced shoot growth and dark green leaves, and later by severe dwarfism and failure to initiate flowering. These mutants, however, showed normal seed germination and root growth. One of the sequences flanking Ds , rescued from the mutant, was of a chromosome 4-located putative ent -kaurene synthase ( KS ) gene, encoding the enzyme catalyzing the second step of the gibberellin (GA) biosynthesis pathway. Dwarf mutants were always homozygous for this Ds insertion and no normal plants homozygous for this mutation were recovered in the segregating progeny, indicating that the Ds insertion mutation is recessive. As mutations in three recently reported rice GA-responsive dwarf mutant alleles and the dwarf mutation identified in this study mapped to the same locus, we designate the corresponding gene OsKS1 . The osks1 mutant seedlings were responsive to exogenous gibberellin (GA 3 ). OsKS1 transcripts of about 2.3 kb were detected in leaves and stem of wild-type plants, but not in germinating seeds or roots, suggesting that OsKS1 is not involved in germination or root growth. There are at least five OsKS1 -like genes in the rice genome, four of which are also represented in rice expressed sequence tag (EST) databases. All OsKS1 -like genes are transcribed with different expression patterns. ESTs corresponding to all six OsKS genes are represented in other cereal databases including barley, wheat and maize, suggesting that they are biologically active.
Plant Cell Reports – Springer Journals
Published: Mar 1, 2005
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