Journal
PLANT AND CELL PHYSIOLOGY
Volume 47, Issue 11, Pages 1473-1483Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcl012
Keywords
hAT superfamily; floral organ number 1/multiple pistil 2; Oryza; rice; transposon
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Recent completion of the sequencing of the rice genome has revealed that it contains > 40% repetitive sequences, most of which are related to inactive transposable elements. During the molecular analysis of the floral organ number1/multiple pistil 2 (fon1/mp2) mutant, we identified an active transposable element dTok0 that was inserted at the kinase domain of FON1, a homolog of CLAVATA1. Insertion of the element into FON1 generated an 8 bp duplication of its target sites, which is one of the major characteristics of the hAT family of transposons. The dTok0 element was actively transposed out of the FON1 gene, leaving 5-8 bp footprints. Reinsertion into a new location was observed at a low frequency. Analysis of the genome sequence showed that the rice cultivar 'Nipponbare' contains 25 copies of dTok elements; similar numbers were present in all the Oryza species examined. Because dTok0 does not encode a transposase, enzyme activity should be provided in trans. We identified a putative autonomous transposon, Tok1 that contains an intact open reading frame of the Ac-like transposase.
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