Light-dependent polyploidy control by a CUE protein variant in Arabidopsis

Light-dependent polyploidy control by a CUE protein variant in Arabidopsis Endoreduplication is a special cell cycle that increases ploidy without cell and nuclear division. In plants endoreduplication is essential for development. We isolated a dominant Arabidopsis mutant from activation tagging lines that had increased polyploidy in darkness. This mutant, ipd1-1D (increased polyploidy level in darkness 1-1D), shows longer hypocotyls and increased ploidy levels only in dark-grown seedlings. The corresponding gene encodes a protein that contains a CUE domain variant. IPD1 is specifically expressed in mitotically dividing cells. Furthermore we show that blue and far-red light can suppress the ploidy increase in ipd1-1D and also suppress the reporter expression in IPD1-promoter β-glucuronidase transgenic plants. These results suggest that IPD1 regulates the endocycle leading to hypocotyl elongation and this function is controlled by blue and far-red light. Plant Molecular Biology Springer Journals

Light-dependent polyploidy control by a CUE protein variant in Arabidopsis

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Kluwer Academic Publishers
Copyright © 2006 by Springer Science+Business Media B.V.
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
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