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PLANT PHYSIOLOGY , Vol 110, Issue 1 233-240, Copyright © 1996 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Arabidopsis Mutants with a Reduced Seed Dormancy

K. M. Leon-Kloosterziel, G. A. van de Bunt, JAD. Zeevaart and M. Koornneef
Department of Genetics, Wageningen Agricultural University, Dreijenlaan 2, 6703 HA, Wageningen, The Netherlands (K.M.L.-K., G.A.B., M.K.)

The development of seed dormancy is an aspect of seed maturation, the last stage of seed development. To isolate mutants of Arabidopsis thaliana that are affected in this process, we selected directly for the absence of dormancy among freshly harvested M2 seeds. The screen yielded two mutants exhibiting a reduced dormancy, rdo1 and rdo2, that are specifically affected in dormancy determined by the embryo. The rdo1 and rdo2 mutants show normal levels of abscisic acid and the same sensitivity to abscisic acid, ethylene, auxin, and cytokinin as the wild type. The rdo2 mutant but not the rdo1 mutant has a reduced sensitivity to the gibberellin biosynthesis inhibitor tetcyclacis. Double-mutant analysis suggested that the RDO1 and RDO2 genes are involved in separate pathways leading to the development of dormancy. We assume that the RDO2 gene controls a step in the induction of dormancy that is most likely induced by abscisic acid and is expressed as an increase of the gibberellin requirement for germination.


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