Abstract
The formation of adventitious or lateral roots is induced by cutting hypocotyl or root. This phenomenon is called as "root apical dominance" It is suggested that the trans-zeatin riboside, transported from root via xylem, controls negatively the formation of roots. In this study, we isolated and characterized mutants with week root apical dominance. The ar-C12 mutation causes remarkable stimulation of adventitious root formation. The ar-C22 mutation causes the arrest of the growth of only primary roots, no formation of lateral roots, and the stimulation of adventitious root formation. Genetic and mapping analyses of these mutants imply that ar-C12 is allelic to the sur2 mutant and ar-C22 is allelic to the cre1/wol mutant. The rot302 mutation causes the inhibition of root growth, highly branching of roots, and the stimulation of adventitious root formation. Genetic and mapping analysis of rot302 mutation is under going.
