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Adventitious rooting is essential for vegetative propagation of woody species. We studied the effects of auxin and light on the development of adventitious roots in cuttings obtained from seedlings of  Eucalyptus saligna  Smith and  E. globulus  Labill in an attempt to characterize the adventitious rooting process and identify factors controlling rhizogenesis. Root development was scored as rooting percentage, root density (roots per rooted cutting), mean rooting time and root length. In both species, rooting time was reduced in the presence of auxin. Cuttings from 2-month-old  E. saligna  seedlings were responsive to lower auxin concentrations than comparable cuttings from  E. globulus  seedlings. Cuttings from 3-month-old  E. saligna  seedlings rooted promptly and rooting was not significantly affected by light conditions. In contrast, rooting of cuttings from 3-month-old  E. globulus seedlings  exhibited recalcitrant behavior and no roots were formed if illuminated during the root formation phase. Effective root regeneration of  E. globulus  cuttings was obtained by a 4-day exposure to 10 mg l −1  IBA and culture in darkness during the root formation step. Loss of rooting capacity with seedling age was more pronounced in  E. globulus  than in  E. saligna . The possibility of switching adventitious rooting off and on by manipulating light regime and exogenous auxin supply in  E. globulus , and the constitutive nature of rooting in  E. saligna  may provide useful models for examining the rooting process at the biochemical and molecular levels in  Eucalyptus .

Distinct effects of auxin and light on adventitious root development in Eucalyptus saligna and Eucalyptus globulus