RESPONSE OF ADVENTITIOUS BUDS FORMATION AND CLONE SELECTION IN VITRO FOR POPUWS TOMENTOSA

Adventitious buds formation was tested in 21 media with shoot segments of 8 clones of Populus tomentosa.Considerable variation was found in the response of adventitious buds formation among clones.Regression analysis showed a highly significant correlation existed between clonal response of adventitious buds formation and clonal growth response (r=0.86**,a=0.01).This suggests clone selection in vitro for growth is possible.Clonal response of adventitious buds formation was also significantly correlated with the contents of some endogeous hormones and amino acids (r=0.70-0.76*,a=0.02).While negative correlation occured between clonal response of adventitious buds formation and clonal rooting ability of cuttings in fields.Composition of medium strongly affected the behavior of cultures.