The Rooting Performance of Different Clones of Acacia melanoxylon
Ten fine clones of Acacia melanoxylon were rooting cultured by using single uniformly growing sprouts that were cut from subculture to investigate their rooting performance. In the same rooting medium ( 1/2MS+IAA1. 0 mg/L+IBA0. 5 mg/L ) , three out of ten clones had the rooting rate above 90%, average root number a-bove 3. 7 per seedling, and root length above 3. 1 cm; four had the rooting rate of 50% ~80% while that of the other three were below 50%. Clones with the rooting rate smaller than 50% had the average root number below 2. 1 per seedling and root length below 1. 0 cm. The relation between average seedling height and rooting rate, root number and root length were different because of different clones, but in general, the correlation between the average seedling height and the rooting rate were extreme significant , and significant between the average seedling height and the number&length of root. This research provided a theoretical basis for the scale production of differ-ent clones, and was helpful to improve productivity.
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