Effects of age and growth stimulators on rooting of Hopea odorata Roxb. cuttings
Keywords:
Cuttings,, age,, growth stimulators, Hopea odorata RoxbAbstract
Hopea odorata Roxb. is an evergreen species for large timber with high
economic and ecological values, dominated in the tropical rain forests that
predominates in tropical rainforests. This is one of the indigenous tree
species planted popularly in Vietnam. The objective of the study was to
determine the effects of growth regulators and ages of the mother plants on
the rooting ability of cuttings. The cuttings were collected from plantations
in Ho Chi Minh City and Dong Nai province. Growth regulators included
IBA (1,000, 1,500ppm) and 2.4D (50, 100, 500ppm); the ages of the
mother tree for cuttings (1, 2, 5, 10, 15 years old) were tested in two
separate experiments. The results showed that plant growth stimulantors
affected root quality in Hopea odorata cuttings. In this study, cuttings
treated with 2.4D at a concentration of 100ppm had generally better rooting
percentage, number of roots per cutting and root length. Besides, the
rooting ability of Hopea odorata cuttings increased when the age of mother
plant reduced. Cuttings collected from one-year-old mother trees had very
high rooting percentage (94.7%) and those decreased only 20.5% when
cuttings were collected from 15 - year-old mother trees, number of roots
per cutting and root length also had the same trend.
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