Effect of auxins on root formation in the vegetative propagation of Populus alba, Populus tremula, Picea abies and Juniperus communis
Effect of auxins on root formation in the vegetative propagation of Populus alba, Populus tremula, Picea abies and Juniperus communis
Adil Al-Kinany
ABSTRACT
During the course of training in GDR, vegetative propagation of Populus alba, Populus tremula, Picea
abies and Jniperus communis by cuttings using different
concentrations of IBA and NAA singly as well as in
mixture was studied from February, 1979 to June, 1979
under glass house conditions at the Department of
Biology, Dresden Technical University, Dresden. The
choice of the species for this work was predominantly
guided by their close similarity in silvicultural
behavior with economically important species of Iraq.
The IBA and NAA treatments of the four experiments were
laid in randomized complete block design, each
treatments being replicated three times with 18-20
cuttings per replication. The results of the study
showed that IBA up to 4000 ppm in mixture with NAA,
highly significantly increased the survival percentage
of the rooted cuttings of Populus alba, while IBA up to
200 ppm had a significant effect in terms of increasing
the number of branches and leaves, and fresh and dry
weight of stems as well as roots. The experimental
results of Populus tremula cuttings indicated that there
are bright prospects of boosting their rooting and
survival percentage by using higher concentrations than
2000 ppm of alone or in mixture with NAA. With Picea
abies, though IBA at 4000 ppm gave better survival
percentage and number of roots per plant than 200 ppm or
control, the differences among these treatments were
non-significant. However, there are indications of
obtaining promising results if higher concentrations
than 4000 ppm are tried. The work with Juniperus communis cuttings showed encouraging results in survival
percentage with IBA at 400 ppm and pointed to the need
for trying higher concentration then this in order to
enhance the survival percentage of rooted cutting stiff further.
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June 1980
Vol. 30, Iss. 2
