Variability and relationships among rooting characteristics for white poplar hardwood cuttings
2020
White poplar is a key species in wood production and afforestation, but also
very important for biodiversity preservation and habitat improvement.
Vegetative propagation from hardwood cuttings is the most desirable method
of white poplar breeding. The present research analyzed the effect of
various technological treatments on four white poplar clones. Selected
treatments were powder formulations of indole butyric acid (IBA) and foliar
treatment with urea. The variability of 14 morphometric characteristics on
the rooting of cuttings was analyzed, as well as relationships between them.
Differences in analyzed morphometric characteristics depended on genotype,
while the effect of the examined technological treatments was detected only
by Fisher’s least significant difference (LSD) test. Significant variability
between genotypes was found for traits describing rooting at the basal cut
(R0 and R0p), the number of leaves (LN), the total number of roots (TRN),
and cutting survival in the first part of the growing season (SURV07).
Application of IBA had significant stimulating effects on rooting at the
lower part of cuttings (R05) compared to controls. Variability between
genotypes after foliar treatment with urea was not detected. The examined
parameters were grouped into 5 groups by principal component analysis, where
shoot traits and traits that describe rooting at the basal cut were in the
same group with total number of roots, and cutting survival (SURV07) was in
a separate group. These results suggest a need for further testing of the
characteristics of hardwood cuttings in white poplars. More efficient clone
technology is needed, using auxins and/or nitrogen fertilization designed to
suit the specific requirements of particular clones. [Projects of the
Serbian Ministry of Education, Science and Technological Development, Grant
no. 43007: Studying climate change and its influence on the environment:
impacts, adaptation and mitigation and Grant. no 43002: Biosensing Technology
and Global Systems for Continuous Research and Integrated Management of
Ecosystems]
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