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for the comparison of pear average-taxon regeneration coeffi cients depending on the
notching terms in 2012 and 2013.
The curves of variation of indices of regenerative coeffi cients in 2012 do not have
great excesses with the exception of the fi rst decade of September, when the regenera-
tive potential of
P. communis
was maximum for the season and
P. salicifolia
had a
slightly higher than average seasonal indices. The variation of indices of regenerative
coeffi cients in 2013 was considerably higher, that is, due to the instability of weather
conditions in 2013 (Figure 15.6).
FIGURE 15.6
Indices of pear average-taxon regeneration coefficients depending on the
notching terms in 2012 and 2013.
15.4 CONCLUSION
The intensity of nonmorphogenetic post-trauma regeneration in
Pyrus
species stud-
ied was not the same and changed in the years of investigation: it depended more on
temperature fluctuation than on precipitation amount and hydrothermal coefficient.
The assumption can be made that periods of the highest regenerative activity can be
favorable for cutting, grafting, micro-cloning, etc., as well as for various technological
processes, associated with trauma/damage.
ACKNOWLEDGMENTS
This study is partly based on the work supported by the National dendrological park
“Sofiyivka” of NAS of Ukraine (No 0106U009045) together with Uman National
University of Horticulture (No 0101U004495) in compliance with their thematic
plans of the research work. We thank corresponding member of NAS of Ukraine Ivan
Kosenko, PhDs. Michael Nebykov and Aleksandr Serzhuk as well as graduate student
Vitaliy Adamenko for their help with scientific-technical programs and for consulta-
tions and discussion.
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