DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 1-2/1966 str. 137     <-- 137 -->        PDF

Data concerning heights of the interspecific hybrids (from 1964) and seedlings
of White Willow from the mentioned populations are presented in Table 2.*


Ser. Species Population No. of Heights
No. data cm »t« — value
1 Salix alba L. Bakovci 122 202,21 1:2 = 11,6047***
2 Salix alba L. Osman Polje 434 128,13 1:3 = 0,8514
3 Salix frag. L. x 9 186,22 3:2 = 3,2249**
Salix alba L.


In Table 2 is visible that the representatives of the population »Bakovcihave
greater heights than the representatives from the population »Osman
Polje«, and that they differ significantly at a level of 0,1%. Between the
hybrids and the population »Bakovci« there is no significant, difference,
while if compared with the population »Osman Polje« they are superior and
differ significantly at a level of 1%.


Between the population »Bakovci« and that of »Osman Polje« there exist
not only differences in the intensity of height and diameter growth but also
differences in the branch angle, colour of shoots and the time of flushing
and seed setting. The arithmetic mean of the branch angle is greater in oneyear-
old seedlings from the population »Bakovci« than of one-year-old
seedlings from the population »Osman Polje«. As to this characteristic a
significant difference at a level of 1% in the lower 1/3 of the seedling height
exists. The colour of shoots in seedlings from the population »Osman Polje«
does not show a greater variability and it is light-red in all representatives
of the population, while in the population »Bakovci« it ranges from yellow,
light-green, dark-green, light-red to chocolate brown. As regards the flushing
and seed setting it was found that the individual representatives from the
population »Bakovci« approach the interspecific hybrids Salix alba L. x Salix
fragilis L.


According to J. Wright (5) in the centre of occurence of two species of
the same genus between which a hybridisation is feasible there comes to s
migration of the genes from one species to another. Because on the locality
»Bakovci« there exists the possibility of the intergradation between the
species Salix alba L. and Salix fragilis L. It can be assumed that in this case
we are also concerned with introgression, i.e. that the representatives of these
populations contain also the genes of Salix fragilis L. The population »Osman
Polje« is small and relatively isolated and perhaps here we also have the
effects of inbreeding which brought this population to a greater
homozygosity.


On the basis of what precedes it would seem that the representatives of
the population of White Willow posses a greater vitality and a more beautiful
habit on those locations where within the population of White Willow is
interspersed also Crack Willow, i.e. that probably also in these cases we are
concerned with introgression. Further, we assume that the interspecific
hybrids between these two species are more vital and of a more beautiful
habit than the pure species.


Works in this direction are in progress.


* Measurements were taken in the second half of August 1965, i.e. in the middle
of the second growing period.