DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 10-11/1974 str. 46     <-- 46 -->        PDF

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Summary


SELECITON AND CULTIVATION OF FOREST TREE SPECIES
ON THE BASIS OF THEIR SEXUALITY


On the basis of the author´s expositions the following conclusions may be
drawn:
1) The sexuality is the starting basis of selection, improvement and cultivation
of forest tree species, which are generatively propagated (through seeds).


2) The sexuality of individual forest tree species should be studied better
and more completely, and that from the biological, physiological and genetical
aspects.


3) The heritability of many characters of forest tree species cannot be successfully
followed up independently of their sexuality.


4) When cultivating dioecious tree species greater attention should be paid in
the future to the representativeness and percentage share of male and female
trees in all stand and forests, because their value and yield depend on it.


5) The characters of forest tree species are inherited both through autosomes
and through sex chromosomes, and this should also be taken into account when
regulating the sex structure in the stands.


6) In cultivation of monoecious tree species the sexuality is expressed in the
form of a higher or lower maleness or femaleness of trees.


7) The strength of sex expressivity in monoecious trees is especially significant
in the selection of seed crop stands, reconstruction of natural forests, and
in general wherever yield of seeds plays a decisive or important role.


8) The strength of sex expressivity in monoecious trees is also significant in
respect of the growth and increment of trees.


9) Sexuality is a starting basis also of selection, improvement and cultivation
of forest tree species, vegetatively propagated (from stumps, roots branches,
cuttings, setts, etc.).


10) Attempts ought to be made first to clonally propagate and spread good
genotypes of all the forest tree species (whether they be generatively or vegetatively
propagated), and in this connection to consider scientifically the problems
bound to the sexuality of the initial material.


In the selection and cultivation of forest tree species on the basis of their
sexuality there also arise numerous problems. In so far as they are at least
exactly considered, understood and formulated, the aim of the present explanations
has been achieved.