Phenogenetic variability of the linear increment in Scotch pine: Study
of genotype peculiarities as a programme of individual development
Isakov Yu.
NFSUE Research
Study of phenotypical
variability of vegetative characters in woody plants showed insuffiency
of use of genetic and statistical parameters, following from the model of
polygenic determination of quantitative characters (K. Mather
& J. Jinks, 1985). Restriction of the model is caused by reflection of only
one side of quantitative character manipulation – variability in space and it
does not take account of another one – change in time (in dynamics). The latter
within this models carried out deductively by extrapolation data of static
series into time ones. If we suppose, that the basis for the development of the
model were ideas about structural gene work, then the hereditary factors,
conforming to expression and regulation of the gene work did not find
reflection in it.
The aim of the investigations is
development of approaches for genotype study as a programme
of evolution that's why the subject of the study was phenogenetic
variability of linear increment – the part of its phenotypical
variability, connected with the process of individual tree development. Pine
linear increment has a strictly fixed by years metamer
age variability. That is very convenient for carrying out of investigations.
The work was carried out on the
constant forest seed plots and progeny trials of Scotch pine, established with
the progeny of randomly selected trees.
There was studied variability of
ontogenesis periods with the help of the complex of statistic methods. In the
result there was detected ambiguity of the changes in ontogenesis of genetic
and statistic parameters. It points to genetic step-type behaviour
of the development of linear increment. There was revealed the age period
(10-22 years) within which tree genetic potentials are displayed. This period
of ontogenesis of young pine trees is taken for the basis in the subsequent
investigations.
For the study of the display of
morphological peculiarities in linear increment development it is necessary to
exclude genotypic and environmental variability effect. It was achieved by the
analysis of metamer of variability of the character
within an individual tree and in the same for all tree
sampling ontogenesis period.
During the analysis of phenogenetic increment variability there was used the model
of time (dynamic) series and its decompositions into deterministic and residual
components. The differences of the trajectory of linear increment development
in ontogenesis where studied by by multiple
correlation analyses ("S"-technics).
Convolution of information was carried out by original method allowing to reveal epigenetic component of phenotypic variability – similarily degree of their growth dynamics. Perspectivility of such approach is confirmed by
experimental data.
1. Interaction analysis genotype-environment in
seed progeny allowed to determine a group character of
mother trees distribution by the similarity degree of their growth and its
heredity in progeny. Different populations are characterized by different
frequency of isolated groups. 2. There were pointed out families with narrow,
middle and wide range and spectrum of variability by this index, There was
determined a positive, reliable correlation between the middle degree of growth
similarity in a family and its middle height. 3. There was revealed adaptive
character of the index, displaying in the change of growth dynamics in the
extreme conditions.