Genetičko-ekološke osnove adaptivnosti pajasena u Srbiji

Abstract

Analiza prirode interakcija 'genotip-sredina ' obezbedila je razlikovanje tri biološka nivoa adaptivnosti pajasena tj.: (1) ontogenetski, (2) populacioni i (3) filogenetski. U radu je ocenjivana promenjivost morfofizioloških osobina pajasena u Srbiji na nivou populacija, stabala i linija polusrodnika. Dobar fenotip je rezultat dugotrajne selekcije. Priroda reakcije na delovanje selekcije nije uvek predvidiva s obzirom da genotipovi poseduju razne fenotipske reakcije, posebno u odnosu na adaptibilnost. S obzirom da se proces adaptacija odvija na raznim nivoima biološke organizacije, za svaki od njih treba utvrditi specifične kriterijume adaptivnosti.

The analysis of the nature of interactions 'genotype-environment' made it possible to distinguish three biological levels of tree of heaven adaptation, i.e.: (1) ontogenetic, (2) population, and (3) phylogenetic. This paper assesses the variability of morphophysiological characteristics of tree of heaven in Serbia at the level of populations, trees and half-sib lines. A good phenotype results from long-term selection. The nature of reaction to the effect of selection is not always predictable, as genotypes are capable of various phenotypic reactions, especially regarding adaptability. As the process of adaptations is carried out at different levels of biological organization, specific criteria of adaptation should be determined for each of them.