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The caryologic technics aim to determine the level of polyploidy of a population or a species. The information brought for the knowledge of the chromosomal number of a species, is of various nature. Thus for several years the caryology has made it possible to better understand the taxonomy of a species, its tendencies evolutionary, its geographical distribution and the phenomena of its speciation [16]. Any time the chromosomal number, although being able to characterize a plant or a group of plants is not a character constant.It can vary inside a group, tribe, family or kind, and within same species[12,15,16]. The technics of identification of the most known chromosomes are: traditional technics based on the histological cut, the Technics of Feulgen which has like action to colour in purple red the DNA chromosomal [6,7,8] and technics of bands or mechanisms that it brings into play are related to the physicochemical properties of the chromatin and the condensed form of the chromosomes. To highlight the chromosomes of a species we observed somatic mitosis carried out bolsters of young roots. The principal stages of the technics has to follow are: the pretreatment, fixing, storage, the hydrolysis, colouring, the assembly and observation. All this work was completed on young roots of Solanum sodomeum L. or the number of the chromosome is still questioned.

Olea europea L. is a typical tree of the Mediterranean area where are concentrated 98% of the plantations and 90% of the world olive-growing production [6]. In Algeria, Olea europea L, arboricole species most significant following the surface occupies [14], which is 2,3% of the total surface of Algeria. Algerian oleiculture is divided into 3 zones: West, center and East. For his multiplication we used at olive- tree, two types of methods: in first the traditional methods (woody layering, division of the stocks, grafting) thus the vegetative way which is practised there or olivetree cultivates in an extensive way being intended for auto consumption and in second by modern methods carried out in seedbeds (layer herbaceous, sowing, grafting, culture in vitro) which is delicate but of prospect [6,8,9]. The modern methods of obtention of the improved plants and a good quality envisages utilisation of the cores to the reproduction. Out the cores of olive tree are reached by the phenomenon of dormancy, phenomenon which prevents obtention of the good results to the multiplication, reason for which the study of different the concentration from Gibberelic acid (GA3) on germination from the seeds of olive-tree, Chemlal variety, answered in Algeria was started. The results obtained are encouraging and deserve to be used in practice.