General aspects on the process of Germination The germination is defined as the emergency and the development of the essential structures of the embryo, revealing its capacity to give normal origin to one plntula, under favorable ambient conditions, giving sequence to the perpetuation of the species in the way (Son et al., 1987). Still, according to author, when the referring works to the analysis of seeds had been initiated, in the end of century XIX, only the emission of radcula already were enough so that the seed was considered as germinated.
However, with the evolution of the research, one verified that this criterion was not adequate, therefore many seeds emitted radcula, but the subsequent development was abnormal, with the production of plntulas weak, without conditions to establish itself in the field. The discrepancies between results of laboratory and small field were only for vigorous seeds. From the studies carried through for the Federal Laboratory of Seeds of U.S.A., in 1915, others had been carried through in the direction to standardize methods to evaluate the regular, fast and complete germination of the seeds of different species; correct interpretation of plntulas; the determination of adjusted substrata more; the treatments destined to the dormncia in addition etc. (Son et al., 1986). In accordance with Esau (1976), the seed is composed in two layers: tegumento (external layer that protects the seed and that, in general, calls rind of the seed, consisting of the forehead – external – and tgmen – internal) and the almond (main part of the seed formed for albmen and the embryo).
This picture revelaa necessity of agreement of the dynamics of urban spaces as conseqnciados effect of the process of production of the peripheral capitalism where the cidadesso produced to optimize the life of a bigger number of people, guaranteed areproduo of the capital in peripheral spaces. For another one ladoessa urbanization provoked a growth concentrated in some of the grandescidades, being considered a metropolizao phenomenon to assign padrode urbanization of some cities characterized for the growth descontroladoe desregrado of the resultant urban population of the globalization of the demercado economy. However it was responsible for social problems as the high tax deviolncia, lack of security and the raised indices of pollution, beyond dficitsde urban job, housing, school, health, and services. This dinmicareflete the process of socioespacial segregation where sectors of the city soocupados by the greater population purchasing power while moradiaspopulares is confined in valued areas less of the city. In all esseprocesso one perceives that a spalling of territories is existing nacidade in result of the individualistic and pragmatic logic of the society contemporary. Also it deserves consideration to examine the paper of the streets in the cities in the espaourbano. The habitations in the espaourbano do not hold the volume of population, provoking with this significant a habitacional deficit in the Brasil.Existem millions of families who do not possess adequate habitacionais conditions.
In the great and average cities it is common the presence of slum quarters and tenement houses depessimas conditions for housings. Fact demonstrated for the presence of people liveing in the streets under deviadutos and bridges without having no social accompaniment. These disordered problems are mainly caused peloxodo agricultural that it provokes, most of the time, problemassociais, by means of the unpreparedness of the cities pair such phenomena. Forfeiture the jobs are not enough extending if the market of trabalhoinformal or population living of peaks. These people who had left its lugaresseguros to live an adventure, finish more suffering to each time in the great emdias cities.