Federal Laboratory

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).