The main objective of the study was the quantitative determination of the reserve starch and of the total soluble proteins, in correlation with the dynamics of the α-glucanphosphorylase activity from the caryopses, subjected to germination under laboratory conditions, belonging to two graminaceae species from the cultivated (Panicum miliaceum) and spontaneous (Bromus sterilis) flora. The experimental results obtained put into evidence a differentiated dynamics for both the enzymatic activity and protein and starch concentration, as a function of species - on one side - and germination time - on the other.