Abstract
Summary Researches on the cytophysiology of secretion, excretion and recretion. I. Sectal nettaria. Flower buds, flowers and young fruits of Canna indica, Hemerocallis citrica, Kniphophia Krooki and Funkia ovata were fixed at different stages of development. The structural changes in the sectal nectaria of these species were observed, and the following four main phase distinguished: I. Differentiation, from the first appearance of the epidermal primordia in the sectal nectarium (ENS) to its complete differentiation; II. Accumulation, characterized by the passage of a noticeable amount of material from the carpellar parenchym to the cells of the ENS; III. Expulsion, wich is the true phase of secretion of the material previously accumulated; IV. Restoration, wich includes the period of life of the cells of the ENS, after the end of the' secretion phase (this last phase may be observed only on those nectaria wich do not degenerate soon after the third phase). Nucleic acid (NA) was estimated by means of the F...
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