Les hormones des algues. Etat actuel des connaissances. III-Rôle des hormones dans les modalités de croissance et de développement des thalles.

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Abstract
Numerous laboratory experiments with cultures, and some tests in the sea, have shown that auxins, gibberellins, cytokinins and several substances of hormonal nature play a part in the regulation of the great physiological functions of algae during the different stages of their life. Phytohormones participate in the regulation of growth and development effecting not only the mechanisms of cellular elongation and division but also those of morphogenesis, organogenesis and cellular differentiation. They also play a part in other physiological mechanisms of development, e.g., tropisms, periodisms, regeneration and apical dominance. Little is known about the precise modalities of their action, the site and the exact importance of the different mechanisms of cellular elongation, division and differentiation in algae.

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