Variation de la Composition Minérale et Transport á Longue Distance au Cours de la Croissance de la Lame chez Laminaria hyperborea (Gunn) Fosl.

Abstract

Summary Analyses of P, K, Na, Ca and Mg, were performed from December to April (1975–1976) in the two laminae of Laminaria hyperborea . The changes of the pattern during the growth of the alga, are shown to be specific to the elements: 1. The P amount increased in the young lamina and diminished simultaneously in the older one. Besides, experiments carried out with 32 P showed that the radio-element moved in a basipetally orientated long distance transport. Consequently, the phosphorus redistribution is considered to be controlled by the respective properties of the receptor organ (young lamina) and the donator one (old lamina). 2. The increase of the K amount, quicker in the very young growing lamina than in the older one, is in good harmony with the exclusively basipetal migration of 86 Rb. 3. The continual increase of the Ca amounts in the older tissues, corroborated the apparent immobility of 45 Ca when supplied to the old lamina.