Influence des régulateurs de croissance sur la prolifération,l'activité peroxydasique et les isoperoxydases de la suspension cellulaire deSilene alba

Growth ofSilene alba (MILLER) E. H. L. KRAUSE cells, as well as their peroxidase pattern and activity are studied. Cells were grown in the presence and absence either of IAA, or NAA or 2,4-D. The subculture is dependent upon the growth regulator used to sustain the growth of cells. For 14 days' passages, subculture is possible with 2,4-D (5 x 10^-7M) or NAA (10^-5M) but impossible with IAA or without any growth regulators. Cells grown using 2,4-D or NAA in the medium contain a smaller number of isoperoxidases and have lower activities than those grown using IAA or no growth regulator. The nature of growth substances does not affect the compartimontation of the peroxidase; in fact the bulk of the peroxidaso activity is always liable to the ionic wall bound fractions. Tho electrophorotic mobilities of peroxidase isoenzymes detected in the modium are not the same as those of tho eytoplasmic isoenzymes. Cell cultures grown with and without growth regulators show different patterns of modium peroxidase activities. Some forms are present both in cells and media and some other only in the media; this may indicate that there is some selection made in tho cells for retention of particulars forms; the others could be secreted as exoenzymes shortly after they are synthesized in the cells. The nature of the growth regulator used could act on the release of certain isoperoxidases. These results are discussed from the viewpoint of the correlation of isoperoxidase patterns with the possibility of subculture.