Abstract

Mycorrhizae of Amanita muscaria , Cenococcum geophilum , and Pisolithus tinctorius were synthesized in sterile flask cultures. The substrate was adjusted to different acid pH-values. A. muscaria showed the optimal mycorrhization above pH 4, C. geophilum at about pH 4 and P. tinctorius below pH 3.5. In addition to a variable degree of mycorrhization, no aberrant morphological and ultra-structural growth patterns could be detected. The bare roots of Pinus sylvestris tolerate pH values even below 3.0. Abortion of apical meristems in root tips is discussed as a morphological indicator for acid substrates.

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