Physiological Studies in the Mucorales

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Abstract
Some previous work on zygotropism in Mucor is briefly reviewed, and further observations confirming earlier studies presented. In addition to positive zygotropism between (+) and (−) zygophores, there is claimed to be a corresponding ‘repulsion’ between zygophores of the same mating type, (+) from (+) and (−) from (−). The stimulus appears to be transmitted by the diffusion of a volatile substance from one zygophore to another. A tentative explanation of the phenomena described is advanced, based on two postulated volatile hormones, each evolved by zygophores of one mating type only, stimulating growth in zygophores of its own mating type and retarding it in those of the opposite type.

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