Chemotaxis of Bracken Spermatozoids the Role of Bimalate Ions
نویسنده
چکیده
Fern spermatozoids respond chemotactically to concentration gradients of malic or maleic acid salts (Pfeffer, 1884). They respond weakly to salts of a few other dicarboxylic acids, but do not respond to succinate or fumarate (Shibata, 1911; Rothschild, 1956). Previous workers concluded, without adequate justification, that the malate ion, and not the undissociated malic acid molecule, is chemotactically active; but no consideration has been given to the possibility that the bimalate ion may be the active species. A malate-dependent aggregation of bracken spermatozoids in a pH gradient has been briefly reported (Brokaw, 1957). In this paper, this phenomenon and several related observations are examined in greater detail.
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