Document Type



Numerous experiments have been performed in the endeavor to identify the factors which underlie the sexual dimorphism in dioecious species of flowering plants (2, 7, 8, 9, 11). The discovery in 1920 (5) that the photoperiod has a fundamental relationship to inception of reproductive processes has given renewed impetus to studies of sex expression in dioecious species of plants in the belief that it also may be conditioned by a similarly specific stimulus. Studies of physico-chemical attributes such as respiration, tissue fluid reaction, and the role of specific cell components have disclosed certain functional processes which are correlated with six differences. Though none of these has as yet been shown to be causative in its effect on sex expression, considerable evidence discloses that redox systems of tissue fluids are intimately correlated with sex (1, 3, 6). This investigation supplies data on the acid reserves on buffering action and pH of tissue fluids of staminate and pistillate plants of hemp and spinach. This study endeavors to correlate existing information on hydrion concentrations of tissue fluids in the two sexes of dioecious plants with new data on buffer capacity. Such data may in turn permit correlations with studies on oxidase activities which distinguish the sexes of dioecious species (1, 3, 4, 6).

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Proceedings of the Iowa Academy of Science





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©1953 Iowa Academy of Science, Inc.



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