There appears to be a definite relationship between organic acid accumulation and ion absorption by roots. An understanding of the importance of CO/sub 2/ fixation and its relationship to ion absorption by plant roots is basic to the comprehension of the reactions in soil-root environment. Results are presented of a preliminary investigation into these phenomena. There is an indication that some factors known to influence the fixation of CO/sub 2/ by phosphoenolpyruvate carboxylase and malic dehydrogenase have similar effects on malate accumulation and K absorption by roots. The evidence indicates that the mechanisms responsible for K accumulation in root tissue are quite different when roots are exposed to solutions in the presence or in the absence of HCO/sub 3/.
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Jackson et al. (1959) studied this question.