Sugar dicotyledonous plants

Despite increased citrate accumulation in roots of Zn-deficient rice plants, root exudation of citrate was not enhanced. However, in distinct adapted rice cultivars, enhanced release of citrate could be observed in the presence of high bicarbonate concentrations in the rooting medium, a stress factor, which is frequently associated with Fe and Zn deficiency in calcareous soils (235) (Hajibo-huid, unpublished). This bicarbonate-induced citrate exudation has been related to improved Zn acquisition in bicarbonate-tolerant and Zn-efficient rice genotypes (Fig. 9) (23S). Increased exudation of sugars, amino acids, and phenolic compounds in response to Zn deficiency has been reported for various dicotyledonous and monocotyledonous plant species and seems to be related to increased... 

Until recently it was assumed that the Calvin cycle was the only universally feasible pathway of CO2 fixation, even though the data for maize and sugar cane were not in complete agreement with this view. In 1966, Hatch and Slack demonstrated that, in fact, there is another pathway of CO2 fixation in higher plants. It was first demonstrated in gra-mineae, and then later in other monocotyledons and in dicotyledons too. 

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