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Responses of two hydroponically grown marigold species, Tagetes erects L. 'pumpkin Crush' and T. patula L. 'Janie Yellow', to Mn concentrations of 0.5 mg·liter -1 -1 and NO3 as the N source, T. erects absorbed twice the Mn per gram of dry matter as T. patula. T. erecta accu- mulated higher concentration of Mn in the shoot than in the root irrespective of the N source. T. patula accumulated higher concentration of Mn in the roots with the NO 3 source while NH4NO3 shifted the Mn accumulation to the shoot. Growth of both species was suppressed with 10 mg Mn/liter and the suppression was greater with the NO 3 source than with the NH4NO3. These results indicate an interspecific response to Mn concentration as well as an N source influence on the uptake of Mn in marigold grown under hydroponic conditions. Manganese-related abnormal growth was encountered in the production of marigold, with Mn toxicity occurring more intensely in some genotypes than in others (Biernbaum et al., 1988). The reason for this differential behavior of marigold genotypes to Mn tox- icity was not known. Genotypic differences to Mn toxicity were observed in other plant species and were attributed to the tolerance mechanism of shoots to high Mn concentra- tions and not to reduced uptake of Mn by plants (Horst, 1980).

Interspecific Responses of Marigold to Manganese as Influenced by Nitrogen Source