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Abstract
Growth of cultivated Vaccinium species on soils with a pH above 6.0 is inhibited and production can be extended to these types of soils only after extensive soil modifications. V. arboreum is a wild species that grows on soils with higher pH values. The aim of the present study was to characterize differences in nitrate and iron assimilation in cultivated vs. wild Vaccinium. Genotypes from V. corymbosum and V. arboreum were grown hydroponically with different nitrate and iron concentrations. Nitrate and iron uptake were significantly greater in V. arboreum compared with V. corymbosum. This was correlated with increased nitrate reductase and ferric chelate reductase activities and increased tissue concentrations of reduced nitrogen and iron in V. arboreum. The wild species, V. arboreum, clearly exhibits an increased ability to assimilate nitrate and iron compared with V. corymbosum. This greater capacity for assimilation may play a significant role in this species' broader soil adaptation.
