Two leguminous tree species differ in growth and ion uptake in Hoagland solution: phosphorus toxicity in Amur maackia
1996
Aiello, A.S. | Graves, W.R.
Hydroponic culture of tree seedlings is used commonly to study root biology; however, we have found that two species of woody legumes differ in their responses to this practice. Seedlings of Amur maackia (Maackia amurensis Rupr. & Maxim.) and black locust (Robinia pseudoacacia L.) were cultured in 1, 5, 10, 25, 50, and 100% Hoagland solution #1 for 5 weeks. Total dry mass of black locust increased with increasing solution concentration up to 50%. Amur maackia dry mass was greatest in 5% solution. Bronzing, chlorosis, and necrosis occurred on leaves of Amur maackia in solutions 10%, and symptom severity increased with solution strength. Leaf phosphorus (P) content of Amur maackia increased from 0.40 to 1.95% of dry mass as solution strength increased from 5 to 50%. Amur maackia grown in a soil-based medium and irrigated with 50% solution showed no foliar toxicity symptoms and P content of the leaves of these plants was 0.279%. Laminae of Amur maackia had higher manganese (Mn) content than laminae of black locust a solution concentrations above 5%. Levels of calcium (Ca) and magnesium (Mg) in laminae of Amur maackia suggest an enhanced ability of this species to absorb ions from its medium. Results indicate no elemental deficiencies for either species. We conclude that black locust can be grown hydroponically using standard methods. However, growth of Amur maackia in solution is inhibited at concentrations of Hoagland solution #1 > 10%, suggesting a sensitivity to the availability of ions and perhaps an enhanced ability to sequester ions from its medium.
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