| role of exudation of organic acids and phosphate in aluminum tolerance of four tropical woody species. | responses of melaleuca leucadendra (l.) l., melaleuca cajuputi powell, acacia auriculiformis a. cunn. ex benth. and eucalyptus camaldulensis dehnh. to aluminum (al) toxicity at low ph are poorly understood. we investigated effects of low ph and exudation of ligands by roots on al tolerance of these species. seedlings were grown hydroponically in nutrient solutions at ph 4.2 or 3.5 containing alcl3 at concentrations ranging from 0 to 4 mm al. the presence of 4 mm al at ph 3.5 depressed growth in ... | 2003 | 12975128 |