Non‐metabolic binding of aluminum to roots of loblolly pine and honeylocust

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Abstract
Roots of honeylocust (Gleditsia triacanthos L.) and loblolly pine (Pinus taeda L.) were exposed to Al in nutrient solution culture at a temperature of 1 C and pH 4. Non‐metabolic accumulation was significantly time and concentration dependent. A rapid phase of Al uptake lasted approximately 4 hours followed by a persistent slow phase. Strong concentration dependence of Al binding was observed between 50 and 1000 uM Al in solution. The pattern of Al binding was similar for the two species. However, the roots of the more Al sensitive honeylocust contained less Al than the roots of the Al resistant loblolly pine. In 4 hours at 1 C, seedling roots bound 21 to 30% of the Al found in seedlings grown in identical solutions for 35 days at 22 C.