Organic acids detoxify Alt external to the root--commonly organic acids released Malate--Al-tolerant cultivars of wheat Citrate- Al-tolerant cultivars of snapbean(四季豆), maize, Cassia tora, soybean Cassia tora,决明属 oxalate-buckwheat and taro(F- malate and citrate-Al-tolerant triticale(X Triticosecale Wittmack) rapeseed, oats, radish and rye18 Malate--Al-tolerant cultivars of wheat Citrate-Al-tolerant cultivars of snapbean（四季豆）, maize , Cassia tora, soybean; Cassia tora,决明属 oxalate-buckwheat and taro(芋) malate and citrate-Al-tolerant triticale (× Triticosecale Wittmack), rapeseed, oats, radish and rye. Organic acids detoxify Al3+ external to the root—commonly organic acids released