BnALMT7-A4 encodes an aluminium-activated malate transporter that enhances aluminium tolerance in both Brassica napus L. and Arabidopsis thaliana

We have identified a putative aluminium-activated malate transporter, BnALMT7-A4, that is induced by Al treatment in roots. We engineered Arabidopsis and Brassica overexpressing BnALMT7-A4 to generate Al-tolerant plants with improved root growth and reduced Al accumulation in root tips. Transcriptomic analysis of the Al-tolerant Brassica roots demonstrated modification of stress- and toxicity-specific gene expression. Thus, we have discovered a new way of making rapeseed, an important crop, more tolerant to Al stress.