Boron tolerance in barley is mediated by efflux of boron from the roots.

@article{Hayes2004BoronTI,
  title={Boron tolerance in barley is mediated by efflux of boron from the roots.},
  author={Julie Hayes and Robert J. Reid},
  journal={Plant physiology},
  year={2004},
  volume={136 2},
  pages={3376-82}
}
Many plants are known to reduce the toxic effects of high soil boron (B) by reducing uptake of B, but no mechanism for limiting uptake has previously been identified. The B-tolerant cultivar of barley (Hordeum vulgare L.), Sahara, was shown to be able to maintain root B concentrations up to 50% lower than in the B-sensitive cultivar, Schooner. This translated into xylem concentrations that were approximately 64% lower and leaf concentrations 73% lower in the tolerant cultivar. In both cultivars… CONTINUE READING
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