What is xylem required for? The xylem has evolved as a tissue to transport water and minerals from the roots to the tips of leaves using tubes of dead tracheary elements arranged end-toend. In addition, the xylem is required for supporting the plant body vertically on land. Thick secondary cell walls on xylem cells give the cells physical strength to help support the plant body and resist water pressure.

DOI: 10.1016/j.cub.2014.10.010

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@article{OhashiIto2014Xylem, title={Xylem}, author={Kyoko Ohashi-Ito and Hiroo Fukuda}, journal={Current Biology}, year={2014}, volume={24} }