The Endodermis Is the Major Control Point for Radial Transport of Humic Substances into the Vascular System of Plants
In order to understand humic substance (HS) uptake by plants and its entrance into the plant vascular system, a microautoradiography approach using tritium-labeled HS was applied. Wheat seedlings were used as test plants. The data obtained clearly demonstrated preferential radial transport of HS by the apoplastic pathway. Epidermal and cortex cells did not remove significant proportions of humic substances, and the endodermis was shown to be the major control point for their radial transport.
KeywordsInteraction with plants Vascular system Autoradiography Tritium Endodermis Apoplastic way
- Kulikova, N.A., I.V. Perminova, G.A. Badun, M.G. Chernysheva, O.V. Koroleva, and E.A. Tsvetkova. 2010. Estimation of uptake of humic substances from different sources by Escherichia coli cells under optimum and salt stress conditions by use of tritium-labeled humic materials. Applied and Environmental Microbiology 76: 6223–6230.CrossRefGoogle Scholar