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Silicification of Root Tissues

1
Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15 Bratislava, Slovakia
2
Institute of Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
3
Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, 845 23 Bratislava, Slovakia
4
Comenius University Science Park, 841 04 Bratislava, Slovakia
*
Author to whom correspondence should be addressed.
Plants 2020, 9(1), 111; https://doi.org/10.3390/plants9010111 (registering DOI)
Received: 21 November 2019 / Revised: 9 January 2020 / Accepted: 10 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Root Development)
Silicon (Si) is not considered an essential element, however, its tissue concentration can exceed that of many essential elements in several evolutionary distant plant species. Roots take up Si using Si transporters and then translocate it to aboveground organs. In some plant species, root tissues are also places where a high accumulation of Si can be found. Three basic modes of Si deposition in roots have been identified so far: (1) impregnation of endodermal cell walls (e.g., in cereals, such as Triticum (wheat)); (2) formation of Si-aggregates associated with endodermal cell walls (in the Andropogoneae family, which includes Sorghum and Saccharum (sugarcane)); (3) formation of Si aggregates in “stegmata” cells, which form a sheath around sclerenchyma fibers e.g., in some palm species (Phoenix (date palm)). In addition to these three major and most studied modes of Si deposition in roots, there are also less-known locations, such as deposits in xylem cells and intercellular deposits. In our research, the ontogenesis of individual root cells that accumulate Si is discussed. The documented and expected roles of Si deposition in the root is outlined mostly as a reaction of plants to abiotic and biotic stresses. View Full-Text
Keywords: abiotic and biotic stress; cell wall; endodermis; phytoliths; root; silicon; silicon transporters abiotic and biotic stress; cell wall; endodermis; phytoliths; root; silicon; silicon transporters
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Lux, A.; Lukačová, Z.; Vaculík, M.; Švubová, R.; Kohanová, J.; Soukup, M.; Martinka, M.; Bokor, B. Silicification of Root Tissues. Plants 2020, 9, 111.

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