@conference{
author = "Pavlović, Jelena and Samardzic, Jelena and Maksimović, Vuk and Nikolic, Miroslav",
year = "2013",
abstract = "Silicon (Si) and iron (Fe) are respectively the second and the fourth most abundant minerals in the earth's crust. While the essentiality of Fe is discovered at the middle of the 19111 century, Si is still not fully accepted as an essential element for higher plants. However, Si is proved to alleviate multiple environmental stresses in plants (e.g. metal excess, drought, salt, lodging, diseases and pests). Fe deficiency is considered to be one of the major limiting factors for crop production worldwide, also affecting human health in developing countries.
Root responses (strategies) to a lack of Fe have mainly been studied in nutrient solution experiments devoid of Si, therefore information on the interactions between these two mineral elements in plants is still limited.
Here we investigated how Si ameliorates Fe deficiency in Strategy 1 plant species (all dicots and monocots with the exception of grasses, which belong to Strategy 2), such as cucumber, sunflower, tomato and soybean, with the focus on the mechanism involved in Fe acquisition from the rhizosphere and utilization of root apoplastic Fe. A combined approach was performed including analyzes of apoplastic Fe pool, the components of reduction-based Fe acquisition machinery (using stable isotope 57Fe and expression of CsFR02, Cs/RT1, and CsHA 7) and accumulation of Fe-mobilizing compounds (carboxylates, phenolics and flavonoids), along with
the expression of related genes involved in their biosynthesis, in the roots of model plant (cucumber).
Our study indicates for the first time that the role of Si in the alleviation of Fe deficiency stress includes: 1) increase of the apoplastic Fe pool in roots; 2) stimulation of Fe acquisition at the ea rly stage of Fe deficiency stress through regulation of gene expression levels of proteins involved in this process; and 3) increase of the accumulation of Fe-mobilizing compounds in roots. Indeed, this work provides new evidence for the beneficial role of Si in plant nutrition and in perspective can be of practical importance in the development of new sustainable measures for controlling Fe chlorosis in calcareous soils, which in general are low in available Si.",
publisher = "Serbian Plant Physiology Society; Institute for Biologica l Research ,,Sinisa Stankovic", University of Belgrade, Bulevar despota Stefana 142, 11060 Belgrade, Serbia",
journal = "1st International Conference on Plant Biology - Programme and Abstracts, June 4-7, 2013, Subotica, Serbia",
title = "Silicon mediates iron acquisition by Strategy 1 plants",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2496"
}