Iron deficiency induces sulfate uptake and modulates redistribution of reduced sulfur pool in barley plants

Functional Plant Biology : FPB
Stefania AstolfiRoberto Pinton

Abstract

We studied the possibility that the sulfur (S) assimilatory pathway might be modulated by iron (Fe) starvation in barley, as a consequence of plant requirement for an adequate amount of reduced S to maintain methionine and, in turn, phytosiderophore biosynthesis. Barley seedlings were grown with or without 100 µm FeIII-EDTA, at three S levels in the nutrient solution (S2 = 1200, S1 = 60, and S0 = 0 µm sulfate) in order to reproduce conditions of optimal supply, latent and severe deficiency, respectively. Fe deprivation increased root cysteine content irrespective of the S supply. However, this increase was not associated with either higher rates of 35SO42- uptake or increased expression of the gene for the high-affinity sulfate transporter, HvST1, and these roots failed to increase their activities of ATP sulfurylase (ATPS) and O-acetylserine(thiol) lyase (OASTL). We observed a significant increase in 35SO42- uptake rate (+76%) only in Fe-deficient S1 plants and we found an increase in root ATPS activity only in S0 plants. We observed an increase of ATPS enzyme activity in leaves of S1 and S2 plants, most likely suggesting increased S assimilation followed by translocation of thiols (Cys) to the root. Taken together, our result...Continue Reading

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Citations

Jul 26, 2015·Journal of Experimental Botany·Juan ChenHai-Lei Zheng
Feb 26, 2016·Plant Signaling & Behavior·Juan ChenHai-Lei Zheng
Apr 8, 2009·Planta·Sabrina ZuchiStefania Astolfi
Nov 18, 2011·Journal of Experimental Botany·S AstolfiR Pinton
Dec 19, 2009·Journal of Experimental Botany·Stefania AstolfiRainer Hoefgen
Oct 21, 2010·Journal of the Science of Food and Agriculture·Francesco IacuzzoStefano Cesco
Aug 7, 2021·Frontiers in Plant Science·Stefania AstolfiStefano Cesco

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