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From the first issue of 2018, Soils has changed its name to Soil Systems.

Open AccessArticle

Evidence for the Root-Uptake of Arsenite at Lateral Root Junctions and Root Apices in Rice (Oryza sativa L.)

Department of Plant & Soil Sciences, University of Delaware, Newark, DE 19716, USA
Delaware Biotechnology Institute, University of Delaware, Newark, DE 19711, USA
Stanford Synchrotron Radiation Lightsource, Menlo Park, CA 94025, USA
Author to whom correspondence should be addressed.
Received: 12 July 2017 / Revised: 8 August 2017 / Accepted: 11 August 2017 / Published: 14 August 2017
(This article belongs to the Special Issue Rhizosphere Processes)
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The uptake of arsenite (As(III)i) at the Casparian band via Lsi1 and Lsi2 Si transporters is responsible for ~75% of shoot As(III)i uptake in rice and, therefore, ~25% of shoot As(III)i is taken up by other transport pathways. We hypothesized that areas devoid of Casparian bands—lateral root junctions and root apices—can transport As(III)i into roots. We analyzed the elemental distribution and As concentration, speciation, and localization in rice roots from soil-grown and solution-grown plants. With solution-grown plants dosed with As(III)i, we sectioned roots as a function of distance from the root apex and analyzed the cross-sections using confocal microscopy coupled to synchrotron X-ray fluorescence imaging and spectroscopy. We observed elevated As(III)i associated with lateral root junctions and root apices in rice. As(III)i entered the stele at lateral root junctions and radially permeated the root interior in cross-sections 130–140 µm from the root apex that are devoid of Casparian bands. Our findings suggest that lateral root junctions and rice root apices are hot-spots for As(III)i transport into rice roots, but the contribution to shoot As requires further research. View Full-Text
Keywords: rice; arsenite; transport; synchrotron XRF imaging rice; arsenite; transport; synchrotron XRF imaging

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Seyfferth, A.L.; Ross, J.; Webb, S.M. Evidence for the Root-Uptake of Arsenite at Lateral Root Junctions and Root Apices in Rice (Oryza sativa L.). Soils 2017, 1, 3.

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