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首页> 外文期刊>Soils >Evidence for the Root-Uptake of Arsenite at Lateral Root Junctions and Root Apices in Rice (Oryza sativa L.)
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Evidence for the Root-Uptake of Arsenite at Lateral Root Junctions and Root Apices in Rice (Oryza sativa L.)

机译：水稻（Oryza sativa L.）侧根交界处和根尖处砷吸收的证据。

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摘要

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.
机译：通过Lsi1和Lsi2 Si转运蛋白在里海带吸收砷（As（III）i）约占水稻芽中As（III）i吸收量的75％，因此约占芽As（III）的25％我被其他运输途径占用。我们假设没有Casparian带的区域（侧根结和根尖）可以将As（III）i转运到根中。我们分析了土壤种植和溶液种植植物的水稻根系中的元素分布以及砷的浓度，形态和定位。对于溶液生长的植物，施用As（III）i后，我们将根切成根距根部距离的函数，并使用共聚焦显微镜，同步加速器X射线荧光成像和光谱学分析了横截面。我们观察到As（III）i升高与水稻的侧根结和根尖相关。 As（III）i在侧面的根部交界处进入碑石，并从根尖的横截面130-140μm处径向渗透到根内部，这些横截面没有里海带。我们的研究结果表明，侧根交界处和水稻根尖是As（III）i转运到水稻根中的热点，但是对笋形As的贡献尚需进一步研究。

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