n nnnThe concentration of essential mineral nutrients in the edibleportion of plants such as grains may affect the nutritionalvalue of these foods, while concentrations of toxic mineralsin the plant are matter of food safety. Minerals taken up bythe roots from soils are normally redirected at plant nodesbefore they are finally transported into developing seeds. However,the molecular mechanisms involved in this process have not beenidentified so far. Herein, we report on a transporter (Lsi6)responsible for the redirection of a plant nutrient at the node.Lsi6 is a silicon transporter in rice (Oryza sativa), and itsexpression in node I below the panicles is greatly enhancedwhen the panicle is completely emerged. Lsi6 is mainly localizedat the xylem transfer cells located at the outer boundary regionof the enlarged large vascular bundles in node I. Knockout ofLsi6 decreased Si accumulation in the panicles but increasedSi accumulation in the flag leaf. These results suggest thatLsi6 is a transporter involved in intervascular transfer (i.e.,transfer of silicon from the large vascular bundles coming fromthe roots to the diffuse vascular bundles connected to the panicles).These findings will be useful for selectively enhancing theaccumulation of essential nutrients and reducing toxic mineralsin the edible portion of cereals.展开▼
机译：ABSTRACTn n
n TOP n <字体颜色= 464c53>抽象 n 介绍 n 结果 n 讨论 n 方法 n 参考文献 n n nnn可食用的 部分中必需矿物质营养素的浓度诸如谷物之类的植物可能会影响这些食品的营养价值，而植物中有毒矿物质的浓度与食品安全有关。通常，从土壤中被根吸收的矿物质在最终运入发育中的种子之前会在植物节点处重新定向。但是，到目前为止，尚未确定 参与该过程的分子机制。在本文中，我们报道了一个转运蛋白（Lsi6） ，其负责节点处植物养分的重定向。 Lsi6是水稻中的硅转运蛋白（ Oryza sativa < / I>），并且当穗完全出现时，其在穗下方节点I中的 表达大大增强。 Lsi6主要位于结节I中扩大的大血管束的外边界区域 的木质部转移细胞中。 Lsi6的敲除减少硅在穗上的积累但在剑叶中的 硅积累增加。这些结果表明， Lsi6是一种参与血管间转移的转运蛋白（即， 将硅从 的大血管束中转移到根部。 这些发现将有助于选择性地增强食用食物中 的基本营养素积累并减少有毒矿物质 谷物的一部分。展开▼
