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The node, a hub for mineral nutrient distribution in graminaceous plants

机译:该节点是禾本科植物中矿质养分分布的枢纽

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摘要

Mineral elements, including both essential and toxic elements, are delivered to different tissues after they are taken up from the roots, but the mechanism (or mechanisms) underlying the distribution remains poorly understood. In graminaceous plants, this distribution occurs in nodes, which have a complex, well-organized vascular system. A transfer of mineral elements between different vascular bundles is required, especially for preferential distribution to developing tissues that have low transpiration but high nutrient requirements. This intervascular transfer is mediated by various transporters localized at different cells in the node. In this opinion article, we propose four modes of distribution for different mineral elements: xylem-switch, phloem-tropic, phloem-kickback, and minimum-shift, based on specific molecular transport processes identified in the nodes mainly of rice (Oryza sativa). We also discuss the prospects for future studies on mineral nutrient distribution in the nodes
机译:矿物质元素(包括必需元素和有毒元素)从根部吸收后,会被递送到不同的组织,但是对于这种分布所基于的一种或多种机理仍然知之甚少。在禾本科植物中,这种分布发生在结点中,这些结点具有复杂且组织良好的维管系统。需要矿物质元素在不同维管束之间的转移,特别是为了优先分配到蒸腾作用低但营养需求高的发育组织。这种血管间转移是由位于结节中不同细胞处的各种转运蛋白介导的。在这篇观点文章中,我们基于主要在水稻(Oryza sativa)节点上识别的特定分子转运过程,提出了四种不同矿物质元素的分布模式:木质部转换,韧皮部回归,韧皮部回弹和最小移位。 。我们还讨论了节点中矿质养分分布的未来研究前景

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