title: The node, a hub for mineral nutrient distribution in graminaceous plants.
abstract: 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.
authors: Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki 710-0046, Japan.
authors: Naoki
authors: N
authors: Yamaji
authors: Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki 710-0046, Japan. Electronic address: maj@rib.okayama-u.ac.jp.
authors: Jian Feng
authors: JF
authors: Ma
mesh_terms: D001692:Biological Transport / Q000502:physiology; D018506:Gene Expression Regulation, Plant / Q000502:physiology; D008903:Minerals / Q000378:metabolism*; D012275:Oryza / Q000033:anatomy & histology / Q000378:metabolism*; D010940:Plant Proteins / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism
chemical_list: D008903:Minerals; D010940:Plant Proteins
keywords: graminaceous plants; intervascular transfer; node; preferential mineral nutrient distribution; transporter; xylem transfer cell