Journal
TRENDS IN PLANT SCIENCE
Volume 19, Issue 9, Pages 556-563Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tplants.2014.05.007
Keywords
node; preferential mineral nutrient distribution; intervascular transfer; xylem transfer cell; transporter; graminaceous plants
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [23688009, 22119002, 24248014]
- Grants-in-Aid for Scientific Research [23688009] Funding Source: KAKEN
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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.
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