Comprehensive analysis of molecular basis for Mn homeostasis in plants

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K18660
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plant nutrition/Soil science
• Research Institution: Kochi University
• Principal Investigator: Ueno Daisei 高知大学, 教育研究部総合科学系生命環境医学部門, 准教授 (90581299)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: マンガン / ホメオスタシス / イネ / 耐性 / 集積性 / 吸収 / トランスポーター / 輸送体

Outline of Final Research Achievements

This study aimed to elucidate the molecular basis for Mn homeostasis in rice, which is Mn accumulating and tolerant crop. The plasma membrane-localized MTP9 was localized to the proximal side of endodermal and exodermal cells of roots. This exporter was involved in efficient root Mn uptake in co-operation with NRAMP5, an influx transporter localized at the distal side of the same cell layers. On the other hand, MTP8.2 was tonoplast-localized transporter expressed in both shoots and roots, and involved in the high Mn tolerance. MTP11 was expressed in old leaf blades, which accumulated more Mn than other tissues, at vegetative growth stage. MTP11 was localized to trans-Golgi and mediates Mn tolerance to a lesser extent than tonoplast-localized transporters. At reproductive stage, MTP11 was expressed in reproductive organs and might contribute to high fertility in submerged paddy with high Mn availability.

Free Research Field

植物栄養学