期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 66, 期 1, 页码 317-331出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eru425
关键词
Growth reduction; low-affinity nitrate transporter; mutant; potassium recycling; overexpression; rice
资金
- China 973 program [2011CB100300]
- National R&D Program for Transgenic Crops
- 111 Project [12009]
- Ministry of Education of China
- PAPD of Jiangsu Higher Education Institutions project
- BBSRC [BB/L010305/1, BB/JJ004561]
- John Innes Foundation
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00004166, BBS/E/C/00004967, BB/L010305/1] Funding Source: researchfish
- BBSRC [BBS/E/C/00004967] Funding Source: UKRI
Plant proteins belonging to the NPF (formerly NRT1/PTR) family are well represented in every genome and function in transporting a wide variety of substrates. In this study, we showed that rice OsNPF2.4 is located in the plasma membrane and is expressed mainly in the epidermis, xylem parenchyma, and phloem companion cells. Functional analysis in oocytes showed that OsNPF2.4 is a pH-dependent, low-affinity NO3- transporter. Short-term (NO3-)-N-15 influx rate, long-term NO3- acquisition by root, and upward transfer from root to shoot were decreased by disruption of OsNPF2.4 and increased by OsNPF2.4 overexpression under high NO3- supply. Moreover, the redistribution of NO3- in the mutants in comparison with the wild type from the oldest leaf to other organs, particularly to N-starved roots, was dramatically changed. Knockout of OsNPF2.4 decreased rice growth and potassium (K) concentration in xylem sap, root, culm, and sheath, but increased the shoot: root ratio of tissue K under higher NO3-. We conclude that OsNPF2.4 functions in acquisition and long-distance transport of NO3-, and that altering its expression has an indirect effect on K recycling between the root and shoot.
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