Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep18192
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Funding
- Ministry of Science and Technology of China [2011CB100302]
- National Nature Science Foundation of China [31071846, 31172022, 31372122, 31471936]
- Innovative Research Team Development Plan of the Ministry of Education of China [IRT1256]
- 111 Project [12009]
- PAPD in Jiangsu Province of China
- China Scholarship Council (CSC)
- Innovative Plan of Jiangsu Province of China [CXLX13_280, 568]
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The morphological plasticity of root systems is critical for plant survival, and understanding the mechanisms underlying root adaptation to nitrogen (N) fluctuation is critical for sustainable agriculture; however, the molecular mechanism of N-dependent root growth in rice remains unclear. This study aimed to identify the role of the complementary high-affinity NO3- transport protein OsNAR2.1 in NO3- -regulated rice root growth. Comparisons with wild-type (WT) plants showed that knockdown of OsNAR2.1 inhibited lateral root (LR) formation under low NO3- concentrations, but not under low NH4+ concentrations. N-15-labelling NO3- supplies (provided at concentrations of 0-10 mM) demonstrated that (i) defects in LR formation in mutants subjected to low external NO3- concentrations resulted from impaired NO3- uptake, and (ii) the mutants had significantly fewer LRs than the WT plants when root N contents were similar between genotypes. LR formation in osnar2.1 mutants was less sensitive to localised NO3- supply than LR formation in WT plants, suggesting that OsNAR2.1 may be involved in a NO3--signalling pathway that controls LR formation. Knockdown of OsNAR2.1 inhibited LR formation by decreasing auxin transport from shoots to roots. Thus, OsNAR2.1 probably functions in both NO3 uptake and NO3--signalling.
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