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Author Hu B., Wang W., Ou S., Tang J., Li H., Che R., Zhang Z., Chai X., Wang H., Wang Y., Liang C., Liu L., Piao Z., Deng Q., Deng K., Xu C., Liang Y., Zhang L., Li L., Chu C.
Title Variation in NRT1.1B contributes to nitrate-use divergence between rice subspecies.
Abstract:
Asian cultivated rice (Oryza sativa L.) consists of two main subspecies, indica and japonica. Indica has higher nitrate-absorption activity than japonica, but the molecular mechanisms underlying that activity remain elusive. Here we show that variation in a nitrate-transporter gene, NRT1.1B (OsNPF6.5), may contribute to this divergence in nitrate use. Phylogenetic analysis revealed that NRT1.1B diverges between indica and japonica. NRT1.1B-indica variation was associated with enhanced nitrate uptake and root-to-shoot transport and upregulated expression of nitrate-responsive genes. The selection signature of NRT1.1B-indica suggests that nitrate-use divergence occurred during rice domestication. Notably, field tests with near-isogenic and transgenic lines confirmed that the japonica variety carrying the NRT1.1B-indica allele had significantly improved grain yield and nitrogen-use efficiency (NUE) compared to the variety without that allele. Our results show that variation in NRT1.1B largely explains nitrate-use divergence between indica and japonica and that NRT1.1B-indica can potentially improve the NUE of japonica.
Journal Nat. Genet.
Country China
Volume 47(7)
Pages 834-8
Year 2015
PubMed ID 26053497
PubMed Central ID -
DOI 10.1038/ng.3337
URL -
Relation
Gene NPF6.5 _ _
INSD -
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain 		-
Stages in Each Organ
- Muant Lines (Gene) 		-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase