The Role of Gibberellins in Regulation of Nitrogen Uptake and Physiological Traits in Maize Responding to Nitrogen Availability

International Journal of Molecular Sciences
Yubin WangMingcai Zhang

Abstract

Modified gibberellin (GA) signaling leads to semi-dwarfism with low nitrogen (N) use efficiency (NUE) in crops. An understanding of GA-mediated N uptake is essential for the development of crops with improved NUE. The function of GA in modulating N uptake capacity and nitrate (NO3-) transporters (NRTs) was analyzed in the GA synthesis-deficient mutant zmga3ox grown under low (LN) and sufficient (SN) N conditions. LN significantly suppressed the production of GA1, GA3, and GA4, and the zmga3ox plants showed more sensitivity in shoots as well as LN stress. Moreover, the higher anthocyanin accumulation and the decrease of chlorophyll content were also recorded. The net NO3- fluxes and 15N content were decreased in zmga3ox plants under both LN and SN conditions. Exogenous GA3 could restore the NO3- uptake in zmga3ox plants, but uniconazole repressed NO3- uptake. Moreover, the transcript levels of ZmNRT2.1/2.2 were downregulated in zmga3ox plants, while the GA3 application enhanced the expression level. Furthermore, the RNA-seq analyses identified several transcription factors that are involved in the GA-mediated transcriptional operation of NRTs related genes. These findings revealed that GAs influenced N uptake involved in the tra...Continue Reading

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Citations

Apr 11, 2021·Journal of Integrative Plant Biology·Rongna WangZhongming Fang
Aug 28, 2021·International Journal of Molecular Sciences·Chang Pyo HongHojin Ryu

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Methods Mentioned

BETA
RNA-seq
microsensor
PCR

Software Mentioned

Cytoscape
cBot Cluster Generation System
agriGO
R package WGCNA
PlantRegMap
EdgeR
KOBAS
Ensemble
Java
TopHat2

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