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  • Title: miR827 orchestrates the regulation of SPX-MFS1 and SPX-MFS5 with the assistance of lncRNA767 to enhance phosphate starvation tolerance and maize development.
    Author: Chen L, He J, Wang X, Zhang S, Pan J, Peng J, Mo B, Liu L.
    Journal: Plant Biotechnol J; 2024 Dec; 22(12):3489-3504. PubMed ID: 39284226.
    Abstract:
    MicroRNA827 (miR827) is functionally conserved among different plant species and displays species-specific characteristics, but the mechanisms by which miR827 regulates phosphate (Pi) starvation tolerance and maize development remain elusive. We found that miR827 selectively targets the Pi transporter genes SPX-MFS1 and SPX-MFS5. miR827 overexpression improved the Pi starvation tolerance, plant architecture and grain yield and quality, whereas miR827 suppression yielded a contrasting phenotype. In addition, we identified a specific long noncoding RNA (lncRNA767) that serves as a direct target and a facilitator of miR827 and can stabilize the SPX-MFS1 and SPX-MFS5 transcripts, leading to their translation inhibition. The orchestrated regulation of SPX-MFS1 and SPX-MFS5 modulates PHR1; 1 and PHR1; 2, which are critical transcription factors in Pi signalling, and thereby affects the expression of downstream Pi starvation-induced genes. Together, these findings demonstrate that miR827, assisted by lncRNA767, enhances SPX-MFS1 and SPX-MFS5 suppression and thus exerts a significant impact on Pi homeostasis and several essential agronomic traits of maize.
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