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miR156b from Soybean CMS Line Modulates Floral Organ Development
Xianlong Ding,Hui Ruan,Lifeng Yu,Qiang Li,Qijian Song,Shouping Yang,Junyi Gai 한국식물학회 2020 Journal of Plant Biology Vol.63 No.2
The miR156 and plant specifc transcription factor SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) are known for their function regulating plant growth and development. In this study, we identifed 20 GmSPLs which are targeted by gma-miR156b via plant small RNA target and degradome analysis. And we found high transcript levels of gma-miR156b and its targeted GmSPLs in the fower of soybean cytoplasmic male sterility (CMS) line and its maintainer. The gma-miR156b direct cleavage of GmSPL2b and GmSPL9b, and have opposite expression levels during early fower buds development. We observed a high expression level of GUS protein in the anthers of the line with pgma-MIR156b::GUS reporter. Over-expression of the gma-miR156b precursor in Arabidopsis inhibited foral organ development, including reduced anther size and the amount of pollen grains per anther etc. Like miR156-targeted SPL genes, non-targeted GmSPL8s were also down-regulated in early fower bud development of soybean CMS line compared with its maintainer line, which might act in concert with miR156-targeted SPL genes to participate in the foral organ development. Quantitative real time PCR (qRT-PCR) suggested that miR156/SPL modulates foral organ development by regulating the expression of LATERAL ORGAN BOUNDARIES DOMAIN22 (LBD22), LBD36, AGAMOUS-LIKE30 (AGL30) and AGL104. Our fndings will facilitate understanding of the biological functions of miR156/SPL in foral organ development of soybean CMS.
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