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MiR172b-TOE1/2 module regulates plant innate immunity in an age-dependent manner.

Biochem Biophys Res Commun. 2020 Oct 22;531(4):503-507. Epub 2020 Aug 15
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摘要


Plant innate immunity varies with age and plant developmental stages. Recently, we reported that Arabidopsis thaliana microRNA miR172b regulates FLS2 transcription through two transcription factors: TARGET OF EAT1 (TOE1) and TOE2. Although the flg22-triggered immune responses were investigated in 2-d-old or even younger toe1/toe2 mutant and miR172b over expression (OE) transgenic plants, the FLS2-mediated immune responses in older plants remain uncharacterized yet. In this work, we analyzed the flg22-triggered immune response in 6-d-old toe1/toe2 and miR172b OE plants. We found that unlike 2-d-old plants, 6-d-old Col-0, toe1/toe2 and miR172b OE plants exhibit comparable flg22-triggered immune responses. Strikingly, miR172b precursor in 6-d-old Col-0 plants upon flg22 treatment reached to a very high level, consequently, the TOE1/2 protein level under this condition was very low or almost undetectable, which explains why 6-d-old WT seedlings are very similar to toe1/toe2 seedlings or miR172b OE plants with respect to the flg22-triggered immune responses. Taken together, our study reveals that miR172b-TOE1/2 module regulates plant innate immunity in an age-dependent manner.

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