miRNA and Degradome Sequencing Identify miRNAs and Their Target Genes Involved in the Browning Inhibition of Fresh-Cut Apples by Hydrogen Sulfide.

Journal of Agricultural and Food Chemistry
Chen ChenWenzhong Hu

Abstract

Surface browning is the major limit for the shelf life of fresh-cut apples, and hydrogen sulfide (H2S) treatment can effectively inhibit the browning. However, the molecular mechanism on how fresh-cut apples respond to H2S was poorly understood. MicroRNAs (miRNAs) are a class of endogenous small noncoding RNAs, which regulate multiple crucial biological processes in almost all aspects of the life cycle. Herein, 12 small RNA libraries and one mixed degradome library were constructed from control and H2S-treated fresh-cut apples immediately after treatment (C0 and S0) and 6 d of storage (C6 and S6) at 4 °C. The results identified nine (three upregulated and six downregulated) and 10 (two upregulated and eight downregulated) differentially expressed miRNAs (DEmiRNAs) in S0 versus C0 and S6 versus C6, respectively. The target genes of DEmiRNAs were transcription factors and functional proteins. The miR156 targeting SPL, miR164 targeting NAC, miR319 targeting TCP4, GAMYB, and acyl-CoA-binding protein 4, and miR6478 targeting patatin-like protein 2 might play important roles in the browning inhibition of fresh-cut apples by H2S via regulating the ROS, phenylpropanoid, and lipid metabolism. The results give valuable information for fu...Continue Reading

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