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  • Title: Characterization of the Genes Involved in Malic Acid Metabolism from Pear Fruit and Their Expression Profile after Postharvest 1-MCP/Ethrel Treatment.
    Author: Wang L, Ma M, Zhang Y, Wu Z, Guo L, Luo W, Wang L, Zhang Z, Zhang S.
    Journal: J Agric Food Chem; 2018 Aug 22; 66(33):8772-8782. PubMed ID: 30074786.
    Abstract:
    In this study, five genes involved in malic acid (MA) metabolism, including a cytosolic NAD-dependent malate dehydrogenase gene ( cyNAD-MDH), a cytosolic NADP-dependent malic enzyme gene ( cyNADP-ME), two vacuolar H+-ATPase genes ( vVAtp1 and vVAtp2), and one vacuolar inorganic pyrophosphatase gene ( vVPp), were characterized from pear fruit based on bioinformatic and experimental analysis. Their expression profile in "Housui" pear was tissue-specific, and their expression patterns during fruit development were diverse. During "Housui" pear storage, MA content decreased, which was associated with the downregulated transcripts of MA metabolism-related genes and cyNAD-MDH activity and higher cyNADP-ME activity. The response of MA metabolism to postharvest 1.5 μL L-1 1-MCP fumigation and 0.5 mL L-1 ethrel dipping was distinct: 1-MCP fumigation upregulated gene expression and cyNAD-MDH activity and suppressed cyNADP-ME activity, and thus maintained higher MA abundance when compared with those in the control; on the other hand, an opposite behavior was observed in ethrel-treated fruit.
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