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The process of ripening and softening in grape begins at veraison and is closely related to the depolymerization of pectin components. A variety of enzymes are involved in pectin metabolism and one class of enzyme, pectin lyases (PLs), have been reported to play an important role in softening in many fruits; however, little information is available on the VvPL gene family in grape. In this study, 16 VvPL genes were identified in the grape genome using bioinformatics methods. Among them, VvPL5 , VvPL9 , and VvPL15 had the highest expression levels during grape ripening, which suggests that these genes are involved in grape ripening and softening. Furthermore, overexpression of VvPL15 affects the contents of water-soluble pectin (WSP) and acid-soluble pectin (ASP) in the leaves of Arabidopsis and significantly changes the growth of Arabidopsis plants. The relationship between VvPL15 and pectin content was further determined by antisense expression of VvPL15 . In addition, we also studied the effect of VvPL15 on fruit in transgenic tomato plants, which showed that VvPL15 accelerated fruit ripening and softening. Our results indicate that VvPL15 plays an important role in grape berry softening during ripening by depolymerizing pectin.

VvPL15 Is the Core Member of the Pectate Lyase Gene Family Involved in Grape Berries Ripening and Softening