synthase (PaKCS6) (Khadivi-Khub 2015; Balbontı́n et al. 2014, 2013; Kasai et al. 2008; Huang et al. 2006; Lu et al. 2006; Wang et al. 2006; Moctezuma et al. 2003; Schuch et al. 1991; Peet 1992; Cuartero et al. 1981) have also been identified to be closely associated with fruit cracking, which also shows the importance of the fruit pericarp in cracking.