“…However, sweet potato SPAE is in close association with plant vacuolar processing enzymes of seeds from phylogenetic analysis (Chen et al, 2004). Vacuolar processing enzymes have been reported to be in association with the degradation and mobilization of globulin storage proteins during seed germination and seedling growth in Phaseolus vulgaris (Senyuk et al, 1998), Vigna mungo , Vicia sativa (Schlereth et al, 2000;Schlereth et al, 2001), and Arabidopsis thaliana (Gruis et al, 2002). In Vigna mungo, VmPE-1 has been demonstrated to increase in the cotyledons of germinating seeds and was involved in the post-translational processing of a vacuolar cysteine endopeptidase, designated SH-EP, which degraded seed storage proteins (Okamoto & www.intechopen.com Transgenic Plants -Advances and Limitations 244 Minamikawa, 1999).…”