网页Glutelin, the most abundant SSP in rice, has a superior nutritional value due to higher lysine content and greater digestibility (Takaiwa et al., 1999). Based on the amino acid sequence similarity, 15 glutelin-encoding genes are known and can be divided into four subfamilies: GluA, GluB, GluC, and GluD ( Table 1 ) ( Kawakatsu et al., 2008 ).