CsSPDS amino acid sequences showed high degree identity compared with known SPDS from other species. And SPDS from Coffea arabica has the highest similarity to CsSPDS.

• CsSPDS的氨基酸序列与其它已知的亚精胺合成酶具有高度的同源性，其与咖啡亚精胺合成酶同源性最高(identity，87%25)。