Litchi is a famous tropical fruit, which has an important position in the tropical agricultural economy of China. But it also faces with the problem that pests and diseases undermine litch fruit at growing and harvest storing. Lectin is a special protein which has one or more catalytic domain, which could distinguish and bind with monosaccharide or oligosaccharides of cell surface. Thus, lectin can improve resistance of plants to diseases and pests. It is necessary to intensive study expression of lectin ge...