**5.1.2 Viability of rootstock and soybean scion**

Viability of the rootstock and soybean scion is critical for success of the graft. Generally, we use plant materials with strong resistance and adaptability as rootstocks and choose soybean varieties with better integrated traits as scion, so that soybean scion can gain enough water and nutrition from rootstock during the process of grafting and the survival rate of grafting is improved.
