Fig.1

Process of grafting with hypocotyl rootstocks of tung trees A: Graft rootstocks germinated after 30 days of seed sand storage; B: The rootstock of the hypocotyl of tung tree and scion have similar thickness; C: Align the rootstock and scion incisions after grafting; D: Tung tree seedlings ready for transplantation after grafting and binding."

Table 1

Effects of different species rootstock, grafting and binding methods on grafting survival rate of tung tree sprouts"

Fig.2

Growth of tung tree grafted seedlings with different grafting and binding methods A: The growing situation after 30 days of binding with plastic film for splitting graft; B: The growing situation after 30 days of binding with plastic film for bonding graft; C: The growth situation after 30 days of fixing with aluminum foil for splitting graft; D: The growth situation after 30 days of fixing with aluminum foil sheets for bonding graft. 以上均以千年桐作砧木嫁接1个月拍照。The above photos are all taken in one month after graft with millennium tung as the rootstock."

Fig.3

Effects of different lengths of upper and lower stem segments, petioles and incisions on grafting survival rate A: The different lengths of upper stem segments of the scion, from left to right: 0.5 cm, 1.0 cm, 1.5 cm; B: The different lengths of scion incisions, from left to right: 1.0 cm, 1.5 cm, 2.0 cm; C: The different lengths of the lower stem segments of the scion, from left to right: 2.0 cm, 2.5 cm, 3.0 cm; D: The different lengths of petioles, from left to right: 0.1 cm, 0.5 cm, 1.0 cm; E: Survival rate of grafted seedlings under different treatments of spike, petiole, and cut length. 图E中不同的小写字母代表上、下茎段、叶柄及切口不同长度处理下成活率差异显著（P < 0.05）。The different lowercase letters in the figure E represent significant differences (P<0.05) in survival under different lengths of upper and lower stem segments, petioles, and incisions."

Table 2

Effects of rootstocks under different treatments on grafting survival rate"

Table 3

Effects of different grafting periods on survival rate, seedling height and ground diameter of tung tree seedlings with hypocotyl grafting"

Table 4

Effect of different height of seedbed on the survival rate of grafting and the high ground diameter of seedlings"

Fig.4

Growth status of tung tree grafted seedlings in different periods A: Axillary buds germinate in 5 days after the grafted seedlings are transplanted to the field; B: The overall growth status of seedlings after 10 days of grafting; C: Growth status of seedlings after 20 days of grafting; D: Wound heals after 25 days of grafting; E: Tung tree seedlings with fully healed wounds after grafting; F: The growth status of wounds after grafting with thinner scions; G: The overall growth of seedlings after 90 days of grafting; H: Wound healing status after 90 days of grafting; I: Growth status of tung tree seedlings with hypocotyl grafting after winter defoliation."

Fig.5

Wound healing and microstructure observation after transplanting of tung tree grafted seedlings A: Grafted seedlings of tung trees with hypocotyle rootstocks after 10 days of transplantation; B: Grafted seedlings of tung trees with hypocotyle rootstocks after 20 days of transplantation; C: Grafted seedlings of tung trees with hypocotyle rootstocks after 30 days of transplantation; D: Grafted seedlings of tung trees with hypocotyle rootstocks after 50 days of transplantation; E: Grafted seedlings of tung trees with hypocotyle rootstocks after 70 days of transplantation; F: Wound growth status of tung tree seedlings after 10 days of grafting with hypocotyle rootstocks; G: Wound growth status of tung tree seedlings after 20 days of grafting with hypocotyle rootstocks; H: Wound growth status of tung tree seedlings after 30 days of grafting with hypocotyle rootstocks; I: Wound growth status of tung tree seedlings after 50 days of grafting with hypocotyle rootstocks; J: Wound growth status of tung tree seedlings after 70 days of grafting with hypocotyle rootstocks; K: Microanatomy structure of the contact area between the rootstock and the scion after 10 days of wound growth from hypocotyle grafting; L: Microanatomy structure of the contact area between the rootstock and the scion after 20 days of wound growth from hypocotyle grafting; M: Microanatomy structure of the contact area between the rootstock and the scion after 30 days of wound growth from hypocotyle grafting; N: Microanatomy structure of the contact area between the rootstock and the scion after 50 days of wound growth from hypocotyle grafting; O: Microanatomy structure of the contact area between the rootstock and the scion after 70 days of wound growth from hypocotyle grafting. St：砧木Rootstock；Sc：接穗Scion；IL：嫁接隔离层Graft isolation layer."