Effects of exogenous growth regulators and bud picking on grafting of grapevine hard branches

•ABT and CIPC have a concentration effect on the application of the mechanized hard-branched grafted grape propagules.•250 mg/L of ABT can increase SS activity, sucrose concentrations, and accumulation of IAA and ZR of the graft union.•400 mg/L CIPC inhibits the growth indexes of grafted grape propagules and reduced the survival rate.