Abstract:

The cuttings of Yalin No.6 were collected from the nursery of immature rootstock, and the rooting experiment of hardwood cutting was carried out. IBA, ABT1, NAA, GGR6, IAA and other plant growth regulators were used to prepare different concentrations of solution and water was used as the control for the cutting immersion, then the cuttings were soaked and cut in sterile medium. After 45 days of shading film moisturizing environment and 15 days of open-air drip irrigation environment, the rooting effect was detected by sampling, significant difference analysis and multiple comparative analysis. The results showed that there were significant differences in rooting effect among different treatments. IAA, IBA and GGR6 had higher rooting rate and sprout growth under appropriate ratio. The rooting rates of A1, G3 and G2 were 75.6%, 56.9% and 52.8% respectively, which were significantly higher than those of other treatments. The changes of rooting rate and callus occurrence rate were not consistent. There are three types of rooting: cortex rooting, callus rooting and mixed rooting. In the experiment, the cutting rooting was mainly cortex rooting, supplemented by mixed rooting. IAA and other treatments can improve the cortex rooting, while NAA and IBA with humic acid could promote the rooting of callus. IAA and other treatments can improve the rooting rate of cortex, 250 mg · L^-1 IAA treatment had the best rooting effect, 500 mg · L^-1 GGR6 treatment was the second. Considering the cost advantage and operation convenience, it was suggested to use 500 mg · L^-1 GGR6 treatment to cultivate persimmon rootstock cuttings.

Key words: persimmon, rootstock, cuttage, rooting rate, callus