Effects of 10 Dwarfing Interstocks on Cold Resistance of ‘Tianhong 2’ Apple

The lack of dwarf stock with good cold resistance has affected the production apples in northern China. Annual dormant branches ‘Tianhong 2’ apple were grafted on 10 different interstocks (the rootstocks seedlings Malus hupehensis var. Pingyiensis) as test materials. Among these interstocks, Huang 6, 244, NO.1, 53, 24-5, ZC9-3, Jizhen 1 newly developed by us (Apple Research Group Hebei Agricultural University), and three degrees (GM256–with strongest resistance, SH40–with stronger M9–with poor resistance) used controls. semi-lethal temperature (LT50) related physiological indexes overwintering process studied. Based comprehensive indexes, effects analyzed. results showed that kinds quite different. order from strong to weak was follow: GM256 > 6 244 >NO.1> 53 24-5 ZC9-3 >Jizhen SH40 M9. purpose this study screen out provide some basis for selection utilization cultivation further promote development industry