大青叶砧木对钟花樱品系樱花花期及抗寒性的影响OA

[Objective]To study the effect of Daqingye rootstock on flowering time and cold resistance of Cerasus campanulata strain.[Meth-od]From 2019 to 2021,the grafted seedlings of four varieties of Cerasus campanulata strain were used as control,and the grafted seedlings of the above varieties of Daqingye rootstock were observed.The four varieties were Cerasus campanulata'Hongfenjiaren',Cerasus campanulata'Zhongguohong',Cerasus campanulata'Kawazu-zakura'and Cerasus campanulata'Double-flowered'.The difference of flowering time and the phenomenon of branch drying of annual branches were compared.Physiological indexes such as malondialdehyde(MDA)content,soluble protein content,proline content and superoxide dismutase(SOD)activity were determined under low temperature stress of 0,-5,-10,-15 and-20℃,respectively,and the membership function method was used for comprehensive evaluation.[Result]The results showed that the first flowering time of the grafted seedlings of Daqingye rootstock of the above four varieties was 8.7 days,8.3 days,7.3 days and 6.3 days later than that of the grafted seedlings of Cerasus campanulata rootstock,respectively.Under the condition of overwintering in the open field,the phenomenon of branch drying of other seedlings was more serious except for the slight phenomenon of branch drying of Cerasus campanulata'Kawazu-zakura'of Daqingye rootstock.With the decrease of temperature,MDA content and soluble protein content of all seedlings continued to increase,and proline content and SOD activity showed a trend of first increasing and then decreasing.The membership function analysis showed that the cold resistance ability of the grafted seedlings of the four varieties of Daqingye rootstock ranked high.[Conclusion]Compared with the grafted seedlings of Cerasus campanulata rootstock,the grafted seedlings of Daqingye rootstock had a later flowering time and a stron-ger cold resistance,and Cerasus campanulata'Kawazu-zakura'of Daqingye rootstock could overwinter in the open field in the areas with good small environment in Beijing.