通过对３个典型杂交组合的核改酶活性与杂种优势及产质量关系分析结果表明，甜菜６叶期杂种１代核酸酶（ＲＮａｓｅ）活性在各组合内呈负优势，均低于双亲平均值，与双亲问差异达显著水平，与根产量和产糖量呈显著负相关，因而该期的核糖核酸酶活性可作为入选优势杂种参考生理指标。 The results of the relationship between the activity of the nuclear modification enzyme and the heterosis and the yield and quality of the three typical hybrid combinations showed that RNase activity of the 6-leaf stage hybrid beet had a negative predominance in all combinations, both of which were lower than the average of both parents , And the difference between the two parents reached a significant level, and the root yield and sugar content was significantly negatively correlated, so the ribonuclease activity of the period can be used as the reference hybrids elite physiological indicators.