不同霜冻胁迫时间下霜桑叶品质的变化OA

To investigate the impact of frost stress on the quality of frost mulberry leaves,this study systematically in-vestigated the dynamic changes of seven key quality indicators(moisture content,fat content,flavonoids content,to-tal phenols content,fiber content,tannin content and protein content)in mulberry leaves under different frost stress periods(6,12,18,and 24 d)using eight mulberry varieties.The results showed that most quality indicators(fat and moisture content)peaked under short-term stress(6 d,5℃).Pearson correlation analysis revealed significant(p<0.05)correlations among these indicators.Based on principal component analysis,five key indicators,fat con-tent,total phenols content,flavonoids content,fiber content,and protein content,were proposed.The comprehen-sive evaluation revealed that Jingbo mulberry achieved the highest score under6-day(5℃)frost stress,followed by Jing mulberry under 24-day(0℃)frost stress.Hanza mulberry,Wubao mulberry,and Fengchi2 exhibited compa-rable quality under short-term stress,ranking third,fourth and fifth,respectively.This study provides theoretical support for frost-resistant mulberry breeding and the precise harvesting of frost mulberry leaf.