不同遮阴处理对鱼腥草生长、生理特性及类黄酮成分积累的影响OA

Houttuynia cordata Thunb.(HC)is a shade-tolerant medicinal plant,and light is one of the key factors affecting its growth and quality.This study investigates the effects of shading on the growth,physiological characteristics and quality of HC,providing a basis for its ecological cultivation.This study conducts a cultivation experiment with a control group(0%shading rate)and four treatment groups(20%,40%,60%,and 80%shading rate),and analyzes and compares the differences in growth indicators(leaf length,leaf width,plant height,biomass,etc.),physiological and biochemical indicators(peroxidase,malondialdehyde),and quality-related indicators(total flavonoids,total anthocyanins)of the aboveground parts of HC under different shading treatments.The results show that in terms of growth indicators,the trait quality of HC improves with increasing shading rates,in the order of 80%shading rate>60%shading rate>40%shading rate>20%shading rate>full sunlight expose;In terms of physiological and biochemical indicators,the POD activity of HC decreases with increasing light intensity,while the MDA content rises;Additionally,the total flavonoid content reaches its maximum at 20%shading rate,whereas the total anthocyanin content gradually decreases with increasing light intensity.In conclusion,moderate shading is beneficial for the vigorous growth of HC and the accumulation of flavonoid secondary metabolites in HC.It is recommended to adopt an ecological planting mode,such as intercropping with tall crops like Zea mays(corn)and Coix lacryma-jobi(Job's tears)or understory interplanting,to enhance both the quality and economic value of HC.