Research Progress on the Swelling Mechanism of Millettia speciosa Champ.Root
Niudali(Millettia speciosa Champ.)refers to the root of Millettia speciosa,a plant belonging to the genus Millettia within the Fabaceae family,possesses the medicinal effects of nourish the lungs,strengthen the muscles and activate the nerves.Niudali has been a traditional Chinese medicinal plant and was listed in the new resource food catalog in 2018.Its market applications cover traditional Chinese medicine health supplements,general food products,and daily chemical industries,highlighting its significant economic value and market potential.Niudali utilizes its perennial tuberous root as the medicinal component,which based on whether the roots swell and form tubers during cultivation,can be classified into swollen roots(tuberous roots,tubers)and non-swollen roots(stem roots).The swelling root has high degree of fleshy and starch content,and the non-swelling root has high degree of lignification and strong fiber.The quality of tubers is the preferred indicator for market evaluation of the quality of niudali,which is directly related to the yield and the planting income of farmers,and is an important direction for agricultural production and new breed cultivation.Therefore,it is the necessary way to study the swelling mechanism of niudali to improve the yield and product quality.This study mainly focuses on the basic characteristics,the chemical composition,and the characteristic metabolites between the two kinds of roots.Mover,the environmental factors,the gene regulation,and endogenous hormones which affect the formation of niudali tubers were summarized,aiming to provide a theoretical basis for the explanation of the swelling mechanism of niudali tubers.