Background
Juhe, which is derived from seeds of citrus (Citri reticulata Semen), is wildly used as a traditional Chinese medicine. Its original plants have numinous variety, and new varieties are constantly emerging, especially in recent years. The decline in the market share of traditional varieties each year, has resulted in a shortage of Juhe resources, and nontraditional Juhe varieties have been used clinically without research. Thus Juhe resources vary significantly. Furthermore, most of new varieties are hybrids, with significant differences in genes, active ingredients. Therefore, a further research is needed on Nontraditional medicinal varieties.
Methods
In this study, the genetic diversity, shape and size, and flavonoids content of 35 different batches of Juhe samples, from different source, were analyzed base on SRAP molecular markers, a stereo microscope, and HPLC. Then correlation analysis was performed using these data.
Results
The genetic backgrounds of traditional medicinal varieties (TMV) and nontraditional medicinal varieties (N-TMV) differed significantly, and TMV were closely related to some Citrus ‘Ponkan’ samples. Seeds of TMV and N-TMV differ based on shape, size and number. In addition, flavonoid compounds and level in the seeds of TMV and N-TMV also showed a significant difference. Five batches of C. reticulata ‘Ponkan’ samples collected from Zigong, Meishan, Neijiang, Nanchong and Jiangyou were closely related to the traditional medicinal variety Citrus reticulata ‘Dahongpao’,based on genetic relationship, shape and sizes, as well as flavonoids content.
Conclusins:
A total of 5 C. reticulata ‘Ponkan’ samples, including Zigong No. 7, Meishan No. 21, Neijiang No. 27, Nanchong No. 32, and Jiangyou No. 34, were closely related to the traditional medicinal variety C. reticulata ‘Dahongpao’ in genetic relationship, seeds’ characteristics and sizes, and flavonoids content. These varieties could serve as a new medicinal variety.