[Study on seed quality of Achyranthes bidentata].

Objective: To study the seed quality of Achyranthes bidentata from different sources and establish a standard of seed quality grading.

Method: Seed weight and moisture content determination, germination test, purity analysis were carried out by 100 grains method, high-temperature drying, double deck filter paper and GB/T354. 3-Seed Testing for Crops methods respectively. Eight collections were planted in several field plots.

Result: The 1 000 grains weight of 33 collections is 0.69 to 3.54 g with a variance coefficient 24.83%, the germination rate between 19.02% to 99% with a variance coefficient 38.24%. Seed moisture content and purity showed no significantly difference. K-means cluster analysis showed that 33 collections were divided into 3 grades: the first grade including 23 collections, the second and third grade including 5 collections respectively. Eight collections showed different field growth and yield characters.

Conclusion: There are significant differences in seed quality of A. bidentata, so the classification management is needed in medicinal materials market. Germination test is an effective method before cultivating.