Abstract: In order to test the regeneration ability of different explants, the leaves, cotyledons and hypocotyls of T. patula'Little Hero Golden' were cultured on 4 kinds of media, MS + NAA 0.5 mg·L-1+ BA 1.0 mg·L-1, MS + NAA 1.0mg·L-1 + BA 2.0 mg·L-1, MS + NAA 1.5 mg·L-1 + BA 2.0 mg·L-1 and MS + IAA 3.0 mg·L-1 + BA 2.5 mg·L-1. The results showed that the regeneration ability of leaves was higher than that of cotyledons and hypocotyls. The leaves were then cultured on 9 kinds of MS media with different combinations of NAA and BA, and the highest regeneration frequency was obtained on MS medium supplemented with 1.5 mg·L-1NAA and 1.0 mg·L-1 BA, and the regeneration rate was up to 75%. The medium was tested for other 4 genotypes, and all the lines were successfully regenerated with frequencies from 70% to 85%. All the regenerated plantlets developed into complete plants of normal morphological characteristics.

Key words: Tagetes patula L., Genotypes, Explants, Plant regeneration