益母草的核型研究

<正> 益母草Leonurus japonicus Houtt, (L. heterophyllus Sweet, L. artemisia(Lour,) S. Y. Hu)是唇形科益母单属的一、二年生草本植物,全国各地均产,朝鲜和日本也有分布,生于旷野向阳处,海拔可达3400米。 益母草是著名的重要中药,《神农本草经》和明李时珍的《本草纲目》列为上品,性微寒,味辛苦,具有活血调经、祛瘀生新之功效,为妇科要药,果实名“茺蔚子”,能清肝明目。

A STUDY ON THE KARYOTYPE OF LEONURUS JAPONICUS HOUTT

Leonurus japonicus Houtt. (L. heterophyllus Sweet, L. artemisia (Lour.) S. Y. Hu) (Labiatae) is a famous Chinese medicinal herb having been used lor thousands of years in gynaecological diseases. A karyotypic analysis of the species herewith presented is being the first time, and the chromosome in growing tip cell of root was found to be 2n = 20, with median and subme-dian constrictions. Measurements in microns of the chromosomes are given in-Table 1. Photomicrographys of the chromosome complements and an idiogram of the karyotype are shown in fig. 1 .& 2 respectively. According to the terminology defined by Leven et al. , the karyotype formula is K(2n) = 20 = 12m + 8sm, belonging to "lA" type of Stebbins' karyotypic symmetry , and should therefore be generally considered as a rather primitive one.