对苞萱草的核型研究

本文报道用光学显微镜观察对苞萱草Ｈｅｍｅｒｏｃａｌｉｓｆｕｌｖａ（Ｌ．）Ｌ．ｖａｒ．ｏｐ ｐｏｓｉｔｉｂｒａｃｔｅａｔａＨ．ＫｏｎｇｅｔＣ．Ｊ．Ｗａｎｇ，ｖａｒ．ｎｏｖ．的染色体，按全国第一次植物染色体学术讨论会建议的标准进行核型分析。研究结果表明，对苞萱草体细胞染色体数目２ｎ＝２２，核型公式ｋ（２ｎ）＝２２＝１２ｍ＋６ｓｍ＋４ｓｔ，属于Ｓｔｅｂｂｉｎｓ核型的２Ｂ型。甘肃萱草属植物的核型可分为两大类群，对苞萱草的核型属于第二类群。对苞萱草与萱草Ｈ．ｆｕｌｖａ（Ｌ．）Ｌ．的核型较接近，为新变种的确立提供了细胞学方面的依据。

A study on karyotype of Hemerocallis fulva var. oppositibracteata

In this paper, the karyotype of Hemerocallis fulva (L.) L. var. oppositibracteata H. Kong et C. J. Wang, var. nov. has been studied. The result shows that the number of the somatic chromosome of H. fulva var. oppositibracteata is 22, the karyotype formula is k (2 n)=22=12 m 6 sm 4 st, and belongs to 2B type of Stebbins karyotypic symmetry. The karyotypes of Hemerocallis in Gansu were divided into two groups, H. fulva var. oppositibracteata belongs to the second group. H. fulva var. oppositibracteata is similar to H. fulva in the karyotype. It has provided a basis on cytology for establishment of new variety.