| 北萱草与大苞萱草区分为不同物种的核型证据 |
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| 引用本文： | 熊治廷,陈心启,洪德元.北萱草与大苞萱草区分为不同物种的核型证据[J].中国科学院研究生院学报,1998,36(1):53-57. |
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| 作者姓名： | 熊治廷 陈心启 洪德元 |
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| 摘 要： | 在文献中，小萱草Hemerocallis dumortierii Morr、北萱草H．esculenta Koidz．和大苞萱草H．mid-
dendorfii Trautv et Mey被认为属于同一生物学复合体，并被处理为同一物种的不同变种。本文比较分
析了北萱草及大苞萱草的核型。北萱草和大苞萱草的核型分别为:2n=2x=22=12m+8sm+2T和2n
=2x=22=10m+6sm+4st+2T。两个类群的核型差异水平已超出种内变异水。另外，大苞萱草以其
具有宽大苞片包裹的类头状花序，并且产黑龙江和吉林东部，南达辽宁干山地区，但绝不分布到大陆40°
N以南地区而显著不同于分布华中、华北的北萱草。根据核型、外部形态及地理分布资料的综合分析，北萱草与大苞萱草应区分为不同物种，而不是同一物种的不同变种；同时，在系统发育上大苞萱草比北萱草进化。
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| 关 键 词： | 北萱草 大苞萱草 核型 |
Karyotype Evidence for Distinguishing Between Hemerocallis esculenta and H. middendorfii |
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| XIONG Zhi-Ting,CHEN Sing-Chi,HONG De-Yuan.Karyotype Evidence for Distinguishing Between Hemerocallis esculenta and H. middendorfii[J].Journal of the Graduate School of the Chinese Academy of Sciences,1998,36(1):53-57. |
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| Authors: | XIONG Zhi-Ting CHEN Sing-Chi HONG De-Yuan |
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| Abstract: | Hemerocallis dumortierii, H. esculenta and H. middendorfii were considered
to belong to a biological complex, and were treated as different varieties of the same species,
H. dumortierii. The present authors observed and compared the karyotypes of H. esculen-
ta and H. middendorfii. Two plant samples for each of the species were studied. One sam-
ple of H. esculenta was from Wuán County, Hebei Province, at an altitute of 1000 m, the
other from Shennongjia, Hubei Province, altitute 2100 m. The two samples of H. middendorfii were respectively from Antu County, at an altitute of 700 m, and Tonghua, altitute
500 m, in Jilin Province. The karyotypes are 2n＝2x=22=12m+8sm+2T for H. escu-
lenta, while 2n＝2x＝22=10m+6sm+4st+2T for H. middendorfii. The karyotypical
difference between the two taxa was obviously not intraspecific but interspecific. Based on
the karyotype data as well as the morphological and phytogeographical data available, it is
considered that H. esculenta and H. middendorfii should be recognized as different
species, instead of different varieties of the same species as in literature, and that H. mid-dendorfii is more advanced than H. esculenta. |
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| Keywords: | Hemerocallis esculenta H．middendorfii Karyotype |
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