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Cytotaxonomic study of genus Hymenasplenium (Aspleniaceae) in Xishuangbanna, southwestern China
Cheng, X; Murakami, N
AbstractThe gametic chromosome numbers of seven Hymena-splenium (Aspleniaceae) species from Xishuangbanna, Yunnan Prov., China, were investigated. All the examined individuals of H.obscorum, H.cheilosorum and H. latipinnum were sexual diploids with n = 39 chromosomes. Intraspecific cytological variation was found in H. excisum, which has a sexual diploid (n = 39) and a tetraploid (n = 78). Only a triploid apogamous cytotype (n = ca. 117) was found in H. laterepens. Hymenasplenium apogamum showed the most complicated intraspecific variation and included a sexual diploid (n = 39), a sexual tetraploid (n = 78) and an apogamous triploid (n = ca.117). This work reports for the first time the sexual diploids of H.cheilosorum and H. apogamum, which are only apogamous elsewhere in east Asia, Himalayas and Indochina. These results may indicate that this area is one of the diversity centers of Hymenasplenium. Most of the above species have chromosome numbers based on x = 39. In contrast, H. costarisorum contains a sexual diploid (n = 36) and a sexual tetraploid (n = 72), indicating that its basic number is x = 36.
KeywordApogamy Aspleniaceae Chromosome Number Cytotaxonomy Hymenasplenium Yunnan Province
Subject AreaPlant Sciences
Indexed BySCI
WOS Research AreaPlant Sciences
WOS SubjectPlant Sciences
WOS IDWOS:000077874600004
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Kyoto Univ, Grad Sch Sci, Dept Bot, Kyoto 6068502, Japan
2.Acad Sinica, Kunming Inst Bot, Kunming 650204, Peoples R China
Recommended Citation
GB/T 7714
Cheng, X,Murakami, N. Cytotaxonomic study of genus Hymenasplenium (Aspleniaceae) in Xishuangbanna, southwestern China[J]. JOURNAL OF PLANT RESEARCH,1998,111(1104):495-500.
APA Cheng, X,&Murakami, N.(1998).Cytotaxonomic study of genus Hymenasplenium (Aspleniaceae) in Xishuangbanna, southwestern China.JOURNAL OF PLANT RESEARCH,111(1104),495-500.
MLA Cheng, X,et al."Cytotaxonomic study of genus Hymenasplenium (Aspleniaceae) in Xishuangbanna, southwestern China".JOURNAL OF PLANT RESEARCH 111.1104(1998):495-500.
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