Cytotaxonomic study of ferns of Yunnan, southwestern China

Kato, Masahiro; Nakato, Narumi; Cheng, Xiangdong; Iwatsuki, Kunio

doi:10.1007/bf02489407

Cited by 36 publications

(22 citation statements)

References 12 publications

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“…The latter were obtained mainly from exploring data accessible in Tropicos (http://www.tropicos.org/), published chromosome number lists [43], and from pertinent publications [37,44]. In the context of polystichoid ferns, we also used the information provided at David Barrington's Polystichum website (http://www.uvm.edu/∼dbarring/polystichum.htm).…”

Section: Methodsmentioning

confidence: 99%

The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

Dyer

Guo

et al. 2012

Journal of Botany

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The disparate distribution of apomixis between the major plant lineages is arguably one of the most paradoxical phenomena in plant evolution. Ferns are particularly interesting for addressing this issue because apomixis is more frequent than in any other group of plants. Here, we use a phylogenetic framework to explore some aspects of the evolution of apomixis in ferns and in particular in the polystichoid ferns. Our findings indicate that apomixis evolved several times independently in three different clades of polystichoid ferns. A lineage-wide perspective across ferns indicates a correlation between apomixis and the species richness of lineages; however BiSSE tests did not recover evidence for a correlation of apomixis and diversification rates. Instead, evidence was recovered supporting an association between the establishment of apomixis and reticulate evolution, especially in the establishment of triploid hybrids. Diversification time estimates supported the hypothesis of short living apomictic lineages and indicated a link between the establishment of apomixis and the strengthening of the monsoons caused by the lifting of the Qinghai-Tibetan plateau. In general our results supported the hypothesis for the rare establishment of apomictic lineages, high extinction risks, and low speciation rates.

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Section: Methodsmentioning

confidence: 99%

The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

Dyer

Guo

et al. 2012

Journal of Botany

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“…It is considered to be a sexual diploid species because 64 spores were observed in each sporangium in several specimens. Kato et al (1992) reported 2n=156 (4x) with a sexual reproductive mode for the same species from the same locality. This species may have two cytotypes.…”

Section: H Obscurum Blumementioning

confidence: 97%

Cytotaxonomic study of genusHymenasplenium (Aspleniaceae) in Xishuangbanna, Southwestern China

Cheng

Murakami

1998

J. Plant Res.

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The gametic chromosome numbers of seven Hymenasplenium (Aspleniaceae) species from Xishuangbanna, Yunnan Prov., China, were investigated. All the examined individuals of H. obscurum, 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. apogamurn, 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.

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“…They are widespread in mainland China, Korea and Japan but never extend to the Himalayan region (Wu, 1979). It is evident that the Chinese group of species of Cyrtomium is biogeographically closely related to Japanese and Himalayan ones (Cheng, 1991;) Ching, 1976;Kato et al, 1992). Endemic element: The Southwest of China, which includes Southeast of Yunnan, Guizhou, Guangxi and Western Hunan, an area mostly of limestone mountains, has a number of species each having a restricted distribution range..…”

Section: Resultsmentioning

confidence: 99%

Pteridology in the New Millennium

Chandra¹,

Srivastava²

2003

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Cytotaxonomic study of ferns of Yunnan, southwestern China

Cited by 36 publications

References 12 publications

The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

Cytotaxonomic study of genusHymenasplenium (Aspleniaceae) in Xishuangbanna, Southwestern China

Pteridology in the New Millennium

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