Karyomorphology of the endangered Trigonobalanus doichangensis (A. Camus) Forman (Fagaceae) and its taxonomic and biogeographical implications |
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Authors: | GAO CHEN WEI-BANG SUN CHUN-YAN HAN ALLEN COOMBES |
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Institution: | Kunming Botanical Garden, Kunming Institute of Botany, The Chinese Academy of Sciences, Kunming 650204, Yunnan, China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, China; Nanjing Forestry University, Nanjing 210037, China; Sir Harold Hillier Gardens, Jermyns Lane, Ampfield, Romsey, Hampshire, SO51 0QA, UK |
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Abstract: | Cytological studies were carried out for the first time on five populations of Trigonobalanus doichangensis in China and Thailand. In all populations, the pattern of interphase nuclei was of the simple chromocentre type, the mitotic prophases were of the proximal interstitial type and chromosome numbers were 2 n = 2 x = 14. Two B chromosomes were commonly observed at prophase and prophase–metaphase, but rarely at metaphase. Karyotype variation among the populations at the diploid level was limited, but there were some distinguishing cytological characters. Based on the comparison of all the available data on cytology, taxonomy, phytogeography and molecular systematics related to the genus Trigonobalanus , we recommend that the three species of Trigonobalanus comprise the subfamily Trigonobalanoideae and that the genus should not be segregated into three monotypic genera. © 2007 The Linnean Society of London, Botanical Journal of the Linnean Society , 2007, 154 , 321–330. |
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Keywords: | B chromosomes China cytotaxonomy Trigonobalanoideae |
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