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《Acta Phytotaxonomica Sinica》 1994-03
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KARYOTYPES OF DISANTHUS AND MYTILARIA (HAMAMELIDACEAE)

Pan Kai-yu Yang Qin-er (Laboratory of Systematic and Evolutionary Botany, and Herbarium, Institute of Botany, Chinese Academy of Sciences , Beijing 100093)  
Reported in the present paper are chromosome numbers and karyotypes of two monospecific genera, Disanthus Maxim, and Mytilaria Lee. in the Hamamelidaceae. Disan-thus cercidifoltus subsp. longipes (H. T. Chang) K. Y. Pan, distributed in China, was found to have the same chromosome number as the subsp. cercidifolius in Japan, i. e. 2n = 16, with x = 8. The interphase nuclei were of the simple-complex chromocenter type, and the mitotic prophase chromosomes were of the proximal type. Remarkable differences in karyotype were found between the two subspecies; the former with 2n = 2x = 16=6m + 10 sm, while the latter with 2n = 2x=16 = 6m + 6sm + 4st (t). The absence of st ( or t) chromosomes in subsp. longipes, together with gross-morphological evidence, suggest that this subspecies be more primitive than the other. Mytilaria laosensis Lee. was found to have interphase nuclei of the simple-complex type, and mitotic prophase chromosomes of the proximal type. The chromosome number was 2n = 26 with x=13 and the karyotype was 2n = 2x= 26= 22m +4sm (1SAT). This is the first chromosome report for this genus. The basic chromosome number, x = 13, might be a new one for the whole Hamamelidaceae. The present authors support the treatment of Mytilaria as an independent subfamily, Myti-larioideae, considering its morphological characters and relationships with the genus Exbuck-landia.
【Fund】: 中国科学院生物分类区系地理学特别支持费资助项目
【CateGory Index】: Q943
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