STUDIES ON THE KARYOTYPES OF THREE SPECIES AND THE CYTOTAXONOMY OF THUJOIDEAE (DUPRESSACEAE)

Abstract

Abstract: The present paper deals with the karyotype analyses of Thup Plicata, T. occidentalis and Calocedrus decurrens. The karyotype formulas of the species are K(2n)= 22= 16m +6sm(2SAT), 20m(2SAT)+2sm and 20m(2SAT)+2sm respectively. The karyotype of T.plicata is reported for the first time. The comparison among the karyotypes of 10 genera in Thujoideae (Ta- ble 2, Fig.2) shows that the genera in the Southern Hemisphere (including Callitris, Aclinostrobus, Libocedrus, Microbiota and Widdringtonia) and Tetraclinis and Platycladus in the Northern Hemi- sphere may be the most primitive, Thuppsis and Thup the most advanced, and Calocedrus inter- mediate. The paper also discusses the classificatory positions of Calocedrus, Platycladus and the southern genera.

Key words: Karyotype

LI Lin-Chu, LIU Yong-Qiang, WANG Yu-Qin, LIU Gang. STUDIES ON THE KARYOTYPES OF THREE SPECIES AND THE CYTOTAXONOMY OF THUJOIDEAE (DUPRESSACEAE)[J]. Plant Diversity, 1996, 18(04): 1-3.

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STUDIES ON THE KARYOTYPES OF THREE SPECIES AND THE CYTOTAXONOMY OF THUJOIDEAE (DUPRESSACEAE)

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