Plant Diversity ›› 2014, Vol. 36 ›› Issue (06): 737-746.doi: 10.7677/ynzwyj201414018

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Tracing the Origin of the Bimodal Karyotypes of the Tribe Lilieae (Liliaceae) Based on Comparative Karyotype Analyses

 YIN  Gen-Shen-1、2, YANG  Zhi-Yun-1, CHIANG  Tzen-Yuh-3, GONG  Xun-1   

  1. 1 Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 Department of Life Sciences, National ChengKung University, Tainan 701, Taiwan, China
  • Received:2014-02-12 Online:2014-11-25 Published:2014-04-09
  • Supported by:

    The National Natural Science Foundation of China (31170633)

Abstract:

The karyotypes of the tribe Lilieae are rather constant bimodal, which is composed of 4 longer and 20 shorter chromosomes. However,it remains unclear which mechanisms (centric fission or polyploidisation) might contribute to the origin of biomodality in this tribe. Here, we collected the published data for all genera of the Li-lioideae and Medeoloideae, and re-analyzed the karyotype data. The evidence of individual chromosome features, fundamental number (FN), karyotype asymmetry and chromosome relative length indicated that centric fission is the main mechanism underlying karyotypic evolution in the Lilieae. However, centric fission is not expected to occur in isolation, and different mechanisms of karyotype change, such as pericentric inversion and segment translocation, are not mutually exclusive. Pericentric inversion and segment translocation may have played major roles in the karyotype evolution of the Tulipeae. Additionally, the karyotype analyses are carried out for the first time in three taxa: Fritillaria crassicaulis, Tulipa suaveolens, and Gagea oxycarpa.

Key words: Bimodal karyotype, Centric fission, Comparative karyotype analysis, Karyotype evolution, Lilieae

CLC Number: 

  • Q 941