Plant Diversity ›› 2007, Vol. 29 ›› Issue (02): 198-200.

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Karyomorphology and Taxonomic Position of Poncirus polyandra (Rutaceae)

LIU Li-Qin1 , 2 , YANG Jing1 , 2 , GU Zhi-Jian   

  1. 1 Kunming Institute of Botany , Chinese Academic of Sciences , Kunming 650204 , China ;
    2 Graduate University of Chinese Academy of Sciences, Beijing 100039 , China
  • Received:2006-05-17 Online:2007-04-25 Published:2007-04-25
  • Contact: GU Zhi-Jian

Abstract: A study on Poncirus polyandra was conducted karyologically . The interphase nuclei was observed to be the round prochromosome type , and the prophase chromosome type was the interstitial type . The karyotype of metaphase chromosome in somatic cells is: 2n = 2x = 18 = 12m+ 6sm (2SAT ) . The karyotype belonged to Stebbins′1A type . The karyotypes among P. polyandra , P. trifoliata and Citurus sinensis were compared . Based on the evidence from cytology , palynology , morphology , leaf isozymes and molecular systematics, the systematic position of P . polyandry was discussed . It is more reasonable to place P . polyandra in the genus Poncirus, and it probably represents a more primary species in the genus .

Key words: Poncirus polyandra