Plant Diversity ›› 2011, Vol. 33 ›› Issue (3): 269-274.DOI: 10.3724/SP.J.1143.2011.10227

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Geographic Isolation between the Homoploid Hybrid Pinus densata and Its Parental Pinus yunnanensis

 LIU  Yong-Liang-1, MAO  Jian-Feng-2, WANG  Xiao-Ru-2, LI  Yue-1   

  1. 1 Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, National Engineering Laboratory of Forestry Breeding, Beijing Forestry University, Beijing 100083, China;
    2 State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
  • Received:2010-12-10 Online:2011-06-25 Published:2011-01-06


In order to elucidate the geographic isolation mechanisms between the homoploid hybrid Pinus densata and its parental Pinus yunnanensis in the Hengduan Mountains, we investigated the geographical distribution and flowering phenology of the populations of P.densata and P.yunnanensis by the actual route survey. The cluster analysis was based on seven meteorological factors. The resutls showed that P.densata and P.yunnanensis were distributed in different landscapes, and Zhongdian which located in Yunnan Province was the distribution critical region between the two species. P.densata was distributed northwardly along the Jinshajiang valley, and P.yunnanensis southwardly. The flowering phenology of P.yunnanensis was earlier than that of P.densata. The UPGMA clustering of the populations produced two clearly defined groups, almost all the P.densata populations forming one cluster and P.yunnanensis another. Because of the apophysis of the high mountains and altitude arising in geological history, P.densata and P.yunnanensis were separated geographically. The difference of meteorological factors in suitable regions for each species made their flowering phenology not meet, which blocked the gene flow between them, and formed the isolation.

Key words: Pinus densata, Pinus yunnanensis, Geographic distribution, Flowering phenology, Ecological divergence, Isolation

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