Plant Diversity ›› 2014, Vol. 36 ›› Issue (04): 433-442.doi: 10.7677/ynzwyj201413215

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The Morphogenesis of Inflorescence and Flower in Corylus (Betulaceae)*

 ZHU  Jun-Yi-1, ZHANG  Li-Fan-1, SHEN  Peng-1, REN  Bao-Qing-3, LIANG  Yu-1, CHEN  Zhi-Duan-2   

  1. 1 School of Life Sciences, Tonghua Normal University, Tonghua 134002, China; 2 State Key Laboratory of Systematic
    and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
    3 Shanxi Taishan Botanical Garden, Taiyuan 030025, China
  • Received:2013-10-23 Online:2014-07-25 Published:2013-12-20
  • Supported by:

    国家自然基金项目 (31170180, 31270268) 和国家重大科学研究计划项目 (2014CB954100)

Abstract:

The morphogenesis of inflorescence and flowers of Corylus was observed using scanning electron microscope for the first time. The female inflorescence of Corylus was composed of multiple cymules arranged in a spiral configuration. Each cymule primordium differentiated one primary bract and one cluster of cymule primordium meristem; two flower primordia were differentiated from the crmule meristem. Each flower primordium differentiated two carpellary primordia, forming a bicarpellary pistil. Each flower has two layer perianth at the base of pistil. The inner perianth primordium was in circular configuration, and outer perianth initiated unevenly from the adaxial and abaxial of the floral primordium. The initiation of the outer perianth was earlier than the inner. The male inflorescences were catkinlike and composed of multiple cymules arranged in a spiral configuration. Each cymule primordium differentiated one primary bract and one cluster of cymule primordium meristem. Two secondary bracts and four to six stamens were differentiated from each cymule primordium meristem. Each stamen has four anther sacs. In the process of the stamen differentiated into four anther sacs, the stamen primordium began longitudinal fissure, and the filament divided totally into the base. The results provide micromorphological evidence for the generic level identification and phylogeny of Betulaceae.

Key words: Corylus, Floral organs, Morphogenesis

CLC Number: 

  • Q 944