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

doi:10.7677/ynzwyj201413215

Abstract

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

ZHU Jun-Yi, ZHANG Li-Fan, SHEN Peng, REN Bao-Qing, LIANG Yu, CHEN Zhi-Duan . The Morphogenesis of Inflorescence and Flower in Corylus (Betulaceae)*[J]. Plant Diversity, 2014, 36(04): 433-442.

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