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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (11): 2417-2434.doi: 10.16420/j.issn.0513-353x.2022-0969

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Morphological Characteristics of Pollen from 44 Species of Subgen. Yulania

WANG Xiaobo1,2, CAO Ying2,3, GUO Wei1,2, MA Lin1,2, LIU Xiuli1,2,*()   

  1. 1 School of Landscape Architecture,Beijing Forestry University,Beijing 100083,China
    2 Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding,National Engineering Research Center for Floriculture,Beijing Laboratory of Urban and Rural Ecological Environment,Beijing 100083,China
    3 Beijing Botanical Garden,Beijing Floriculture Engineering Technology Research Centre,Beijing 100093,China
  • Received:2023-01-21 Revised:2023-07-14 Online:2023-11-25 Published:2023-11-28
  • Contact: LIU Xiuli

Abstract:

In order to clarify the morphological characteristics of the pollen and taxonomic relationships of the Subgen. Yulania,the present study observed the morphological characteristics of pollen of 44 Subgen. Yulania(including 8 accessions,36 cultivars)using scanning electron microscopy(SEM). Pollen of all tested materials is single-grained with one grooves and belong to N1P3C3-type pollen grains,prolate or perprolate,with size medium(36.06-42.81)μm ×(16.39-20.07)μm and symmetrical from left to right. Pollen is subglobose in polar view,oval or long oval in equatorial view,and boat-shaped in lateral view. The extine pattern of pollen is relatively primitive and could be broadly divided into six types:hole-shaped,verrucate shaped,stripe-shaped,brain-shaped,short rod-shaped hole shaped and tuberculate. The results showed that the pollen shape and colpae of different Subgen. Yulania were similar,but the exine varied greatly. Therefore,pollen morphology can be used to distinguish different species. However,due to its low resolution,it is difficult to distinguish Yulania species accurately,and it can only be used as an auxiliary reference index for species classification.

Key words: Subgen. Yulania, pollen morphology, scanning electron microscope, cluster analysis