Sporogenesis and Gametogenesis of Polygonatum cyrtonema

doi:10.7525/j.issn.1673-5102.2025.02.007

Abstract

Abstract:

The floral bud development of Polygonatum cyrtonema was examined at various stages using paraffin sectioning techniques， the characteristics of megasporogenesis and microsporogenesis and the development process of male and female gametophytes were explored respectively， the fundamental data for the genetic improvement and breeding of P. cyrtonema was provided.The results showed that：（1）The anther wall was composed of epidermis， endothecium， middle layer and tapetum layer. The tapetum layer was secretory， with mature tapetal cells exhibiting binucleate or multinucleate structures. The mature endothecium displayed fibrous thickened. （2）During the meiosis of microspore mother cell， cytokinesis occurred through a continuous type， resulting in tetrads arranged symmetrically in a linear pattern. Most mature pollen grains were two-cell type， occasionally three-cell type. （3）Meiosis of the megaspore mother cell produced a linear tetrad， and the development of the embryo sac followed the Polygonum type. The reproductive cellular development in P. cyrtonema demonstrated similarities to other members of the Polygonatum genus. Notably， the presence of a secretory tapetum and the three-celled pollen grain suggests that P. cyrtonema might have a relatively advanced evolutionary status.

Key words: Polygonatum cyrtonema, megasporogenesis and microsporogenesis, male and female gametophytes

CLC Number:

Q944

Qi ZHANG, Jiayin LI, Haiyan WANG, Ziqin MA, Fu HE. Sporogenesis and Gametogenesis of Polygonatum cyrtonema[J]. Bulletin of Botanical Research, 2025, 45(2): 211-216.

Figures/Tables 3

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