Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
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Heterostyly and pollen dimorphism of Menyanthes trifoliata

  • Hye-Rin KIM (Department of Applied Plant Science, College of Agriculture and Life Sciences, Kangwon National University) ;
  • Kweon HEO (Department of Applied Plant Science, College of Agriculture and Life Sciences, Kangwon National University)
  • Received : 2022.10.27
  • Accepted : 2023.03.06
  • Published : 2023.03.31
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Abstract

Menyanthes trifoliata L., a heterostyly plant, is an endangered species in Korea. Floral morphology has been published for M. trifoliata, but few works have concentrated on pollen dimorphism differences accompanied by floral dimorphism. Here, we conducted a comparative morphological study of two morphs to investigate a dimorphism system with Korean populations. Pollen morphological characteristics were observed with a light microscope and a scanning electron microscope. For the pin type, pollen size is 36.01 ± 2.01 ㎛, whereas for the thrum type it is 41.28 ± 2.58 ㎛ in terms of the equatorial diameter. The two morphs have a small apocolpium field at 5.62 ± 0.30 for the pin type and 6.24 ± 0.70 for the thrum type. The configuration of the aperture was tricolpate with a striate ridge in the two morphs. However, they have different pollen shapes and sizes, stigma shapes, and apocolpium sizes. M. trifoliata only has different pollen sizes and shapes between European populations and Korean populations. Nevertheless, Korean populations also show pollen dimorphism correlated with their floral dimorphism.

Keywords

Acknowledgement

This study was supported by the Korean Research Foundation (KRF) with a grant to K. Heo for project number 2021R1I1A2043432.

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