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Morphological Type Identification of Self-Incompatibility in

Shan-Ce Niu1,2,3, Jie Huang4, Qing Xu5

  • 1Shenzhen Key Laboratory for Orchid Conservation and Utilization, The National Orchid Conservation Center of China and The Orchid Conservation and Research Center of Shenzhen, Shenzhen 518114, China. niushance@163.com.

International Journal of Molecular Sciences
|September 12, 2018
PubMed
Summary

Self-incompatibility (SI) in Dendrobium orchids is more diverse than expected, with many recently evolved SI determinants. This diversity likely drives the high speciation observed in this large orchid genus.

Keywords:
Dendrobiumancestral statuscapsule setpollen tubeself-incompatibility

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Area of Science:

  • Plant reproductive biology
  • Evolutionary botany
  • Orchidaceae genomics

Background:

  • Self-incompatibility (SI) is crucial for angiosperm diversity, yet only 10% of orchids exhibit SI.
  • Dendrobium, a major orchid genus, shows a high SI prevalence (72%), suggesting its role in orchid speciation.
  • Limited research exists on SI mechanisms within the Dendrobium genus.

Purpose of the Study:

  • To investigate the diversity and phylogenetic distribution of self-incompatibility (SI) phenotypes in Dendrobium.
  • To understand the evolutionary patterns of SI within the Dendrobium genus.
  • To elucidate the contribution of SI to the diversification of Dendrobium orchids.

Main Methods:

  • Phenotypic analysis of SI through controlled pollination experiments.
  • Assessment of flowering time, capsule set rates, and pollen tube growth in representative Dendrobium species.
  • Phylogenetic analysis of SI phenotype distribution within the Asian Dendrobium clade.

Main Results:

  • The study revealed a greater diversity of SI phenotypes in Dendrobium than previously anticipated.
  • Dendrobium chrysanthum exhibited the predominant SI type among the investigated species.
  • SI determinants in Dendrobium appear to be numerous, recently evolved, and potentially orchid-specific.

Conclusions:

  • Self-incompatibility plays a significant role in the evolutionary diversification of the Dendrobium genus.
  • The high diversity of SI phenotypes suggests recent and rapid evolution of reproductive barriers.
  • Further research into specific SI determinants is warranted to understand orchid evolution.