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Who determines the timing of inflorescence closure of a sexual dandelion? Pollen donors versus recipients

  • Daisuke KyogokuEmail author
  • Yutaro Kataoka
  • Michio Kondoh
Original Paper

Abstract

Male–male competition for mating or fertilization opportunities may in theory select for male manipulative adaptation that can harm males’ mates, leading to sexual conflict. Evolutionary theory predicts that selection will favor the manipulation by pollen of the duration of its recipients’ receptivity. However, there is insufficient evidence to show that pollen can exert effects on the duration of receptivity, a prerequisite for the evolution of pollen manipulative adaptation. Using a sexual diploid dandelion, Taraxacum japonicum, we conducted hand pollination experiments within and between populations to examine the effects of pollen on the timing of inflorescence (flower head) closure. We also examined the potential fitness consequences to the pollen recipients by field observation of seed production in populations with different inflorescence closure timing. Within-population experiments showed that pollination induced inflorescence closure even when some of the florets in the inflorescence were not yet pollinated with compatible pollen. Furthermore, between-population crosses revealed that pollen donors, recipients, and their interaction all influenced the timing of inflorescence closure. Different populations differed in the timing of inflorescence closure, which could affect the availability to the recipients of pollen for fertilization and thereby seed production. However, there were no significant differences in the rates of natural seed production in these populations. Our results demonstrate that pollen donors, as well as recipients, contribute to the duration of floral receptivity. We discuss the implications of our findings to the evolutionary theory of plant reproduction.

Keywords

Dandelion Pollen competition Sexual conflict Sexual selection Taraxacum 

Notes

Acknowledgements

We are grateful to Yutaka Osada for statistical advice, Kenji Suetsugu for discussion and Sanako Matsumoto for the assistance in collecting plants. This study was supported by the Research Fellowship for Young Scientists from JSPS (16J03061) to D.K.

Author contributions

DK conceived the study, YK and DK performed the experiments and survey, and all authors contributed to write the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10682_2019_10000_MOESM1_ESM.docx (99 kb)
Supplementary file1 (DOCX 98 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Science and TechnologyRyukoku UniversityOhtsuJapan
  2. 2.Ecological Integration, Graduate School of Life SciencesTohoku UniversitySendaiJapan
  3. 3.Research Institute for Food and AgricultureRyukoku UniversityOtsuJapan

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