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Pollen-stigma interactions in Populus species reveal intraspecific variation and cross-compatibility. Irradiated pollen enhanced hybrid seedling production, suggesting mechanisms for gene flow restriction in poplars.

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Area of Science:

  • Plant reproductive biology
  • Genetics and genomics
  • Evolutionary botany

Background:

  • Understanding pollen-stigma interactions is crucial for plant breeding and conservation.
  • Populus species exhibit diverse reproductive strategies and potential for hybridization.
  • Mechanisms restricting gene flow between poplar species are not fully elucidated.

Purpose of the Study:

  • To investigate pollen-stigma interactions in intraspecific and intersectional crosses of Populus species.
  • To describe intraspecific variation in pollen hydration, size, and tube morphology.
  • To evaluate methods for enhancing interspecific hybridization in poplars.

Main Methods:

  • Scanning electron microscopy (SEM) was used to examine pollen-stigma interactions.
  • Intraspecific and intersectional crosses were performed within and between Populus sections LEUCE, AIGEIROS, and TACAMAHACA.
  • Treatments included irradiated mentor pollen, hexane, gibberellic acid, and naphthalene acetic acid.

Main Results:

  • Significant intraspecific variation was observed in pollen hydration, grain size, and tube morphology.
  • Pollen-tube behavior was largely consistent in conspecific and most intersectional crosses, except for P. tremuloides x P. trichocarpa.
  • Irradiated mentor pollen increased hybrid seedling production in interspecific crosses without altering incompatible pollen tube behavior.

Conclusions:

  • Pollen-stigma interactions exhibit species-specific and intraspecific variations in Populus.
  • Mechanisms of incongruity and gene flow restriction may operate at the pollen-stigma interface.
  • Irradiated mentor pollen offers a potential tool for overcoming reproductive barriers and increasing hybrid production in interspecific poplar crosses.