Anatomical features of pollinia and caudicle in Epidendrum (Orchidaceae; Epidendroideae)

Alves, Mariana Ferreira; Pinheiro, Fabio; De Toni, Karen Lúcia Gama; Baumgratz, José Fernando Andrade

doi:10.1007/s40415-023-00963-z

Braz. J. Bot

2023

DOI: 10.1007/s40415-023-00963-z

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Anatomical features of pollinia and caudicle in Epidendrum (Orchidaceae; Epidendroideae)

Mariana Ferreira Alves,

Fabio Pinheiro,

Karen Lúcia Gama De Toni

et al.

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2024

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Permeability of postzygotic barriers: embryology of a partially fertile Epidendrum (Orchidaceae) hybrid

Alves,

Pinheiro,

da Silva Graciano

et al. 2024

Plant Biol J

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Hybrid zones offer unique insight into reproductive barriers and plant speciation mechanisms. This study investigated postzygotic reproductive isolation in the natural hybrid Epidendrum × purpureum, which occurs in sympatry with its parent species, Epidendrum denticulatum and E. orchidiflorum. We examined the development of male and female gametophytes and the events leading to seed formation in this hybrid zone. Floral buds and flowers from E. × purpureum individuals were collected at various stages of development. Both self‐pollination and backcrosses between hybrids and parental species were performed to follow ovule and seed development up to 60 days after pollination. The material was analysed using optical and confocal microscopy. In most hybrids, microsporogenesis and microgametogenesis occur regularly, forming viable male gametophytes. Non‐viable male gametophytes were also observed and are the result of symmetrical mitotic division. The development of the female gametophyte occurs after self‐pollination, and proceeds regularly, resulting in a reduced female gametophyte. Embryo development in the parental species occurs without abnormalities, while in backcrosses between hybrids and parental species, most embryos degenerate. Embryo degeneration in the crosses between hybrids can be explained by genetic incompatibilities. The co‐occurrence of viable embryos and degenerating embryos in backcrosses between hybrids and parental species point to incomplete postzygotic reproductive barriers between the hybrid and the progenitors. Our findings suggest that E. × purpureum could facilitate gene flow between parental species, as much of its embryological development occurs without abnormalities.

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Permeability of postzygotic barriers: embryology of a partially fertile Epidendrum (Orchidaceae) hybrid

Alves,

Pinheiro,

da Silva Graciano

et al. 2024

Plant Biol J

View full text Add to dashboard Cite

show abstract

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Anatomical features of pollinia and caudicle in Epidendrum (Orchidaceae; Epidendroideae)

Cited by 1 publication

References 38 publications

Permeability of postzygotic barriers: embryology of a partially fertile Epidendrum (Orchidaceae) hybrid

Permeability of postzygotic barriers: embryology of a partially fertile Epidendrum (Orchidaceae) hybrid

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