AI Article Synopsis
- Pollen grains have a resistant wall with apertures crucial for reproduction, and a notable shift from distal to proximal aperture locations in seed plants has occurred.
- The genus Tillandsia, part of the Bromeliaceae family, displays a unique aperture pattern previously thought to be distal, but this study reveals it to be proximal instead.
- The findings show that the sulcate aperture in Tillandsia leiboldiana is functional, marking the first report of proximal germination and highlighting distinct features in postmeiotic tetrads.
Article Abstract
Pollen grains are generally surrounded by an extremely resistant wall interrupted in places by apertures that play a key role in reproduction; pollen tube growth is initiated at these sites. The shift from a proximal to distal aperture location is a striking innovation in seed plant reproduction. Reversals to proximal aperture position have only very rarely been described in angiosperms. The genus Tillandsia belongs to the Bromeliaceae family, and its aperture pattern has been described as distal monosulcate, the most widespread aperture patterns recorded in monocots and basal angiosperms. Here we report developmental and functional elements to demonstrate that the sulcate aperture in Tillandsia leiboldiana is not distal as previously described but proximal. Postmeitotic tetrad observation indicates unambiguously the proximal position of the sulcus, and in vitro germination of pollen grains confirms that the aperture is functional. This is the first report of a sulcate proximal aperture with proximal germination. The observation of microsporogenesis reveals specific features in the patterns of callose thickenings in postmeiotic tetrads.
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| http://dx.doi.org/10.3732/ajb.0900264 | DOI Listing |
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