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Visualization of meiotic events in intact living anthers by means of two-photon microscopy
1Instituto Gulbenkian de Ciência, PT-2780-156, Oeiras, Portugal. jose.feijo@fc.ul.pt
Abstract:
In this paper we describe the application of two-photon microscopy (2 PM) to the study of meiosis in plants. Fresh, unfixed anthers of Agapanthus umbelatus were briefly incubated on a minimal medium containing the DNA fluorophore DAPI. DAPI incorporation took place in about 30 min and nuclei and other DNA-containing organelles kept their fluorescence for more than 24 h. Using PM it was possible to optically section the whole, unfixed anthers to a depth of approximately 200 microm. This was up to the mid sagital section and into the sporogenic tissue. Several meiotic figures were observed with unparalleled resolution. Sequences of nuclear dynamics and division were occasionally observed in the surrounding tissues and epidermal layer of cells. However we could not optimize the procedures up to the level of observing the dynamics of division on the meiotic nuclei as well. We hypothesize that either (1) meiotic cells are sensitive to the reasonably high excitation levels of infrared light needed to attain such penetration in the tissue, or (2) that our incubation procedures are not sufficiently non-invasive for meiosis to remain unperturbed. To the best of our knowledge this is the first report on direct observation of living meiotic cells in plants and establishes the potential of 2 PM for intact organ research.
Insights
This study demonstrates two-photon microscopy (2 PM) for observing living plant cells during meiosis. While visualizing meiotic figures, direct observation of meiotic division dynamics remains a challenge.
Area of Science:
- Plant biology
- Cell biology
- Microscopy
Background:
- Studying meiosis in plants typically requires fixed tissues, limiting dynamic observation.
- Advanced imaging techniques are needed to visualize live meiotic processes in intact plant organs.
Purpose of the Study:
- To apply two-photon microscopy (2 PM) for the direct observation of meiosis in intact, living plant anthers.
- To assess the feasibility of 2 PM for high-resolution imaging of meiotic figures in unfixed plant tissues.
Main Methods:
- Application of two-photon microscopy (2 PM) on fresh, unfixed Agapanthus umbelatus anthers.
- Brief incubation with DNA fluorophore DAPI for nuclear and organelle staining.
- Optical sectioning of anthers to a depth of approximately 200 micrometers.
Main Results:
- Successful visualization of meiotic figures with high resolution in unfixed plant anthers.
- DAPI fluorescence persisted for over 24 hours, enabling extended observation.
- Nuclear dynamics in surrounding tissues were observed, but not within meiotic nuclei.
Conclusions:
- Two-photon microscopy (2 PM) shows significant potential for intact organ research in plants.
- Challenges remain in observing meiotic division dynamics, possibly due to light sensitivity or incubation procedures.
- This study represents a novel approach to observing living meiotic cells in plants.