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Effect of symplasmic isolation and antigibberellin treatment on morphogenesis in Chara
1Department of Cytophysiology, University of Lódź, Poland.
Abstract:
The effects of plasmolytically induced symplasmic isolation and AMO-1618 treatment on the development of antheridia of Chara vulgaris L. were compared. After 24 h both factors inhibited endoreplication in manubria. In the youngest antheridia the inhibition of 3H-thymidine incorporation following plasmolysis was irreversible while the same effect caused by AMO-1618 disappeared after 3 days. Four-five days after plasmolysis or five days after AMO-1618 treatment antheridia which were at the stage of spermiogenesis had a lower level of DNA in manubria and revealed decreased productivity due to the smaller number of mitotic divisions in antheridial filaments. On the basis of the previous and present data a hypothesis was put forward that in both experiments premature spermiogenesis was caused by a rapid decrease in gibberellin level in the antheridia.
Insights
Plasmolysis and AMO-1618 treatment inhibit DNA replication in Chara vulgaris antheridia, leading to premature spermiogenesis. This suggests a rapid decrease in gibberellin levels may cause these developmental changes.
Area of Science:
- Plant reproductive biology
- Charophyte algae development
- Molecular plant physiology
Background:
- Antheridia development in Characeae is crucial for sexual reproduction.
- Endoreplication and mitotic divisions are key processes in antheridial development.
- Plant growth regulators like gibberellins influence reproductive development.
Purpose of the Study:
- To compare the effects of symplasmic isolation and AMO-1618 on antheridia development in Chara vulgaris.
- To investigate the impact of these treatments on DNA replication and cell division.
- To explore the potential role of gibberellins in regulating antheridial development.
Main Methods:
- Induction of symplasmic isolation via plasmolysis.
- Treatment with AMO-1618, a growth inhibitor.
- Assessment of 3H-thymidine incorporation to measure DNA synthesis.
- Microscopic analysis of antheridial development stages and cell division rates.
Main Results:
- Both plasmolysis and AMO-1618 inhibited endoreplication in manubria within 24 hours.
- Plasmolysis caused irreversible inhibition of DNA synthesis in young antheridia, while AMO-1618's effect was reversible.
- Treatments led to lower DNA levels and reduced productivity in spermiogenesis-stage antheridia due to decreased mitotic activity.
Conclusions:
- Premature spermiogenesis in Chara vulgaris antheridia may be triggered by a rapid decline in gibberellin levels.
- Symplasmic isolation and AMO-1618 treatments provide insights into the hormonal regulation of antheridial development.
- Further research is needed to confirm the direct role of gibberellins in this process.