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Visualizing Bacteria in Nematodes using Fluorescent Microscopy
Published on: October 19, 2012
Analysis of Nuclear Dynamics in Nematode-Trapping Fungi Based on Fluorescent Protein Labeling
Liang Zhou1,2, Zhiwei He1,2, Keqin Zhang1,2
1State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming 650500, China.
Abstract:
Nematophagous fungi constitute a category of fungi that exhibit parasitic behavior by capturing, colonizing, and poisoning nematodes, which are critical factors in controlling nematode populations in nature, and provide important research materials for biological control. Arthrobotrys oligospora serves as a model strain among nematophagous fungi, which begins its life as conidia, and then its hyphae produce traps to capture nematodes, completing its lifestyle switch from saprophytic to parasitic. There have been many descriptions of the morphological characteristics of A. oligospora lifestyle changes, but there have been no reports on the nuclear dynamics in this species. In this work, we constructed A. oligospora strains labeled with histone H2B-EGFP and observed the nuclear dynamics from conidia germination and hyphal extension to trap formation. We conducted real-time imaging observations on live cells of germinating and extending hyphae and found that the nucleus was located near the tip. It is interesting that the migration rate of this type of cell nucleus is very fast, and we speculate that this may be related to the morphological changes involved in the transformation to a predatory lifestyle. We suggest that alterations in nuclear shape and fixation imply the immediate disruption of the interaction with cytoskeletal mechanisms during nuclear migration. In conclusion, these findings suggest that the signal initiating nuclear migration into fungal traps is generated at the onset of nucleus entry into a trap cell. Our work provides a reference for analysis of the dynamics of nucleus distribution and a means to visualize protein localization and interactions in A. oligospora.
Insights
Nematophagous fungi like Arthrobotrys oligospora switch to a predatory lifestyle by forming traps. This study visualizes nuclear dynamics during this transition, revealing rapid nuclear migration potentially linked to lifestyle changes.
Area of Science:
- Mycology
- Cell Biology
- Biological Control
Background:
- Nematophagous fungi parasitize nematodes, playing a key role in biological control.
- Arthrobotrys oligospora is a model organism for studying the transition from saprophytic to parasitic lifestyles.
- Nuclear dynamics during the lifestyle switch in A. oligospora remain largely uncharacterized.
Purpose of the Study:
- To investigate and visualize nuclear dynamics during the parasitic lifestyle transition in Arthrobotrys oligospora.
- To understand the relationship between nuclear migration and the formation of nematode-trapping structures.
Main Methods:
- Construction of Arthrobotrys oligospora strains labeled with histone H2B-EGFP for nuclear visualization.
- Real-time live-cell imaging of conidia germination, hyphal extension, and trap formation.
- Observation and analysis of nuclear positioning and migration dynamics.
Main Results:
- The nucleus in A. oligospora was observed to be located near the hyphal tip during germination and extension.
- A rapid nuclear migration rate was detected, potentially associated with the morphological changes for predation.
- Alterations in nuclear shape and fixation suggest disruption of cytoskeletal interactions during migration.
Conclusions:
- Nuclear migration into fungal traps is initiated upon entry into the trap cell.
- The findings provide insights into nuclear dynamics and protein localization in A. oligospora.
- This study offers a foundation for further analysis of nuclear distribution in nematophagous fungi.
