Abstract
Fluorescence labeling of F-actin in pollen tubes by various methods has produced inconsistent results in the literature. Here, we report that EGTA, which was always used in fixative buffers in the past and thought to help cytoskeleton stabilization, can significantly affect F-actin distribution and lead to the formation of thick F-actin bundles at the tip of the pollen tube. We also found that vacuum-infiltration for the first 5 min during pollen tube fixation can better preserve normal cytoplasm structure and F-actin distribution. In contrast, m-maleimidobenzoic acid N-hydroxysuccinimide ester (MBS) treatment before chemical fixation resulted in a shortening of the free zone of thick F-actin bundles in the pollen tube tip. Taken together, our results suggest that exclusion of EGTA and MBS from the fixative buffer, in combination with vacuum-infiltration in the first 5 min of fixation, can improve F-actin fluorescence labeling in pollen tubes of Lilium davidii.
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Abbreviations
- FM:
-
Fixative method;
- GFP:
-
Green fluorescent protein;
- MBS:
-
m-Maleimidobenzoic acid N-hydroxysuccinimide ester
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Acknowledgements
We thank Ms. Shi-Wen Li for her help with the confocal microscope and the second reviewer for helpful comments. This study was supported by the National Natural Science Foundation of China (No. 30470109 and 30170458) to Yan Li
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Communicated by H. Wang
Li Wang and Yi-Min Liu are considered joint first authors
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Wang, L., Liu, YM. & Li, Y. Comparison of F-actin fluorescent labeling methods in pollen tubes of Lilium davidii. Plant Cell Rep 24, 266–270 (2005). https://doi.org/10.1007/s00299-005-0935-y
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DOI: https://doi.org/10.1007/s00299-005-0935-y