F-actin forms mobile and unwinding ring-shaped structures in germinating Arabidopsis pollen expressing Lifeact

Plant Signaling & Behavior
Frank Vogler, Stefanie Sprunck

Abstract

The flowering plant pollen tube is the fastest elongating plant cell and transports the sperm cells for double fertilization. The highly dynamic formation and reorganization of the actin cytoskeleton is essential for pollen germination and pollen tube growth. To drive pollen-specific expression of fluorescent marker proteins, commonly the strong Lat52 promoter is used. Here we show by quantitative fluorescent analysis that the gametophyte-specific ARO1 promoter from Arabidopsis drives an about 3.5 times weaker transgene expression than the Lat52 promoter. In one third of the pollen of F-actin-labeled ARO1p:tagRFP-T-Lifeact transgenic lines we observed mobile ring-shaped actin structures in pollen grains and pollen tubes. Pollen tube growth, transgene transmission and seed production were not affected by tagRFP-T-Lifeact expression. F-actin rings were able to integrate into emerging actin filaments and they may reflect a particular physiological state of the pollen or a readily available storage form provided for rapid actin network remodeling.

References

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Aug 1, 2014·Plant Reproduction·Frank VoglerStefanie Sprunck
Jan 27, 2015·Frontiers in Plant Science·Xiaolu QuShanjin Huang

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Citations

Jun 16, 2016·Plant, Cell & Environment·Uwe G HackeLenka Plavcová

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Methods Mentioned

BETA
transgenic
environmental stress

Software Mentioned

ImageJ
Lifeact

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