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Characterization of thylakoid division using chloroplast dividing mutants in Arabidopsis

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Abstract

Chloroplasts are double membrane bound organelles that are found in plants and algae. Their division requires a number of proteins to assemble into rings along the center of the organelle and to constrict in synchrony. Chloroplasts possess a third membrane system, the thylakoids, which house the majority of proteins responsible for the light-dependent reactions. The mechanism that allows chloroplasts to sort out and separate the intricate thylakoid membrane structures during organelle division remain unknown. By characterizing the sizes of thylakoids found in a number of different chloroplast division mutants in Arabidopsis, we show that thylakoids do not divide independently of the chloroplast division cycle. More specifically, we show that thylakoid division requires the formation of both the inner and the outer contractile rings of the chloroplast.

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Acknowledgements

We would like to thank Dr. Katherine W. Osteryoung for providing us with arc6, pdv1-1, pdv1-2, pdv2-1, and pdv2-2 Arabidopsis seeds, Drs. Bo Liu and Yuh-Ru Julie Lee for providing access to their phase contrast microscope and for sharing their expertise in confocal microscopy. We would also like to thank Drs. Lan-Xin Shi and Li Liu for their expertise in plant tissue culture. This work was funded by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the US Department of Energy through Grant DE-FG02-03ER15405.

Funding

This work was funded by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the US Department of Energy through Grant DE-FG02-03ER15405.

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JH and SMT: designed experiments. JH, WK and VL: performed the experiments and all authors analyzed the data. JH and SMT: wrote the article and all authors approved it.

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Correspondence to Steven M. Theg.

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Ho, J., Kwan, W., Li, V. et al. Characterization of thylakoid division using chloroplast dividing mutants in Arabidopsis. Photosynth Res 157, 1–11 (2023). https://doi.org/10.1007/s11120-023-01002-4

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  • DOI: https://doi.org/10.1007/s11120-023-01002-4

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