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A whole-cell electron tomography model of vacuole biogenesis in Arabidopsis root cells
Abstract
Plant vacuoles are dynamic organelles that play essential roles in regulating growth and development. Two distinct models of vacuole biogenesis have been proposed: separate vacuoles are formed by the fusion of endosomes, or the single interconnected vacuole is derived from the endoplasmic reticulum. These two models are based on studies of two-dimensional (2D) transmission electron microscopy and 3D confocal imaging, respectively. Here, we performed 3D electron tomography at nanometre resolution to illustrate vacuole biogenesis in Arabidopsis root cells. The whole-cell electron tomography analysis first identified unique small vacuoles (SVs; 400-1,000 nm in diameter) as nascent vacuoles in early developmental cortical cells. These SVs contained intraluminal vesicles and were mainly derived/matured from multivesicular body (MVB) fusion. The whole-cell vacuole models and statistical analysis on wild-type root cells of different vacuole developmental stages demonstrated that central vacuoles were derived from MVB-to-SV transition and subsequent fusions of SVs. Further electron tomography analysis on mutants defective in MVB formation/maturation or vacuole fusion demonstrated that central vacuole formation required functional MVBs and membrane fusion machineries.
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Plant cell-specific structures called provacuoles have a striking similarity to a phagophore but form in an autophagy-independent manner.
“Plant cell-specific structures called provacuoles have a striking similarity to a phagophore, but form in an autophagy-independent manner [62].”
From Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition) 1 (2021) · cites this paper as [62]
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Cited by
Sorted by citations
Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition) 1
Klionsky, D. J., Abdel-Aziz, A. K., Abdelfatah, S., Abdellatif, M., Abdoli, A., Abel, S., Abeliovich, H., Abildgaard, M. H., Abudu, Y. P., Acevedo-Arozena, A., et al. (2021) · Autophagy · doi:10.1080/15548627.2020.1797280 · Cited by 2,897
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Metadata
- Authors
- Cui, Y., Cao, W., He, Y., Zhao, Q., Wakazaki, M., Zhuang, X., Gao, J., Zeng, Y., Gao, C., Ding, Y., Wong, H. Y., Wong, W. S., Lam, H. K., Wang, P., Ueda, T., Rojas-Pierce, M., Toyooka, K., Kang, B.-H., & Jiang, L.
- Venue
- Nature Plants
- Published
- 2018-12-17
- Volume
- 5
- Issue
- 1
- Pages
- 95-105
- ISSN
- 2055-0278
- Cited by
- 166
- References
- 0
- Language
- en
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