The host actin cytoskeleton channels rhizobia release and facilitates symbiosome accommodation during nodulation in Medicago truncatula

The New Phytologist
Xiaxia ZhangZhaosheng Kong

Abstract

In plants, the actin cytoskeleton plays a central role in regulating intracellular transport and trafficking in the endomembrane system. Work in legumes suggested that during nodulation, the actin cytoskeleton coordinates numerous cellular processes in the development of nitrogen-fixing nodules. However, we lacked live-cell visualizations demonstrating dynamic remodeling of the actin cytoskeleton during infection droplet release and symbiosome development. Here, we generated transgenic Medicago truncatula lines stably expressing the fluorescent actin marker ABD2-GFP, and utilized live-cell imaging to reveal the architecture and dynamics of the actin cytoskeleton during nodule development. Live-cell observations showed that different zones in nitrogen-fixing nodules exhibit distinct actin architectures and infected cells display five characteristic actin architectures during nodule development. Live-cell imaging combined with three-dimensional reconstruction demonstrated that dense filamentous-actin (F-actin) arrays channel the elongation of infection threads and the release of infection droplets, an F-actin network encircles freshly-released rhizobia, and short F-actin fragments and actin dots around radially distributed symbio...Continue Reading

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Citations

Dec 21, 2018·The New Phytologist·Andrea Genre, Ton Timmers
Jun 10, 2020·Nature Plants·Qi WangZhaosheng Kong
Jun 4, 2019·Communicative & Integrative Biology·Nigel ChaffeyFrantišek Baluška
Mar 19, 2020·International Journal of Molecular Sciences·Yolanda Ortega-OrtegaCarmen Quinto
Mar 3, 2020·Frontiers in Plant Science·Louise de BangElison B Blancaflor

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