A nodule-specific lipid transfer protein AsE246 participates in transport of plant-synthesized lipids to symbiosome membrane and is essential for nodule organogenesis in Chinese milk vetch

Plant Physiology
Lei LeiYou-Guo Li

Abstract

Rhizobia in legume root nodules fix nitrogen in symbiosomes, organelle-like structures in which a membrane from the host plant surrounds the symbiotic bacteria. However, the components that transport plant-synthesized lipids to the symbiosome membrane remain unknown. This study identified and functionally characterized the Chinese milk vetch (Astragalus sinicus) lipid transfer protein AsE246, which is specifically expressed in nodules. It was found that AsE246 can bind lipids in vitro. More importantly, AsE246 can bind the plant-synthesized membrane lipid digalactosyldiacylglycerol in vivo. Immunofluorescence and immunoelectron microscopy showed that AsE246 and digalactosyldiacylglycerol localize in the symbiosome membrane and are present in infection threads. Overexpression of AsE246 resulted in increased nodule numbers; knockdown of AsE246 resulted in reduced nodule numbers, decreased lipids contents in nodules, diminished nitrogen fixation activity, and abnormal development of symbiosomes. AsE246 knockdown also resulted in fewer infection threads, nodule primordia, and nodules, while AsE246 overexpression resulted in more infection threads and nodule primordia, suggesting that AsE246 affects nodule organogenesis associated w...Continue Reading

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Citations

Sep 22, 2015·Molecular Plant-microbe Interactions : MPMI·Yinshan JiaoWenfeng Chen
Jun 17, 2014·Traffic·Anna K HurlockChristoph Benning
Apr 16, 2019·Molecular Plant-microbe Interactions : MPMI·Zaiyong SiYouguo Li
Feb 5, 2019·Frontiers in Plant Science·Morgane Michaud, Juliette Jouhet
Jun 20, 2019·Protein and Peptide Letters·Kaushik DasSwapan K Datta

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