Gunnera is the only genus of angiosperms known to host cyanobacteria and the only group of land plants that hosts cyanobacteria intracellularly. Motile filaments of cyanobacteria, known as hormogonia, colonize Gunnera plants through cells in the plant's specialized stem glands. It is commonly held
Gunnera plants have the unique ability to form endosymbioses with N(2)-fixing cyanobacteria, primarily Nostoc. Cyanobacteria enter Gunnera through transiently active mucilage-secreting glands on stems. We took advantage of the nitrogen (N)-limitation-induced gland development in Gunnera manicata to
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