Signalling in Cyanobacteria–Plant Symbioses

Adams, David G.; Duggan, Paula S.

doi:10.1007/978-3-642-20966-6_5

Cited by 26 publications

(12 citation statements)

References 111 publications

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“…Host signals and their corresponding genes in cyanobacteria are well characterized (Cohen and Meeks ; Rai et al . ; Adams and Duggan ); however, a reverse situation is less investigated. Despite of limited reports on transcriptional regulations of host gene, one could easily conclude that cyanobacterial signals causes a change in genetic expression by observing changes in the physiological, biochemical and morphological parameters of the host plant (Chapman and Margulis ).…”

Section: Cyanobacterial Signalling In Symbiotic Associationmentioning

confidence: 99%

A review on possible elicitor molecules of cyanobacteria: their role in improving plant growth and providing tolerance against biotic or abiotic stress

Singh

2014

J Appl Microbiol

144

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Cyanobacteria are prominent inhabitants of many agricultural soils, where they potentially contribute towards biological nitrogen fixation, help in phosphate solubilization and mineral release to improve soil fertility and crop productivity. However, beside naturally fertilizing and balancing mineral nutrition in the soil, many cyanobacteria are known to release various kinds of biologically active substances like proteins, vitamins, carbohydrates, amino acids, polysaccharides and phytohormones that function as elicitor molecules to promote plant growth and help them to fight against biotic and abiotic stress. These metabolites produced by the cyanobacteria affect the gene expression of the host plants and thereby bring about qualitative and quantitative changes in the phytochemical composition of the plants. Experiments carried out with live inoculum or with the extracts of cyanobacterial strains on several plant species, such as rice, wheat, maize, cotton etc., have demonstrated the synthesis of signalling metabolites. Thus, in view of its beneficial effect, this paper reviews the role of cyanobacteria in triggering the growth and development of plants and hence its utilization in agriculture.

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Section: Cyanobacterial Signalling In Symbiotic Associationmentioning

confidence: 99%

A review on possible elicitor molecules of cyanobacteria: their role in improving plant growth and providing tolerance against biotic or abiotic stress

Singh

2014

J Appl Microbiol

144

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“…This result suggests that feather mosses are highly selective towards the cyanobacterial strains that they host. Consequently, these results raise the possibility that mosses may secrete compounds that serve as chemo‐attractants for cyanobacteria, and that these cyanobacteria could in turn contribute to moss nutrition by providing mosses with fixed N, in the same manner as has been shown for vascular plant–cyanobacterial symbioses (Adams & Duggan, ).…”

Section: Introductionmentioning

confidence: 99%

Boreal feather mosses secrete chemical signals to gain nitrogen

et al. 2013

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SummaryThe mechanistic basis of feather moss-cyanobacteria associations, a main driver of nitrogen (N) input into boreal forests, remains unknown. Here, we studied colonization by Nostoc sp. on two feather mosses that form these associations (Pleurozium schreberi and Hylocomium splendens) and two acrocarpous mosses that do not (Dicranum polysetum and Polytrichum commune). We also determined how N availability and moss reproductive stage affects colonization, and measured N transfer from cyanobacteria to mosses.The ability of mosses to induce differentiation of cyanobacterial hormogonia, and of hormogonia to then colonize mosses and re-establish a functional symbiosis was determined through microcosm experiments, microscopy and acetylene reduction assays. Nitrogen transfer between cyanobacteria and Pleurozium schreberi was monitored by secondary ion mass spectrometry (SIMS).All mosses induced hormogonia differentiation but only feather mosses were subsequently colonized. Colonization on Pleurozium schreberi was enhanced during the moss reproductive phase but impaired by elevated N. Transfer of N from cyanobacteria to their host moss was observed.Our results reveal that feather mosses likely secrete species-specific chemo-attractants when N-limited, which guide cyanobacteria towards them and from which they gain N. We conclude that this signalling is regulated by N demands of mosses, and serves as a control of N input into boreal forests.

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“…The spacing of heterocysts ensures that all cells in the filament maintain a constant supply of both fixed nitrogen and fixed carbon. Intercellular communication between heterocysts and vegetative cells, which requires specific junction proteins and also appears to depend on intercellular channels, is critical for the maintenance of the filament (6)(7)(8).…”

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confidence: 99%

Regulation of Nitrogenase Gene Expression by Transcript Stability in the Cyanobacterium Anabaena variabilis

Pratte

Thiel

2014

Journal of Bacteriology

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The nitrogenase gene cluster in cyanobacteria has been thought to comprise multiple operons; however, in Anabaena variabilis, the promoter for the first gene in the cluster, nifB1, appeared to be the primary promoter for the entire nif cluster. The structural genes nifHDK1 were the most abundant transcripts; however, their abundance was not controlled by an independent nifH1 promoter, but rather, by RNA processing, which produced a very stable nifH1 transcript and a moderately stable nifD1 transcript. There was also no separate promoter for nifEN1. In addition to the nifB1 promoter, there were weak promoters inside the nifU1 gene and inside the nifE1 gene, and both promoters were heterocyst specific. In an xisA mutant, which effectively separated promoters upstream of an 11-kb excision element in nifD1 from the downstream genes, the internal nifE1 promoter was functional. Transcription of the nif1 genes downstream of the 11-kb element, including the most distant genes, hesAB1 and fdxH1, was reduced in the xisA mutant, indicating that the nifB1 promoter contributed to their expression. However, with the exception of nifK1 and nifE1, which had no expression, the downstream genes showed low to moderate levels of transcription in the xisA mutant. The hesA1 gene also had a promoter, but the fdxH gene had a processing site just upstream of the gene. The processing of transcripts at sites upstream of nifH1 and fdxH1 correlated with increased stability of these transcripts, resulting in greater amounts than transcripts that were not close to processing sites.

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Signalling in Cyanobacteria–Plant Symbioses

Cited by 26 publications

References 111 publications

A review on possible elicitor molecules of cyanobacteria: their role in improving plant growth and providing tolerance against biotic or abiotic stress

A review on possible elicitor molecules of cyanobacteria: their role in improving plant growth and providing tolerance against biotic or abiotic stress

Boreal feather mosses secrete chemical signals to gain nitrogen

Regulation of Nitrogenase Gene Expression by Transcript Stability in the Cyanobacterium Anabaena variabilis

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