Dormancy: Metabolite pools prime the cyanobacterial dormancy–resuscitation switch

Current Biology, Journal Year: 2025, Volume and Issue: 35(1), P. R16 - R18

Published: Jan. 1, 2025

Language: Английский

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Red-light signaling pathway activates desert cyanobacteria to prepare for desiccation tolerance

Proceedings of the National Academy of Sciences, Journal Year: 2025, Volume and Issue: 122(12)

Published: March 20, 2025

Desiccation-tolerant cyanobacteria are able to survive frequent cycles of hydration and dehydration, which closely linked diurnal light oscillations. Previous studies have shown that serves as a crucial anticipatory cue, activating desert prepare for desiccation. However, the mechanisms underlying their light-coupled desiccation tolerance remain largely unknown. Here, we demonstrate red-light-induced photosynthetic genes positively regulated by LuxR family transcription factor NfSrr1. We further identified cyanobacteriochrome NfPixJ interacting with NfSrr1 functioning red sensor. Phenotypic analysis revealed red-light signaling module NfPixJ-NfSrr1 plays key role in preparing tolerance. This also regulates synthesis protective compatible solutes, suggesting functions global regulatory signal broader stress response. Phylogenetic indicates presence this pathway, mediated module, correlates ability thrive water-deficit habitats. Overall, our findings uncover pathway enhances encounter at dawn, before water limitation. These results provide insights into behind light-induced organisms.

Language: Английский

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Microcystin production is important for toxic Microcystis to survive long‐term nitrogen starvation

Journal of Phycology, Journal Year: 2025, Volume and Issue: unknown

Published: March 22, 2025

Abstract Toxic cyanobacterial blooms have expanded and intensified on a global scale. Although microcystins are known as the most abundant cyanotoxins released during blooms, physiological role of these toxic secondary metabolites has not been fully resolved. Here, we show that microcystin production is important for Microcystis to maintain carbon metabolism under long‐term nitrogen starvation subsequent recovery. Compared in nonmicrocystin‐producing strains, could accumulate more reserves limitation, which survival cells stressful conditions. Transcriptomic analysis revealed genes involved synthesis were significantly up‐regulated at initial recovery phase, indicating their essential strengthening glycogen catabolism fueling Flow cytometry showed compared nontoxic microcystin‐producing exhibited higher rate after prolonged starvation, consistent with dominance species early stage blooms. The close genetic traits between strains suggest strategies observed here might be highly conserved. Our results imply establishes competitive advantage over provides insights into seasonal succession natural populations.

Language: Английский

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Microbial ecophysiology: Shedding light on the re-greening of chlorotic cyanobacteria

Current Biology, Journal Year: 2024, Volume and Issue: 34(19), P. R893 - R895

Published: Oct. 1, 2024

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