Bioluminescence of Tomopteridae species (Annelida) : multidisciplinary approach

While the majority of bioluminescent pelagic organisms emit blue light, some transparent planktonic annelids (Tomopteridae) have been found to emit yellow light from parapodial glands (rosette and hyaline). Since long wavelengths have a weak propagation coefficient and appear to be imperceptible to most midwater species, this bioluminescence is commonly thought to act as a private communication channel. This work aims to explore this functional hypothesis through a multidisciplinary approach of bioluminescence in Tomopteris helgolandica as main model species and in four related species: T. carpenteri, T. pacifica, T. planktonis and T. septentrionalis. The structural homology between the rosette of the tail-bearing species and the hyaline glands of the tail-less species is evidenced, suggesting that both gland types evolved from a common light-emitting structure and differentiated along a functional and migrational axis extending from endocrine secretion close to the coelomic ramus to exocrine secretion close to the lateral margin of the pinna. In T. helgolandica, bioluminescence is triggered by the activation of nicotinic cholinergic receptors and a Ca2+-dependent mechanism involving L-type volgate-gated channels. Despite significant differences in their light emission patterns, cholinergic control is also suggested in T. planktonis. Indeed, an unexpected diversity in emission patterns is highlighted including yellow and blue, intra- and extraglandular displays. Consequently, the ecological advantage provided by this bioluminescence could be more diverse than originally suspected. Although the first behavioural approach of light perception by T. helgolandica tends to support the hypothesis of intraspecific communication, the possibility of a defensive use of bioluminescence should remain an open question.(SC - Sciences) -- UCL, 201

Changement de couleur physiologique sur des explants de peau de seiche : un outil innovant pour l’évaluation des risques liés aux contaminants

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Changement de couleur physiologique sur des explants de peau de seiche : un outil innovant pour l’évaluation des risques liés aux contaminants

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Evaluation d'un nouvel agent antifouling, la dexmedetomidine, par la quantification du changement de couleur chez la seiche commune

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Evaluation d'un nouvel agent antifouling, la dexmedetomidine, par la quantification du changement de couleur chez la seiche commune

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Convergent Evolution of Attachment Mechanisms in Aquatic Animals

International audienceUnlabelled - WNK kinases are a unique class of serine/threonine protein kinases that lack a conserved catalytic lysine residue in the kinase domain, hence the name WNK (with no K, i.e., lysine). WNK kinases are involved in various physiological processes in plants, such as circadian rhythm, flowering time, and stress responses. In this study, we identified 26 genes in soybean and analyzed their phylogenetic relationships, gene structures, chromosomal distribution, -regulatory elements, expression patterns, and conserved protein motifs. The soybean genes were unevenly distributed on 15 chromosomes and underwent 21 segmental duplication events during evolution. We detected 14 types of -regulatory elements in the promoters of the genes, indicating their potential involvement in different signaling pathways. The transcriptome database revealed tissue-specific and salt stress-responsive expression of genes in soybean, the second of which was confirmed by salt treatments and qRT-PCR analysis. We found that most genes were significantly up-regulated by salt stress within 3 h in both roots and leaves, except for , which showed a distinct expression pattern. Our findings provide valuable insights into the molecular characteristics and evolutionary history of the soybean gene family and lay a foundation for further analysis of gene functions in soybean. Supplementary information - The online version contains supplementary material available at 10.1007/s11032-024-01440-5

Changements de couleur physiologiques en écotoxicologie

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Changements de couleur physiologiques en écotoxicologie

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Evaluation of the common cuttlefish’s behaviour and colour change as sublethal endpoints for the assessment of endocrine disruptors

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Physiological effects of environmental chemicals on colour change in common cuttlefish: ex-vivo quantification on skin explants

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