Dopamine functions as an antiherbivore defense in the temperate green alga Ulvaria obscura

Alstyne, Kathryn L. Van; Nelson, Amorah V.; Vyvyan, James R.; Cancilla, Devon A.

doi:10.1007/s00442-006-0378-3

Cited by 70 publications

(29 citation statements)

References 32 publications

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“…Its preferential occurrence in the subtidal zone and its higher N content, in comparison with U. intestinalis (Fong et al 1996), may suggest that U. expansa produce chemical deterrents against herbivores (see Nelson et al 2008). Nonetheless, the high N content in U. obscura was associated with the production of dopamine as the herbivore deterrent, which has never been reported from any marine alga other than U. obscura (Van Alstyne et al 2006).…”

Section: The Role Of Consumers In Controlling Vegetated Soft-bottom Cmentioning

confidence: 85%

Management of natural Ulva spp. blooms in San Quintin Bay, Baja California: Is it justified?

2009

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According to Zertuche-González et al. (2009), Ulva spp. blooms, favored by oyster cultivation, are likely displacing subtidal meadows of Zostera marina in San Quintin Bay, Baja California. The authors propose a partial removal of the seaweed to reduce the risk of eutrophication and eelgrass displacement in the bay. We warn about the removal of Ulva spp. biomass by raising six arguments that emphasize the necessity of a historical and ecosystem-based management for San Quintin Bay. First, processes other than competitive exclusion by Ulva spp. blooms more likely explain changes of Z. marina subtidal meadows in the past decade. Second, there is no consistent evidence that oyster cultivation is promoting blooms of Ulva spp. and the loss of eelgrass. Third, the removal of Ulva spp. biomass is based on experiences of heavily anthropogenically eutrophic systems, while San Quintin Bay is not. Fourth, the proposed course of actions to restore eelgrass meadows ignores general historical baselines of estuarine and coastal systems by confusing what it means to be "pristine." Fifth, despite the important experimental evidence indicating strong top-down control in temperate seagrass meadows, Zertuche-González et al. (2009) underestimated the capacity of consumers in structuring dynamics of vegetated softbottom communities in San Quintin Bay. Sixth, Ulva expansa may exert positive effects on seagrass ecosystem properties and functions. Instead, we propose protection against the propagation of unsustainable practices in the bay, and the reintroduction of large consumers that are now absent in this ecosystem. An ecosystem-based analysis of the role of Ulva spp. on eelgrass dynamics is needed.

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Section: The Role Of Consumers In Controlling Vegetated Soft-bottom Cmentioning

confidence: 85%

Management of natural Ulva spp. blooms in San Quintin Bay, Baja California: Is it justified?

2009

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“…Unfortunately, however, none of the synthetic enzymes in the path from all-trans-geranylgeranyl diphosphate synthase to forskolin has been reported in plants or animals, precluding a direct examination for de novo production. Although unconventional, it is conceivable that forskolin may be synthesized in human kidneys, similar to the appearance of ouabain in adrenal tissue (21) and catecholamines in plants (22). It is interesting to note that the isolation from an animal source of ouabain, another scarce chemical that is synthesized by plants, began with the extraction of 20 kg of fresh bovine adrenal tissue (21).…”

Section: Discussionmentioning

confidence: 99%

Identification of a Forskolin-Like Molecule in Human Renal Cysts

Putnam¹,

Swenson²,

Reif³

et al. 2007

Journal of the American Society of Nephrology

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Renal cyst enlargement is increased by adenosine cAMP, which is produced within mural epithelial cells. In a search for modulators of cAMP synthesis cyst fluids from 18 patients with autosomal dominant or recessive polycystic kidney disease (PKD) were analyzed, and in 15 of them, a stable lipophilic molecule that increased cAMP levels, stimulated transepithelial chloride and fluid secretion, and promoted the proliferation of human cyst epithelial cells was characterized. With the use of HPLC-mass spectrometry, a bioactive lipid with the same mass spectral fingerprint, the same chromatographic retention time, and the same biologic properties as forskolin, a widely known, potent adenylyl cyclase agonist, has been isolated and identified within the cyst fluid. Forskolin is synthesized by the plant Coleus forskohlii, but its appearance or compounds like it have not been reported in animals. The origin of forskolin in patients with PKD was not revealed by this study. Synthesis by mural cyst epithelial cells or an exogenous source are the most likely possibilities. Forskolin is sold for weight management and as a cardiovascular tonic in health stores and through the Worldwide Web. It is concluded that forskolin may have a role in promoting the enlargement of cysts in autosomal dominant PKD and recommended that patients avoid oral and parenteral preparations that contain this compound.

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“…The effects of physiologically active compounds released from water-lived plant species show possible interactions between allelochemicals excreted and acceptor cells. Dopamine is known to be excreted from green algae Ulvaria obscura (van Alstyne et al 2006) and contained in Lemna spp. (Roshchina 2001a).…”

Section: Multicellular Biosensorsmentioning

confidence: 99%

Microscopy for Modeling of Cell–Cell Allelopathic Interactions

et al. 2012

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The application of various microscopy methods-from stereomicroscopy to luminescence microscopy, microspectrofluorimetry and laser-scanning confocal microscopy-has been considered as an approach to model the cell-cell contacts and interactions in allelopathy. It bases on the direct observations of both secretions released from allelopathic species and the interaction(s) with the cell acceptors as biosensors (unicellular plant generative and vegetative microspores). Special attention was paid to the interactions with pigmented and fluorescing components of the secretions released by the cell donors from allelopathically active plant species. Colored allelochemicals are considered as histochemical dyes for the analysis of cellular mechanisms at the allelopathic contacts. IntroductionThe study of cell-cell interactions in allelopathy has been achieved using various types of microscopic methods as has been shown for analysis of pollen-pollen interactions analyzed by microspectrofluorimetry Melnikova 1996, 1999) or laser-scanning confocal microscopy (Roshchina et al. 2007(Roshchina et al. , 2009a. The technique may be suitable for the investigation of allelopathic mechanisms when one cell (a donor cell) releases a molecule that is received by another cell (an acceptor cell) belonging to different species. For this aim it should consider the microscopy for the observation of plant cell, viz.

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Dopamine functions as an antiherbivore defense in the temperate green alga Ulvaria obscura

Cited by 70 publications

References 32 publications

Management of natural Ulva spp. blooms in San Quintin Bay, Baja California: Is it justified?

Management of natural Ulva spp. blooms in San Quintin Bay, Baja California: Is it justified?

Identification of a Forskolin-Like Molecule in Human Renal Cysts

Microscopy for Modeling of Cell–Cell Allelopathic Interactions

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