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Influence of irradiance, dissolved nutrients and salinity on the colour and nutritional characteristics of Gracilariopsis longissima (Rhodophyta)

2020-12Journal article Restricted access
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dc.contributor.authorBermejo, Ricardo
dc.contributor.authorMacias, Manuel
dc.contributor.authorSanchez-Garcia, Fini
dc.contributor.authorLove, Robyn
dc.contributor.authorE, Varela-Álvarez
dc.contributor.authorHernandez, Ignacio
dc.date.accessioned2021-06-18T16:26:46Z
dc.date.available2021-06-18T16:26:46Z
dc.date.issued2020-12
dc.description.abstractColour is immediately perceived by the consumer and crucial for food product attractiveness. In this study, the possibility of obtaining different colour morphotypes in the rhodophyte Gracilariopsis longissima using short cultivation protocols (i.e. 9 days) was explored. In a first factorial experiment, the effects of salinity (25‰, 35‰ and 45‰), irradiance (60 and 270 μmol photons m− 1 s − 1 ) and nutrient conditions (N and P enrichment, no enrichment) on the growth, pigment concentration and colour of G. longissima were assessed. The results indicated that growth rate and phycocyanin were influenced by the three variables, whereas the concentration of other pigments (chlorophyll a, carotenoids and phycoerythrin) was significantly influenced by irradiance and nutrient conditions. The colour, defined as the Red, Green, Blue (RGB) signal from the photographed thalli, was mainly affected by irradiance and nutrient conditions. In a second experiment, four culture conditions yielding contrasting colour morphotypes and growth rates were repeatedly scaled up in the experiment to get enough biomass and to analyze nutritional properties (lipids, proteins, tissue N and P). The colour morphotypes and the corresponding culture conditions selected were: i) dark red; high salinity, low irradiance, nutrient enrichment; ii) light red; medium salinity, high irradiance, nutrient enrichment; iii) brownish; low salinity, low irradiance; no enrichment; and iv) green-yellowish; low salinity, high irradiance, no enrichment. These conditions caused marked differences in the nutritional properties of the thalli. The light red colour showed the best nutritional characteristics. Overall, G. longissima was not a suitable source of omega 3, but can be a source of Fe (0.34–0.53 mg g− 1 DW) and K (103–161 mg g− 1 DW), and its K:Na ratio can be enhanced under increasing salinity. The fast ecophysiological response, and its wide tolerance to environmental conditions, makes this species an excellent candidate for the development of short cultivation protocols.
dc.description.sponsorshipConsejerfa de Economfa y Conocimiento de la Junta de Andalucia [1235]
dc.description.sponsorship2014-2020 ERDF Operational Programme
dc.description.sponsorshipDepartment of Economy, Knowledge, Business and University of the Regional Government of Andalusia [FEDER-UCA18-106875]
dc.description.sponsorshipSpanish Ministry of Education, Culture and Sport [PRX19/00020]
dc.description.sponsorshipFCT Portuguese Foundation for Science and Technology [UIDB/04326/2020, SFRH/BPD/109452/2015, DL 57/2016/CP1361/CT0037]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.algal.2020.102121
dc.identifier.issn2211-9264
dc.identifier.urihttp://hdl.handle.net/10400.1/15925
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectColour
dc.subjectGracilariopsis
dc.subjectIrradiance
dc.subjectNutrient
dc.subjectOgonori
dc.subjectSalinity
dc.subject.otherBiotechnology & Applied Microbiology
dc.titleInfluence of irradiance, dissolved nutrients and salinity on the colour and nutritional characteristics of Gracilariopsis longissima (Rhodophyta)
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage102121
oaire.citation.titleAlgal Research-Biomass Biofuels and Bioproducts
oaire.citation.volume52
person.familyNameVarela-Álvarez
person.givenNameElena
person.identifier.orcid0000-0001-7262-3475
person.identifier.ridM-4495-2013
person.identifier.scopus-author-id6507326527
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationef711891-6a98-415b-8eed-e2e45f176b80
relation.isAuthorOfPublication.latestForDiscoveryef711891-6a98-415b-8eed-e2e45f176b80

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