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Light is more important than nutrient ratios of fertilization for cymodocea nodosa seedling development

2018-06Journal article Open Access
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dc.contributor.authorAlexandre, Ana
dc.contributor.authorSilva, João
dc.contributor.authorSantos, Rui
dc.date.accessioned2018-12-07T14:53:25Z
dc.date.available2018-12-07T14:53:25Z
dc.date.issued2018-06
dc.description.abstractRestoration of seagrass beds through seedlings is an alternative to the transplantation of adult plants that reduces the impact over donor areas and increases the genetic variability of restored meadows. To improve the use of Cymodocea nodosa seedlings, obtained from seeds germinated in vitro, in restoration programs, we investigated the ammonium and phosphate uptake rates of seedlings, and the synergistic effects of light levels (20 and 200 mu mol quanta m(-2) s(-1)) and different nitrogen to phosphorus molar ratios (40 mu M N:10 mu M P, 25 mu M N:25 mu M P, and 10 mu N:40 mu M P) on the photosynthetic activity and growth of seedlings. The nutrient content of seedlings was also compared to the seed nutrient reserves to assess the relative importance of external nutrient uptake for seedling development. Eighty two percent of the seeds germinated after 48 days at a mean rate of 1.5 seeds per day. All seedlings under all treatments survived and grew during the 4 weeks of the experiment. Seedlings of C. nodosa acquired ammonium and phosphate from the incubation media while still attached to the seed, at rates of about twice of adult plants. The relevance of external nutrient uptake was further highlighted by the observation that seedlings' tissues were richer in nitrogen and phosphorus than non-germinated seeds. The uptake of ammonium followed saturation kinetics with a half saturation constant of 32 mu M whereas the uptake of phosphate increased linearly with nutrient concentration within the range tested (5 - 100 mu M). Light was more important than the nutrient ratio of fertilization for the successful development of the young seedlings. The seedlings' photosynthetic and growth rates were about 20% higher in the high light treatment, whereas different nitrogen to phosphorus ratios did not significantly affect growth. The photosynthetic responses of the seedlings to changes in the light level and their capacity to use external nutrient sources showed that seedlings of C. nodosa have the ability to rapidly acclimate to the surrounding light and nutrient environment while still attached to the seeds. C. nodosa seedlings experiencing fertilization under low light levels showed slightly enhanced growth if nourished with a balanced formulation, whereas a slight increase in growth was also observed with unbalanced formulations under a higher light level. Our results highlight the importance of high light availability at the seedling restoration sites.
dc.description.sponsorshipDepartment of the Environment, Heritage and Climate Change of Gibraltar; FCT, the Portuguese Foundation for Science and Technology [SFRH/BPD/91629/2012]; FCT [UID/Multi/04326/2013]
dc.identifier.doi10.3389/fpls.2018.00768
dc.identifier.issn1664-462X
dc.identifier.urihttp://hdl.handle.net/10400.1/11504
dc.language.isoeng
dc.peerreviewedyes
dc.publisherFrontiers Media Sa
dc.relationEFFECTS OF OCEAN ACIDIFICATION ON THE NITROGEN BUDGET OF SEAGRASSES: ROLE OF ORGANIC VS. INORGANIC SOURCES
dc.relationCentre of Marine Sciences
dc.subjectEelgrass Zostera-Marina
dc.subjectLarge-Scale Restoration
dc.subjectPosidonia-Oceanica
dc.subjectWestern-Australia
dc.subjectSeagrass Ecosystems
dc.subjectUptake Kinetics
dc.subjectCanary-Islands
dc.subjectChesapeake Bay
dc.subjectReproductive Phenology
dc.subjectThalassia-Testudinum
dc.titleLight is more important than nutrient ratios of fertilization for cymodocea nodosa seedling development
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEFFECTS OF OCEAN ACIDIFICATION ON THE NITROGEN BUDGET OF SEAGRASSES: ROLE OF ORGANIC VS. INORGANIC SOURCES
oaire.awardTitleCentre of Marine Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F91629%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.startPage768
oaire.citation.titleFrontiers In Plant Science
oaire.citation.volume9
oaire.fundingStream6817 - DCRRNI ID
person.familyNameAlexandre
person.familyNameSilva
person.familyNameSantos
person.givenNameAna
person.givenNameJoão
person.givenNameRui
person.identifier82814
person.identifier42560
person.identifier.ciencia-idA711-4AF6-8F36
person.identifier.ciencia-id8216-527E-1BD4
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0001-7164-1487
person.identifier.orcid0000-0002-7211-1661
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridJ-7874-2013
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id35836826900
person.identifier.scopus-author-id7403023547
person.identifier.scopus-author-id7201375018
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication61040b53-b17a-40f6-b42e-f5476a7a6ddb
relation.isAuthorOfPublication84487ca8-404a-4584-81f0-3662c340d712
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