Linked Life Data

16547406

Source:http://linkedlifedata.com/resource/pubmed/id/16547406

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2006-3-20
pubmed:abstractText
Didemnum molle is a colonial ascidian that harbors the prokaryotic photosymbiont Prochloron in its cloacal cavity. Colonies occur over a relatively wide bathymetric range (approximately 0-30 m), and colony color is widely variable, partly depending on depth. Colonies in shallow sites are bright white, with densely distributed spicules, and often with brown or dark gray pigmentation, while colonies in deeper sites are less pigmented, with sparsely distributed spicules. Didemnum molle colonies contain mycosporine-like amino acids (MAAs) as UV-absorbing substances. These include mycosporine-glycine, shinorine, and porphyra-334. Among colonies from 5-, 10-, 15-, and 20-m depths, the concentration of total MAAs was significantly high at 10 m and low at 20 m. Colonies at 10 m need to maintain low spicule densities to have enough photosynthetically active radiation (PAR) to maintain the photosymbionts, and they probably concentrate MAAs to block UV radiation without attenuating PAR. Because high levels of PAR cause photoinhibition of photosynthesis, spicules and pigment cells would be more effective for photoprotection in shallow water. Colonies of D. molle may adjust the light conditions for photosymbionts by combining MAAs, spicules, and pigment cells in varying amounts.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0289-0003
pubmed:author
pubmed:issnType
Print
pubmed:volume
23
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
57-63
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
UV protection in the photosymbiotic ascidian Didemnum molle inhabiting different depths.
pubmed:affiliation
Department of Chemistry, Biology, and Marine Science, Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan. euichi@sci.u-ryukyu.ac.jp
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't