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  • Aronsson, Henrik,1971Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences (author)

Monogalactosyldiacylglycerol deficiency in Arabidopsis affects pigment composition in the prolamellar body and impairs thylakoid membrane energization and photoprotection in leaves

  • Article/chapterEnglish2008

Publisher, publication year, extent ...

  • 2008-07-18
  • Oxford University Press (OUP),2008
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-58514
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-58514URI
  • https://doi.org/10.1104/pp.108.123372DOI
  • https://gup.ub.gu.se/publication/78645URI
  • https://gup.ub.gu.se/publication/195717URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • authorCount :7
  • Monogalactosyldiacylglycerol (MGDG) is the major lipid constituent of chloroplast membranes and has been proposed to act directly in several important plastidic processes, particularly during photosynthesis. In this study, the effect of MGDG deficiency, as observed in the monogalactosyldiacylglycerol synthase1-1 (mgd1-1) mutant, on chloroplast protein targeting, phototransformation of pigments, and photosynthetic light reactions was analyzed. The targeting of plastid proteins into or across the envelope, or into the thylakoid membrane, was not different from wild-type in the mgd1 mutant, suggesting that the residual amount of MGDG in mgd1 was sufficient to maintain functional targeting mechanisms. In dark-grown plants, the ratio of bound protochlorophyllide (Pchlide, F656) to free Pchlide (F631) was increased in mgd1 compared to the wild type. Increased levels of the photoconvertible pigment-protein complex (F656), which is photoprotective and suppresses photooxidative damage caused by an excess of free Pchlide, may be an adaptive response to the mgd1 mutation. Leaves of mgd1 suffered from a massively impaired capacity for thermal dissipation of excess light due to an inefficient operation of the xanthophyll cycle; the mutant contained less zeaxanthin and more violaxanthin than wild type after 60 min of high-light exposure and suffered from increased photosystem II photoinhibition. This is attributable to an increased conductivity of the thylakoid membrane at high light intensities, so that the proton motive force is reduced and the thylakoid lumen is less acidic than in wild type. Thus, the pH-dependent activation of the violaxanthin de-epoxidase and of the PsbS protein is impaired.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Schottler, Mark A. (author)
  • Kelly, Amelie A.Stockholms universitet,Institutionen för biokemi och biofysik (author)
  • Sundqvist, Christer,1943Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences(Swepub:gu)xsunch (author)
  • Dormann, Peter (author)
  • Karim, Sazzad,1966Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences(Swepub:gu)xkasaz (author)
  • Jarvis, Paul (author)
  • Göteborgs universitetInstitutionen för växt- och miljövetenskaper (creator_code:org_t)

Related titles

  • In:Plant Physiology: Oxford University Press (OUP)148:1, s. 580-5920032-08891532-2548

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