The molecular anatomy and function of thylakoid proteins

Marder, Jonathan B.; Barber, James

doi:10.1111/j.1365-3040.1989.tb01228.x

Cited by 37 publications

(12 citation statements)

References 140 publications

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“…The thylakoid membranes of plant chloroplasts carry out the light reactions of photosynthesis in two photosystems, Photosystems I and II (PS I and PS II) (Marder and Barber 1989). Light energy for these reactions is largely gathered by the light harvesting complexes (LHC I and LHC II) associated with each photosystem.…”

Section: Introductionmentioning

confidence: 99%

Light-independent synthesis of LHC IIb polypeptides and assembly of the major pigmented complexes during the initial stages of Pinus palustris seedling development

1993

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Pinus palustris has a greatly reduced need for light to initiate chloroplast development in comparison to angiosperms. Light is not required for chlorophyll synthesis in dark-grown Pinus palustris seedlings. However, embryos do not contain chlorophyll, and synthesis is limited to seedlings having cotyledon lengths between about 0.5 cm and 2.0 cm. The final amount of chlorophyll accumulated by dark-grown seedlings is about one fifth of that in light-grown seedlingsat the same stage. The major light-harvesting chlorophyll a/b-polypeptides of Photosystem II (LHC IIb) are absent in the embryos but begin to accumulate in seedlings of 0.5 cm cotyledon length, irrespective of the light conditions. Although dark-grown seedlings accumulate most of the pigmented complexes seen in light-grown seedlings, there are differences in the subunit structure of some of them. These findings suggest that the majority of the components of the photosynthetic membrane do not require light for induction of synthesis or assembly into complexes, but that the final forms seen in light-grown seedlings may require light.

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Section: Introductionmentioning

confidence: 99%

Light-independent synthesis of LHC IIb polypeptides and assembly of the major pigmented complexes during the initial stages of Pinus palustris seedling development

1993

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“…Transcripts for eight chloroplast genes with identity to mitochondrial subunit genes have been characterized [20,28,32] leading to speculation that a thylakoid NAD(P)H dehydrogenase homologous to the mitochondrial complex may be functional at some point in plastid development [ 19]. Chloroplast localized NAD(P)H-plastoquinone oxidoreductase activity or chlororespiration has been detected in Chlamydomonas reinhardtii [6,12,18], and more recently, chlororespiration activity involving a cyanide-sensitive component has been detected in protoplasts and open-cell preparations of tobacco and in isolated chloroplasts of pea [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Partial conservation of the 5? ndhE-psaC-ndhD 3? gene arrangement of chloroplasts in the cyanobacterium Synechocystis sp. PCC 6803: implications for NDH-D function in cyanobacteria and chloroplasts

Anderson

McIntosh

1991

Plant Mol Biol

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The psaC gene, which encodes the 8.9 kDa iron-sulfur containing subunit of Photosystem I, has been sequenced from Synechocystis sp. PCC 6803 and shows greater similarity to reported plant sequences than other cyanobacterial psaC sequences. The deduced amino acid sequence of the protein encoded by the Synechocystis psaC gene is identical to the tobacco PSA-C sequence. In plants psaC is located in the small single-copy region of the chloroplast genome between two genes (designated ndhE and ndhD) with similarity to genes encoding subunits of the mitochondrial NADH Dehydrogenase Complex I. The 5' ndhE-psaC-ndhD3' gene arrangement of higher plants is only partially conserved in Synechocystis. An open reading frame (ORF) upstream of the Synechocystis psaC gene has 85% identity to the tobacco ndhE gene. Downstream of psaC there is a 273 bp ORF with 48% identity to the 5' portion of the tobacco ndhD gene (1527 bp). psaC, ndhE and the region of similarity to ndhD are present in a single copy in the Synechocystis genome. Part of the wheat ndhD gene was sequenced and used as a probe for the presence of the 3' portion of the ndhD gene. The wheat ndhD probe did not hybridize to Synechocystis or Anabaena sp. PCC 7120 genomic DNA, but did hybridize to Oenothera chloroplast DNA. These results indicate the complete ndhD gene is absent in two cyanobacteria, and raises the question of what role, if any, the ndhD gene product plays in the facultative heterotroph Synechocystis sp. PCC 6803.

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“…Esses processos de síntese ocorrem no estroma do cloroplasto, a região aquosa que circunda as tilacóides. 11 No cloroplasto, a energia da luz é captada por duas diferentes unidades funcionais chamadas fotossistemas. A energia luminosa absorvida é usada para a transferência de elétrons ao longo de uma série de compostos que atuam como doadores e receptores de elétrons.…”

Section: Fase Fotoquímica (Reações De Luz)unclassified

Physiological and Environmental Aspects of Photosynthesis

Kluge¹,

Tezotto-Uliana²,

Silva³

2015

Revista Virtual De Química

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Rev. Virtual Quim. |Vol 7| |No. 1| |56-73| 56 ArtigoAspectos Fisiológicos e Ambientais da Fotossíntese Kluge, R. A.;* Tezotto-Uliana, J. V.; da Silva, P. P. M. Rev. Virtual Quim., 2015, 7 (1), 56-73. Data de publicação na Web: 30 de novembro de 2014 http://www.uff.br/rvq Physiological and Environmental Aspects of PhotosynthesisAbstract: Undoubtedly, photosynthesis is one of the most important process for the life planet maintenance. The sun releases radiant energy that is able to boost the photosynthetic apparatus of the plants, which produce carbohydrates that will be used in the respiration. Among the most important reactions of photosynthesis is the release of oxygen, essential for respiration, which happens in photosystem II. The products generated in the first phase of photosynthesis or photochemical phase (ATP and NADPH) are used in the second phase or the carbon fixation phase. In this second phase acts the Rubisco enzyme, the key enzyme of photosynthesis for the production of carbohydrates such as starch and sucrose. Several factors interfere in the photosynthesis, such as temperature, oxygen and carbon dioxide content, light level, water availability and others. The knowledge of these interferences has aided in the development of technologies to maximize agricultural productivity and enable agroclimatic zoning of many cultures.Keywords: Sunlight; photosystem; radiation; Calvin-Benson cycle; rubisco. ResumoA fotossíntese é sem dúvidas um dos processos mais importantes para a manutenção da vida no planeta. O sol, através da liberação de sua energia radiante, é capaz de impulsionar o aparato fotossintético das plantas e produzir carboidratos que serão utilizados no processo respiratório. Dentre as reações mais importantes da fotossíntese está a liberação de oxigênio, imprescindível para a respiração, que ocorre no fotossistema II. Os produtos gerados na primeira fase da fotossíntese, ou fase fotoquímica (NADPH e ATP) são usados na segunda fase ou fase de fixação de carbono. Nessa segunda fase atua a enzima Rubisco, a principal enzima da fotossíntese, para a produção de carboidratos, como amido e sacarose. Vários fatores interferem na fotossíntese, como temperatura, teores de oxigênio e de gás carbônico, nível de luminosidade, disponibilidade hídrica, entre outros. O conhecimento de suas interferências tem auxiliado no desenvolvimento de tecnologias para maximizar a produtividade agrícola e possibilitar o zoneamento agroclimático de muitas culturas.Palavras-chave: Luz solar; fotossistema; radiação; ciclo de Calvin-Benson; rubisco. * U ive sidade de "ão Paulo, Es ola "upe io de Ag i ultu a Luiz de Quei oz , Depa ta e to

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The molecular anatomy and function of thylakoid proteins

Cited by 37 publications

References 140 publications

Light-independent synthesis of LHC IIb polypeptides and assembly of the major pigmented complexes during the initial stages of Pinus palustris seedling development

Light-independent synthesis of LHC IIb polypeptides and assembly of the major pigmented complexes during the initial stages of Pinus palustris seedling development

Partial conservation of the 5? ndhE-psaC-ndhD 3? gene arrangement of chloroplasts in the cyanobacterium Synechocystis sp. PCC 6803: implications for NDH-D function in cyanobacteria and chloroplasts

Physiological and Environmental Aspects of Photosynthesis

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