Plastid gene expression is not associated with midday depression in CO(2) assimilation and electron transport.
Identifieur interne : 004782 ( Main/Exploration ); précédent : 004781; suivant : 004783Plastid gene expression is not associated with midday depression in CO(2) assimilation and electron transport.
Auteurs : Trivedi [Inde] ; Reddy ; SaneSource :
- Plant science : an international journal of experimental plant biology [ 1873-2259 ] ; 2000.
Abstract
To investigate the effect of diurnal variations on chloroplastic electron transport as well as accumulation of gene products associated with it, studies were carried out on Populus deltoides, a tree species. Electron transport studies showed two peak responses as a large diurnal change with pronounced midday depression in whole chain (H(2)O--> MV) as well as partial reactions for PSII (H(2)O-->PBQ) and PSI (DCPIP-->MV). The electron transport rates first increased from 05:00 h to a maximum at around 09:00 h and then showed a decrease at 13:00 h followed by recovery and further decrease. The pigments associated with electron transport chain did not show any change during the day. Surprisingly midday depression in the accumulation of transcripts and polypeptides related to electron transport was not observed. This suggests that chloroplastic gene expression is not associated with the midday depression observed for both CO(2) assimilation and electron transport. Studies on the transcripts of psbD/C operon during the day showed that there were differences in the processing pattern although the steady state levels of the processed transcripts of this operon did not show any variation.
DOI: 10.1016/s0168-9452(00)00218-1
PubMed: 10814822
Affiliations:
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Electron transport studies showed two peak responses as a large diurnal change with pronounced midday depression in whole chain (H(2)O--> MV) as well as partial reactions for PSII (H(2)O-->PBQ) and PSI (DCPIP-->MV). The electron transport rates first increased from 05:00 h to a maximum at around 09:00 h and then showed a decrease at 13:00 h followed by recovery and further decrease. The pigments associated with electron transport chain did not show any change during the day. Surprisingly midday depression in the accumulation of transcripts and polypeptides related to electron transport was not observed. This suggests that chloroplastic gene expression is not associated with the midday depression observed for both CO(2) assimilation and electron transport. Studies on the transcripts of psbD/C operon during the day showed that there were differences in the processing pattern although the steady state levels of the processed transcripts of this operon did not show any variation.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">10814822</PMID><DateRevised><Year>2020</Year><Month>09</Month><Day>30</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1873-2259</ISSN><JournalIssue CitedMedium="Internet"><Volume>155</Volume><Issue>2</Issue><PubDate><Year>2000</Year><Month>Jun</Month><Day>29</Day></PubDate></JournalIssue><Title>Plant science : an international journal of experimental plant biology</Title><ISOAbbreviation>Plant Sci</ISOAbbreviation></Journal><ArticleTitle>Plastid gene expression is not associated with midday depression in CO(2) assimilation and electron transport.</ArticleTitle><Pagination><MedlinePgn>187-192</MedlinePgn></Pagination><Abstract><AbstractText>To investigate the effect of diurnal variations on chloroplastic electron transport as well as accumulation of gene products associated with it, studies were carried out on Populus deltoides, a tree species. Electron transport studies showed two peak responses as a large diurnal change with pronounced midday depression in whole chain (H(2)O--> MV) as well as partial reactions for PSII (H(2)O-->PBQ) and PSI (DCPIP-->MV). The electron transport rates first increased from 05:00 h to a maximum at around 09:00 h and then showed a decrease at 13:00 h followed by recovery and further decrease. The pigments associated with electron transport chain did not show any change during the day. Surprisingly midday depression in the accumulation of transcripts and polypeptides related to electron transport was not observed. This suggests that chloroplastic gene expression is not associated with the midday depression observed for both CO(2) assimilation and electron transport. Studies on the transcripts of psbD/C operon during the day showed that there were differences in the processing pattern although the steady state levels of the processed transcripts of this operon did not show any variation.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Trivedi</LastName><Initials>PK</Initials><AffiliationInfo><Affiliation>Division of Plant Molecular Biology and Genetic Engineering, National Botanical Research Institute, Lucknow, India</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Reddy</LastName><Initials>MS</Initials></Author><Author ValidYN="Y"><LastName>Sane</LastName><Initials>PV</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>Ireland</Country><MedlineTA>Plant Sci</MedlineTA><NlmUniqueID>9882015</NlmUniqueID><ISSNLinking>0168-9452</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2000</Year><Month>5</Month><Day>18</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2000</Year><Month>5</Month><Day>18</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2000</Year><Month>5</Month><Day>18</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">10814822</ArticleId><ArticleId IdType="pii">S0168945200002181</ArticleId><ArticleId IdType="doi">10.1016/s0168-9452(00)00218-1</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Inde</li></country></list><tree><noCountry><name sortKey="Reddy" sort="Reddy" uniqKey="Reddy" last="Reddy">Reddy</name><name sortKey="Sane" sort="Sane" uniqKey="Sane" last="Sane">Sane</name></noCountry><country name="Inde"><noRegion><name sortKey="Trivedi" sort="Trivedi" uniqKey="Trivedi" last="Trivedi">Trivedi</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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