1995
DOI: 10.1007/bf00020186
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Loss of chloroplast transcripts for proteins associated with photosystem II: an early event during heat-bleaching in Euglena gracilis

Abstract: A shift in the ratio of chlorophyll (Chl) a and Chl b is an early indicator of heat bleaching in Euglena gracilis. This observation prompted us to consider whether or not changes in steady-state levels of chloroplast transcripts and in transcriptional activity could limit the synthesis of Chl a-binding proteins in bleaching plastids. We found that the mature transcripts for CP47 and CP43, the Chl a-binding apoproteins of the proximal antenna of photosystem II, decline sharply very early during bleaching. Our s… Show more

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Cited by 11 publications
(4 citation statements)
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“…In this study, the carotenoid concentration was less in the bleaching susceptible cultivar Butterfly, suggesting carotenoid content may play an important role in preventing bleaching in ivy geranium. The decreased Chl a and Caro but increased Chl a:Caro, Chl b:Caro, and total Chl:Caro ratios in 'Butterfly' support previous findings that reduced carotenoid concentrations may not give sufficient protection to Chl (Feieraband, 1977;Thomas and Ortiz, 1995). The decrease in Caro concentrations in heat-stressed plants appears counterintuitive, but detection differences may occur as a result of conformational changes in Caro during quenching and heat dissipation (Guerinot, 2000;Kirkpatrick et al, 1999).…”
Section: Resultssupporting
confidence: 82%
See 1 more Smart Citation
“…In this study, the carotenoid concentration was less in the bleaching susceptible cultivar Butterfly, suggesting carotenoid content may play an important role in preventing bleaching in ivy geranium. The decreased Chl a and Caro but increased Chl a:Caro, Chl b:Caro, and total Chl:Caro ratios in 'Butterfly' support previous findings that reduced carotenoid concentrations may not give sufficient protection to Chl (Feieraband, 1977;Thomas and Ortiz, 1995). The decrease in Caro concentrations in heat-stressed plants appears counterintuitive, but detection differences may occur as a result of conformational changes in Caro during quenching and heat dissipation (Guerinot, 2000;Kirkpatrick et al, 1999).…”
Section: Resultssupporting
confidence: 82%
“…Chlorophyll biosynthesis of cucumber (Cucumis sativus) seedlings was reduced to 60% on heat stress as a result of impairment of Chl biosynthetic enzymes compared with normal growth conditions (Tewari and Tripathy, 1998). The decrease in the ratio of Chl a to Chl b is an indicator of heat bleaching in Euglena gracilis (Thomas and Ortiz, 1995). In addition, pheophytin, another Chl, acts as an early electron acceptor in PSII and decreases in concentration inhibit PSII and may indicate heat stress in plants (Groot et al, 1997).…”
mentioning
confidence: 99%
“…Nevertheless, this capacity for acclimation appears limited, as after 24 hrs at 32°C the transcript abundance for both genes was significantly reduced (Figure 3 and 4). A loss of plastid transcripts (including psbA and psaA ) was noted in the green alga, Euglena gracilis , and wheat seedlings ( Triticum aestivum ) during heat stress, contributing to an impairment of protein synthesis [64], [65]. Furthermore, the initial downregulation of both psbA and psaA (Day1 at 32°C; Figure 3) occurred prior to any observed differences in F v /F m (Day 3 at 32°C; Figure 1).…”
Section: Resultsmentioning
confidence: 99%
“…Nuclear‐encoded transcription factors appear to regulate the activity of the plastid‐encoded RNA polymerase (Allison, 2000; Tanaka et al ., 1996), and nuclear‐encoded phage‐type RNA polymerases are involved in the regulation of plastid transcription (Hedtke et al ., 2002). mRNA stability is regulated for fine‐tuning of transcript levels (Barkan and Goldschmidt‐Clermont, 2000; Monde et al ., 2000) during development (Baumgartner et al ., 1993; Klaff and Gruissem, 1991; Rapp et al ., 1992) by either the redox state (Salvador and Klein, 1999), magnesium concentrations (Horlitz and Klaff, 2000), light and endogenous rhythms (Salvador et al ., 1993), heat bleaching (Thomas and Ortiz, 1995), or the cell type (Kubicki et al ., 1994).…”
Section: Introductionmentioning
confidence: 99%