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Scientific article
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English

The herbicide-resistant D1 mutant L275F of Chlamydomonas reinhardtii fails to show the bicarbonate-reversible formate effect on chlorophyll a fluorescence transients

Published inPhotosynthesis Research, vol. 27, p. 199-208
Publication date1991
Abstract

Herbicide-resistant mutants of the eukaryotic green alga Chlamydomonas reinhardtii, that are altered in specific amino acids in their D-1 protein, show differential bicarbonate-reversible formate effects. These results suggest the involvement of D1 protein in the ‘bicarbonate effect'. A 25 mM formate treatment of mixotrophically or photoautotrophically grown wild type cells results in a slower rise of chlorophyll a fluorescence transient followed by a dramatically slowed decline during measurements in continuous light. These effects are fully reversed upon addition of 10 mM bicarbonate. The mutant BR-202 [L275F] is, however, highly insensitive to 25 mM formate suggesting that a significant change in formate (bicarbonate) binding has occurred in helix V of the D1 protein near histidine involved in Fe binding. With the exception of DCMU-4 [S264A], which is considerably more sensitive to formate than the wild type, five other different [V219I, A25IV, F255Y, G256D and cell-wall deficient CW-15] mutants display a relatively similar response to formate as wild type. Absence of formate effect on a PS II-lacking [FuD-7] mutant confirms the sole involvement of PS II in the ‘bicarbonate effect'.

Keywords
  • Photosystem II
  • Herbicides
  • Mutants
  • D-1 protein
  • Bicarbonate
  • Chlamydomonas reinhardtii
Funding
  • Swiss National Science Foundation - 31.26345.89
  • Swiss National Science Foundation - 31-27799.89
Citation (ISO format)
GOVINDJEE, - et al. The herbicide-resistant D1 mutant L275F of <i>Chlamydomonas reinhardtii</i> fails to show the bicarbonate-reversible formate effect on chlorophyll <i>a</i> fluorescence transients. In: Photosynthesis Research, 1991, vol. 27, p. 199–208. doi: 10.1007/BF00035841
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Article (Published version)
Identifiers
ISSN of the journal0166-8595
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