Effects of CO2, light and temperature on rubisco activase protein in wheat leaf segments

Herrmann, B.; Hölzer, Regina; Crafts-Brandner, Steven J.; Feller, Urs (1998). Effects of CO2, light and temperature on rubisco activase protein in wheat leaf segments. In: Garab, G (ed.) Photosynthesis: Mechanisms and Effects. Photosynthesis: Mechanisms and Effects: Vol. 3 (pp. 2059-2062). Springer

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Rubisco activase catalyzes the ATP-dependent activation of rubisco. At moderately elevated temperature (for wheat above 30°C), rubisco activase becomes reversibly inactivated in leaf segments (2). A further increase of the temperature (for wheat above 40°C) causes partial insolubilization and the formation of aggregates in less than 30 minutes. Senescence in wheat leaf segments depends on the availability of CO2, the illumination and the incubation temperature. In general, net protein degradation is delayed under CO2 depletion. At higher light (PAR: 150 μmol m-2 s- 1), several stromal proteins are less rapidly degraded than at low light (PAR: 50 μmol m-2 s- 1). In absence of CO2 and at the higher PAR, chloroplast enzymes are maintained in wheat leaf segments over days even at 35°C indicating that senescence and net degradation of chloroplast proteins are not necessarily accelerated by such unfavorable conditions for photosynthesis. The fate of rubisco activase protein under such conditions is of special interest, since its activity is temperature-sensitive and this enzyme plays an important role in the regulation of rubisco activity and as a consequence of the Calvin-cycle.

Item Type:

Book Section (Book Chapter)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant nutrition (discontinued)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Hölzer, Regina and Feller, Urs

Subjects:

500 Science > 580 Plants (Botany)

ISBN:

978-0-7923-5547-2

Series:

Photosynthesis: Mechanisms and Effects

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

30 Jan 2018 11:00

Last Modified:

30 Jan 2018 11:00

Additional Information:

Volume I Proceedings of the XIth International Congress on Photosynthesis, Budapest, Hungary, August 17–22, 1998

BORIS DOI:

10.7892/boris.102073

URI:

https://boris.unibe.ch/id/eprint/102073

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