Excitation Pressure Regulates Variegation in the immutans Mutant of Arabidopsis thaliana View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2008

AUTHORS

Dominic Rosso , Diego Saccon , Lori Schillaci , Shelly Wang , Wenze Li , Steven R. Rodermel , Denis P. Maxwell , Norman P. A. Huner

ABSTRACT

Excitation pressure, measured by chlorophyll fluorescence as 1-qP, is an estimate of the redox state of the PQ pool and can be modulated by both light and temperature. We hypothesized that the redox state of the PQ pool regulates the extent of variegation in immutans. To test this hypothesis, immutans was grown at either 25°C or 12°C with increasing light intensities of 50, 150 and 450 μmol photons m−2 s−1 under either a short day photoperiod (8/16 day/night) or under continuous light. An imaging technique was developed to quantify the kinetics of leaf variegation with concomitant measurements of excitation pressure during steady-state photosynthesis. As the growth light intensity increased at 25°C, the extent of variegation increased from no detectable variegation at 50 μmol photons m−2 s−1 to a maximum of 59% variegation at 450 μmol photons m−2 s−1. In contrast, immutans grown at 12°C exhibited significant variegation even when grown at low light under either a short day photoperiod or continuous light conditions. Since the development of white sectors was correlated with excitation pressure, we conclude that the redox state of the PQ pool regulates the extent of variegation. More... »

PAGES

1115-1119

Book

TITLE

Photosynthesis. Energy from the Sun

ISBN

978-1-4020-6707-5
978-1-4020-6709-9

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4020-6709-9_244

DOI

http://dx.doi.org/10.1007/978-1-4020-6709-9_244

DIMENSIONS

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