Lawson, T and Davey, PA and Yates, SA and Bechtold, U and Baeshen, M and Baeshen, N and Mutwakil, MZ and Sabir, J and Baker, NR and Mullineaux, PM (2014) C₃ photosynthesis in the desert plant Rhazya stricta is fully functional at high temperatures and light intensities. New Phytologist, 201 (3). pp. 862-873. DOI https://doi.org/10.1111/nph.12559
Lawson, T and Davey, PA and Yates, SA and Bechtold, U and Baeshen, M and Baeshen, N and Mutwakil, MZ and Sabir, J and Baker, NR and Mullineaux, PM (2014) C₃ photosynthesis in the desert plant Rhazya stricta is fully functional at high temperatures and light intensities. New Phytologist, 201 (3). pp. 862-873. DOI https://doi.org/10.1111/nph.12559
Lawson, T and Davey, PA and Yates, SA and Bechtold, U and Baeshen, M and Baeshen, N and Mutwakil, MZ and Sabir, J and Baker, NR and Mullineaux, PM (2014) C₃ photosynthesis in the desert plant Rhazya stricta is fully functional at high temperatures and light intensities. New Phytologist, 201 (3). pp. 862-873. DOI https://doi.org/10.1111/nph.12559
Abstract
The C₃ plant Rhazya stricta is native to arid desert environment zones, where it experiences daily extremes of heat, light intensity (PAR) and high vapour pressure deficit (VPD). We measured the photosynthetic parameters in R. stricta in its native environment to assess the mechanisms that permit it to survive in these extreme conditions. Infrared gas exchange analysis examined diel changes in assimilation (A), stomatal conductance (g s ) and transpiration (E) on mature leaves of R. stricta. A/c i analysis was used to determine the effect of temperature on carboxylation capacity (V c,max ) and the light- and CO 2 -saturated rate of photosynthesis (A max ). Combined chlorophyll fluorescence and gas exchange light response curve analysis at ambient and low oxygen showed that both carboxylation and oxygenation of Rubisco acted as the major sinks for the end products of electron transport. Physiological analysis in conjunction with gene expression analysis suggested that there are two isoforms of Rubisco activase which may provide an explanation for the ability of R. stricta to maintain Rubisco function at high temperatures. The potential to exploit this ability to cope with extreme temperatures is discussed in the context of future crop improvement. © 2013 New Phytologist Trust.
Item Type: | Article |
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Uncontrolled Keywords: | C3 photosynthesis; heat stress; Rhazya stricta ; Rubisco activase; stomatal conductance; thermotolerance; transpiration |
Subjects: | Q Science > QH Natural history > QH301 Biology |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of Faculty of Science and Health > Computer Science and Electronic Engineering, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 08 Nov 2013 10:14 |
Last Modified: | 30 Oct 2024 19:49 |
URI: | http://repository.essex.ac.uk/id/eprint/8313 |