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Responses of Ottelia alismoides, an aquatic plant with three CCMs, to variable CO2 and light

Shao, Hui; Gontero, Brigitte; Maberly, Stephen C.; Jiang, Hong-Sheng; Cao, Yu; Li, Wei; Huang, Wen-Min. 2017 Responses of Ottelia alismoides, an aquatic plant with three CCMs, to variable CO2 and light. Journal of Experimental Botany, 68 (14). 3985-3995. 10.1093/jxb/erx064

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Abstract/Summary

Ottelia alismoides is a constitutive C4 plant and bicarbonate user, and has facultative crassulacean acid metabolism (CAM) at low CO2. Acclimation to a factorial combination of light and CO2 showed that the ratio of phosphoenolpyruvate carboxylase (PEPC) to ribulose-bisphosphate carboxylase/oxygenase (Rubisco) (>5) is in the range of that of C4 plants. This and short-term response experiments showed that the activity of PEPC and pyruvate phosphate dikinase (PPDK) was high even at the end of the night, consistent with night-time acid accumulation and daytime carbon fixation. The diel acidity change was maximal at high light and low CO2 at 17–25 µequiv g−1 FW. Decarboxylation proceeded at ~2–3 µequiv g−1 FW h−1, starting at the beginning of the photoperiod, but did not occur at high CO2; the rate was greater at high, compared with low light. There was an inverse relationship between starch formation and acidity loss. Acidity changes account for up to 21% of starch production and stimulate early morning photosynthesis, but night-time accumulation of acid traps <6% of respiratory carbon release. Ottelia alismoides is the only known species to operate CAM and C4 in the same tissue, and one of only two known aquatic species to operate CAM and bicarbonate use.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1093/jxb/erx064
CEH Sections: Parr
ISSN: 0022-0957
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: aquatic plant, C4, CAM, CCMs, PEPC, photosynthesis, PPDK, Rubisco, starch
NORA Subject Terms: Botany
Date made live: 21 Sep 2017 10:49 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/517815

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