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Rubisco Catalytic Properties and Temperature Response in Crops1
Variability in Rubisco kinetic parameters and their temperature dependency demonstrate differences in photosynthetic efficiency in the most important crops worldwide. Rubisco catalytic traits and their thermal dependence are two major factors limiting the CO 2 assimilation potential of plants. In th...
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| Published in: | Plant physiology (Bethesda) 2016-06, Vol.171 (4), p.2549-2561 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | Variability in Rubisco kinetic parameters and their temperature dependency demonstrate differences in photosynthetic efficiency in the most important crops worldwide.
Rubisco catalytic traits and their thermal dependence are two major factors limiting the CO
2
assimilation potential of plants. In this study, we present the profile of Rubisco kinetics for 20 crop species at three different temperatures. The results largely confirmed the existence of significant variation in the Rubisco kinetics among species. Although some of the species tended to present Rubisco with higher thermal sensitivity (e.g.
Oryza sativa
) than others (e.g.
Lactuca sativa
), interspecific differences depended on the kinetic parameter. Comparing the temperature response of the different kinetic parameters, the Rubisco
K
m
for CO
2
presented higher energy of activation than the maximum carboxylation rate and the CO
2
compensation point in the absence of mitochondrial respiration. The analysis of the Rubisco large subunit sequence revealed the existence of some sites under adaptive evolution in branches with specific kinetic traits. Because Rubisco kinetics and their temperature dependency were species specific, they largely affected the assimilation potential of Rubisco from the different crops, especially under those conditions (i.e. low CO
2
availability at the site of carboxylation and high temperature) inducing Rubisco-limited photosynthesis. As an example, at 25°C, Rubisco from
Hordeum vulgare
and
Glycine max
presented, respectively, the highest and lowest potential for CO
2
assimilation at both high and low chloroplastic CO
2
concentrations. In our opinion, this information is relevant to improve photosynthesis models and should be considered in future attempts to design more efficient Rubiscos. |
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| ISSN: | 0032-0889 1532-2548 |
| DOI: | 10.1104/pp.16.01846 |