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- W2624646351 abstract "Summary Optimal stomatal theory is an evolutionary model proposing that leaves trade-off Carbon (C) for water to maximise C assimilation ( A ) and minimise transpiration ( E ), thereby generating a marginal water cost of carbon gain (λ) that remains constant over short temporal scales. The circadian clock is a molecular timer of metabolism that controls A and stomatal conductance ( g s ), amongst other processes, in a broad array of plant species. Here, we test whether circadian regulation contributes towards achieving optimal stomatal behaviour. We subjected bean ( Phaseolus vulgaris ) and cotton ( Gossypium hirsutum ) canopies to fixed, continuous environmental conditions of photosynthetically active radiation, temperature and vapour pressure deficit over 48 hours. We observed a significant and self-sustained circadian oscillation in A and in stomatal conductance ( g s ) which also led to a circadian oscillation in λ . The lack of constant marginal water cost indicates that circadian regulation does not directly lead to optimal stomatal behaviour. However, the temporal pattern in gas exchange, indicative of either maximizing A or of minimizing E , depending upon time of day, indicates that circadian regulation could contribute towards optimizing stomatal responses. More broadly, our results add to the emerging field of plant circadian ecology and show that molecular controls may partially explain leaf-level patterns observed in the field." @default.
- W2624646351 created "2017-06-15" @default.
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- W2624646351 date "2017-06-06" @default.
- W2624646351 modified "2023-10-14" @default.
- W2624646351 title "Does circadian regulation lead to optimal gas exchange regulation?" @default.
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- W2624646351 doi "https://doi.org/10.1101/121368" @default.
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