The main biological function of night-time transpiration is the release of respiratory CO2 from leaves. Night-time transpiration is regulated in the short and long term, also under salt stress. Stomata play a key role in this process. We propose to refer, in analogy to water use efficiency (WUE) during the day, to a CO2 release efficiency ('CORE') during the night.
There was an error in Figure 9, panel B: the scale should read 4e+7 and 8e+7 rather than +6. Also, in the Results section, the first sentence of 'Stomatal density' subsection should read: Stomatal density of leaf 2 averaged 3.32 × 10 7 stomata per m 2 of projected leaf surface in plants grown under control conditions (Fig. 9B).
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