Abstract
Net photosynthetic rate, radiation use efficiency, chlorophyll (Chl) fluorescence, photochemical reflectance index (PRI), and leaf water potential were measured during a 25-d period of progressive water deficit in quinoa plants grown in a glasshouse in order to examine effects of water stress and ontogeny. All physiological parameters except Fv/Fm were sensitive to water stress. Ontogenic variations did not exist in Fv/Fm and leaf water potential, and were moderate to high in the other parameters. The complete recovery of photosynthetic parameters after re-irrigation was related with the stability in Fv/Fm. PRI showed significant correlation with predawn leaf water potential, Fm′, and midday Fv/Fm. Thus PRI and Chl fluorescence may help in assessing physiological changes in quinoa plants across different developmental stages and water status.
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Winkel, T., Méthy, M. & Thénot, F. Radiation Use Efficiency, Chlorophyll Fluorescence, and Reflectance Indices Associated with Ontogenic Changes in Water-Limited Chenopodium quinoa Leaves. Photosynthetica 40, 227–232 (2002). https://doi.org/10.1023/A:1021345724248
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DOI: https://doi.org/10.1023/A:1021345724248