Net photosynthetic rate, radiation use efficiency, chlorophyll (Chl) fluorescence, photochemical reflectance index (PRI), and leaf water potential were measured during a 25-<1 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/F m were sensitive to water stress. Ontogenic variations did not exist in Fv/F m 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 FyIF m . PRI showed significant correlation with predawn leaf water potential, Fm', and midday FyIF m . 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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