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Physiological and photosynthetic response of quinoa to drought stress

Fghire, Rachid; Anaya, Fatima; Ali, Oudou Issa; Benlhabib, Ouafae; Ragab, Ragab; Wahbi, Said. 2015 Physiological and photosynthetic response of quinoa to drought stress. Chilean Journal of Agricultural Research, 75 (2). 174-183. https://doi.org/10.4067/S0718-58392015000200006

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Abstract/Summary

Water shortage is a critical problem touching plant growth and yield in semi-arid areas, for instance the Mediterranean región. For this reason was studied the physiological basis of drought tolerance of a new, drought tolerant crop quinoa (Chenopodium quinoa Willd.) tested in Morocco in two successive seasons, subject to four irrigation treatments (100, 50, and 33%ETc, and rainfed). The chlorophyll a fluorescence transients were analyzed by the JIP-test to transíate stress-induced damage in these transients to changes in biophysical parameter's allowing quantification of the energy flow through the photosynthetic apparatus. Drought stress induced a significant decrease in the maximum quantum yield of primary photochemistry (Φpo = Fv/Fm), and the quantum yield of electron transport (Φeo). The amount of active Photosystem II (PSII) reaction centers (RC) per excited cross section (RC/CS) also decreased when exposed to the highest drought stress. The effective antenna size of active RCs (ABS/RC) increased and the effective dissipation per active reaction centers (DIo/RC) increased by increasing drought stress during the growth season in comparison to the control. However the performance index (PI), was a very sensitive indicator of the physiological status of plants. Leaf area index, leaf water potential and stomatal conductance decreased as the drought increased. These results indicate that, in quinoa leaf, JIP-test can be used as a sensitive method for measuring drought stress effects.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.4067/S0718-58392015000200006
CEH Sections/Science Areas: Rees (from October 2014)
ISSN: 0718-5839
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: drought, fluorescence, JIP-test, leaf water potential, quinoa, stomatal conductance
NORA Subject Terms: Ecology and Environment
Hydrology
Agriculture and Soil Science
Botany
Date made live: 13 Aug 2015 13:47 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/511538

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