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Publication Type J
Authors Ben-Halima, E., N. Farhat, A. Elkhouni, R. Hidri, K. Hessini, A. Smaoui, C. Abdelly and M. Rabhi
Title Chlorophyll fluorescence responses to short-term drought in Mesembryanthemum nodiflorum
Source Agrochimica
Language English
Author Keywords CAM D1 energy distribution halophyte PSII photochemistry crassulacean acid metabolism water-deficit a fluorescence stress leaves maize photoprotection photosynthesis mechanisms parameters Chemistry Agriculture
Abstract The halophyte Mesembryanthemum nodiflorum (Aizoaceae) was reported to shift its photosynthetic pathway from C3 to CAM under drought conditions. The aim of the present work was to test whether its photosynthetic apparatus is drought-sensitive. Plants were grown for 7 days on a nutrient medium added (drought) or not (control) with 10% polyethylene glycol (PEG) 6000. Growth and root water content of stressed plants were not affected, whereas their shoot water status and pigment concentrations were markedly affected. This was probably due to D1 damage as proved by the increased minimal fluorescence (F-0) and the unchanged maximal one (F-m). Photosystem II (PSII) energy distribution revealed a decrease in photochemical process and an increase in the non-regulated non-photochemical quenching, the regulated non-photochemical quenching being unchanged. This sensitivity of the photosynthetic machinery of M. nodiflorum to drought may explain why this species shifts its photosynthetic pathway from C3 to CAM under such conditions.
Author Address [Ben-Halima, E.; Farhat, N.; Elkhouni, A.; Hidri, R.; Hessini, K.; Smaoui, A.; Abdelly, C.; Rabhi, M.] Ctr Biotechnol Borj Cedria, Lab Extremophile Plants, POB 901, Hammam Lif 2050, Tunisia. Farhat, N (reprint author), Ctr Biotechnol Borj Cedria, Lab Extremophile Plants, POB 901, Hammam Lif 2050, Tunisia. nejiafarhat@gmail.com
ISSN 0002-1857
ISBN 0002-1857
29-Character Source Abbreviation Agrochimica
Publication Date Apr-Jun
Year Published 2018
Volume 62
Issue 2
Beginning Page 167-177
Digital Object Identifier (DOI) 10.12871/00021857201826
Unique Article Identifier WOS:000445976900006
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