title: Changes in photosynthetic pigments and chlorophyll-a fluorescence attributes of sweet-forage and grain sorghum cultivars under salt stress.
abstract: Water shortage leads to a low quality of water, especially saline water in most parts of agricultural regions. This experiment was designed to determine the effects of saline irrigation on sorghum as a moderately salt-tolerant crop. To study salinity effects on photosynthetic pigment attributes including the chlorophyll content and chlorophyll fluorescence, an experiment was performed in a climate-controlled greenhouse at two vegetative and reproductive stages. The experimental design was factorial based on a completely randomized design with five NaCl concentrations (control, 50, 100, 150, and 200 mM), two grain and sweet-forage sorghum cultivars (Kimia and Pegah, respectively) and four replications. According to the experimental data, there were no significant differences between two grain and sweet-forage cultivars. Except for 100 and 150 mM NaCl, salinity significantly decreased the chlorophyll index and pigment contents of the leaf, while it increased the chlorophyll-a fluorescence characteristics. Although salinity reduced photosynthetic pigments and the crop yield, either grain or sweet-forage cultivars could significantly control the effect of salinity between 100 and 150 mM NaCl at both developmental stages, showing the possibility of using saline water in sorghum cultivation up to 150 mM NaCl.
authors: Department of Agronomy and Plant Breeding, College of Agriculture and Natural Resources, University of Tehran, PO Box 4111, Karaj, Iran. p_sayyad_amin@ut.ac.ir.
authors: Parvaneh
authors: P
authors: Sayyad-Amin
authors: Department of Agronomy and Plant Breeding, College of Agriculture and Natural Resources, University of Tehran, PO Box 4111, Karaj, Iran.
authors: Mohammad-Reza
authors: MR
authors: Jahansooz
authors: Agricultural Research School, Nuclear Science and Technology Research Institute, PO Box 31485/498, Karaj, Iran.
authors: Azam
authors: A
authors: Borzouei
authors: Agricultural Research School, Nuclear Science and Technology Research Institute, PO Box 31485/498, Karaj, Iran.
authors: Fatemeh
authors: F
authors: Ajili
mesh_terms: D002734:Chlorophyll / Q000378:metabolism*; D000077194:Chlorophyll A; D004734:Energy Metabolism / Q000187:drug effects; D010788:Photosynthesis / Q000187:drug effects*; D010860:Pigments, Biological / Q000378:metabolism*; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D054712:Salinity; D012492:Salts / Q000494:pharmacology*; D045868:Sorghum / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D010860:Pigments, Biological; D012492:Salts; D002734:Chlorophyll; D000077194:Chlorophyll A
keywords: Carotenoid; Chlorophyll; Fluorescence; Pigment; Salinity; Sorghum