Regulation of chlorophyll biosynthesis and degradation by salt stress in sunflower leaves

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Photosynthesis under stressful environments: An overview (2013, background): “A series of experiments with sunflower callus and plants (Santos and Caldeira 1999, Santos et al. 2001, Santos 2004, Akram and Ashraf 2011) have shown that the important precursors of Chl, i.e., glutamate and 5-aminolaevulinic acid (ALA), decreased in salt-stressed calli and leaves, which indicates…”
Growth and Physiological Responses of Landscape Plants to Saline Water Irrigation: A Review (2010, background): “Salt stress not only causes leaf scorching and necrosis, but chlorosis as well, because it has been shown that low to moderate salinity stimulates chlorophyll degradation, whereas higher salt concentrations more drastically affect chlorophyll synthesis (Santos, 2004).”
Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato (2015, background): “The decrease in chlorophyll levels in plants affected by salt is due to the inhibition of chlorophyll synthesis, together with the activation of its degradation by the enzyme chlorophyllase (Santos, 2004).”
Alleviation of salinity stress on Vicia faba L. plants via seed priming with melatonin (2014, background): “In addition, Santos (2004) pointed out that the decrease in chlorophyll content in severely NaCl stressed leaves was mainly due to a decrease of ALA (5-aminolinolic acid) synthesis.”