Mechanisms of Enhancing Photosynthetic Gas Exchange in Date Palm Seedlings (Phoenix dactylifera L.) under Salinity Stress by a 5-Aminolevulinic Acid-based Fertilizer

NaCl salinity-induced changes in water status, ion contents and photosynthetic properties of Shepherdia argentea (Pursh) Nutt. seedlings

“…Most studies show that salinity adversely affects Chl content (Meloni et al 2003). The observed decrease in Chl contents in the leaves of S. argentea seedlings grown under saline conditions (Table 1) may be attributed to both an inhibited synthesis of that pigment and damaged PS antenna system (Youssef and Awad 2008). The higher Chl a/b ratio in 600 mmol/l salt-treated plants compared to that in other treatments obtained in this study (Table 1) indicates that the ratio of PS 2/PS 1 content was changed in stressed leaves under severe salinity level (Stępień and Kłbus 2006).…”

“…There are increasing evidences that salt affects photosynthetic NaCl salinity-induced changes in water status, ion contents and photosynthetic properties of Shepherdia argentea (Pursh) Nutt. seedlings enzymes, chlorophylls and carotenoids (Misra et al 1997, Youssef andAwad 2008). It has also been observed by Biswal et al (2002) that NaCl salinity affects photosystem 2 (PS 2) photochemical efficiency, charge separation of primary charge pairs in PSII and pigment-protein complexes of thylakoid membranes.…”

Promotive effects of 5-Aminolevulinic acid on growth, photosynthetic gas exchange, chlorophyll, and antioxidative enzymes under salinity stress in Prunnus persica (L.) Batseh Seedling

“…Osmoregulation in cells increases. Hence, the leakage of electrolytes through the membrane is reduced and the integrity of the membrane is maintained (Youssef and Awad, 2008;Yang et al, 2014).…”

“…Environmental stresses, such as high salinity, adversely affect plant growth and productivity (Youssef and Awad, 2008;Van-Ha et al, 2014). The rate of photosynthesis in plants decreases because of ion toxicity, osmotic stress, and hyponutrition under salinity stress; as a result, plant growth is inhibited and senescence is accelerated (Chaves et al, 2009).…”

Impact of Salinity Stress on Date Palm (Phoenix dactylifera L) – A Review

“…It can be recommended that date palm plants of certain varieties can be irrigated with saline water during vegetative growth. Youssef and Awad (2008) conducted a study to enhance photosynthetic gas exchange in date palm seedlings under salinity stress (subjected to seawater treatments at 1-, 15-, and 30-mS cm -1 ) using a 5-Aminolevulinic Acid-based fertilizer. They found that date palm seedlings accumulated significant amounts of Na+ in the foliage with increasing salinity, about a threefold increase in the accumulated Na+ between the control and 30 mS cm −1 salinity treatment.…”