Ascorbic acid and Proline alleviat the adverse effects of salinity stress in Duranta erecta L. var. Variegata plants

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Abstract The present study was carried out at the Faculty of Desert Agriculture and Environmental in Fouka, Matrouh University (Matrouh governorate) Egypt, during the two successive seasons of 2019/2020 and 2020/2021. This investigatin aimed to study the effects of ascorbic acid (0.0, 100, 200 ppm) and proline (0.0, 40, 80 ppm) on alleviating the adverse effects of salinity stress at 0.0, 2000, 4000, 6000 ppm seawater in Duranta erecta L. var. Variegata plants. The experiment was designed in a split-plot design in random completely block design (RCBD) with three replications. In this experiment, the main plot was salt water levels and the sub-plot was spraying by proline and ascorbic acid treatments. The results showed that treated plants with proline at 80 ppm and ascorbic acid at 200ppm enhanced plant height, leaves dry weight, leaf green color degree (SPAD units), plant survival percentage, stomata measurement, potassium of leaves and antioxidant such as superoxide dismutase (SOD), catalase (CAT), reduced glutathione (GSH), cytochrome b5, cytochrome P450 (CYP450), amidopyrine N-demethylase and aniline 4-hydroxylase activity. Moreover, treatments deacreased thiobarbituric acid reactive substances (TBARS), sodium and chlorid. Finaly, proline and ascorbic acid alleviate the negative effects of salinity and increase Duranta plant growth and plant survival percentage by inhancing the antioxidant enzymes, potassium cations and photosynthetic system, decresing DNA breakage %, harmful ions eg:sodium and chloride.

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