PJB-2019-511
EFFECT OF SEASONAL VARIATIONS ON ANTIOXIDANT COMPOUNDS AND THEIR ROLE IN THE ADAPTATION OF SOME HALOPHYTES AT WADI GHARANDAL, SOUTHWEST SINAI.
Mohamed M. Abd El-Maboud
Abstract
The impact of seasonal variations on lipid peroxidation in terms of malondialdehyde (MDA) content, and contents of carotenoid, ascorbic acid content, proline content, glycine betaine content and total phenols content were assessed in seven halophytic representative species, viz., the shoot system of Halocnemum strobilaceum (Pall.), Arthrocnemum macrostachyum (Moric.), Suaeda vermiculata (Forssk.), Atriplex halimus (L.), Zygophyllum album (L.), Tammarix nilotica (Ehrenb.) and Limonium pruinosum (L.). Lipid peroxidation and glycine-betaine increased in summer, while carotenoids and proline decreased in all the species studied. During winter, the ascorbic acid content increased in all species, except in L. pruinosum, while total phenols content increased during summer except in Z. album. Positive correlations were recorded among carotenoids with ascorbic acid, proline and total phenols and also proline content with total phenols in the first four species belongs to Amaranthaceae. These results indicate that glycine betaine biosynthesis play a pivotal role in diluting the deleterious effects result in abiotic stress, especially in Amaranthaceae.
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