دكتوراه
د. عبد الكريم عياش
- هيئة تدريسية
EFFECTS OF ULTRAVIOLET-B RADIATION IN PLANT PHYSIOLOGY
The Journal of National Agricultural and Food Centre / 11 - مارس - 2021
Over the past few decades, anthropogenic activities contributed to the depletion of the ozone layer, which increased the levels of solar ultraviolet-B (UV-B) radiation reaching the Earth`s surface. Generally, UV-B is harmful to all living organisms. It damages the cell`s Deoxyribonucleic acid (DNA), proteins, and lipids, and as a consequence, it affects the bio-membranes negatively. In this review, we summarize the major effects of UV-B in the plant`s main molecules and physiological reactions, in addition to the possible defence mechanisms against UV-B including accumulating UV-B absorbing pigments to alleviate the harmful impact of UV-B.
تحميل الملفAnthocyanin pigments: Structure and biological importance
Journal of Chemical and Pharmaceutical Sciences / 1 - ديسمبر - 2020
Anthocyanins are coloured water-soluble pigments representing one of the major subclasses of compounds. They rarely exist in nature as free aglycons, instead, they attach to one or more sugar moieties. Anthocyanins are found within different plant organs; flowers, leaves, fruits, roots, tubers and grains. They appear in different attractive colours depending on their structure, pH, and other factors. These compounds gained a lot of attention in the last few years as food colourants replacing chemical dyes, besides their role in enhancing plant tolerance against many abiotic stresses such as salinity, drought, excessive light, ultraviolet radiation and cold stress. Besides, previous studies demonstrated the importance of anthocyanins in human health and their protective properties against chronic diseases.
تحميل الملف