- Cukriniai runkeliai
Flavonoids in leaves
Glycosylated bioflavonoids prevents plant leaves from long-term visible light inducing oxidative damage. It is believed that quercetin derivatives may protect the plant membrane shell situated in chloroplasts from visible light-induced by the single oxygen generation Therefore, glycosylated natural antioxidants commonly found in plant leaves foster healthy cells. These characteristics, and the biosynthesis of antioxidant bioflavonoids increase both at low levels, as well as high levels of illumination (light radiation) as a response to depletion of nitrogen in plants. Glycosylated flavonoid accumulation increases, not only for the plant exposed to UV - B (315-280 nm) radiation, but also increases in a stress situation and other environmental influences, such as the root zone salinity. Foto oxygen stress in plants occurs due to the formation of reactive oxygen species. Natural antioxidants are able to neutralize adverse effects of reactive oxygen species, by absorbing ultraviolet solar radiation, as well as in complex with iron and copper ions. Bioflavonoids, without the ability to protect the leaves from photo oxidative stress, as well as helps the plant to survive from exposure to different stressful environmental influences, such as drought, high ambient temperatures and, environmental pollution. By summarizing, it can be said that flavonoids are important to improve the tolerance of the plant both in biotic and abiotic stress situations.
In addition, flavonoids; have primary antioxidant functions in response to various abiotic stress in plants. They are effective as auxin endogenic motion controllers, and can perform the role of plant development regulators. Bioflavonoids are able to control the individual plant organs and development of the whole plant. Thus, natural antioxidants contribute to stress-induced morphogenic responses in plants. Summarizing, we can say that flavonoids kindle effectively control the development processes of eukaryotic cells.
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