Indrakant K Singh1, Archana Singh2, Pratishtha Rai3, Irengbam Rocky Mangangcha1
1Deshbandhu College, University of Delhi, New Delhi, India.
2Hans Raj College, University of Delhi, New Delhi, India.
3CCS University, Meerut (U.P.), India.
Exposure to radiation disrupts the cellular homeostasis and enhances the production of reactive oxygen intermediates (ROIs) in cells which can even lead to death. There is a wide range over which organisms are sensitive to the lethal effects of radiation. Several antioxidant enzymes and a network of antioxidants are known to protect the cells from radiation-induced oxidative stress. In this study, we predict that lower plants (Algae and Pteridophyte) are more tolerant to radiation stress as compared to higher plants (Flowering plants: Monocots and Dicots) on the basis of higher mitochondrial localization potential and coexistence of important antioxidant enzymes in Chlamydomonas reinhardtii and Selaginella moellendorffii as compared to higher plants (Triticum aestivum, Oryzae sativa, Arabidopsis thaliana, and Medicago truncatula). A higher mitochondrial localization potential as a function of mitoprot score was evident for all important antioxidant enzymes in the algae, Chlamydomonas reinhardtii (Mn-SOD, 0.8168; GPx, 0.9983; TRPx, 0.9989; TR, 0.9233; Gpx, 0.9983; GST, 0.9982; GR, 0.9241; AscPx, 0.9958), Further, we compared the status of plants with other known radio-sensitive (mammals) and radio-resistant (insects) group which suggested that lower plants have maximum mitoprot score for antioxidant enzymes helping in minimizing the free radical mediated damage to mitochondria. Read more…