Role of Tocopherol (Vitamin E) in Plants: Abiotic Stress Tolerance and Beyond

摘要: To cope with oxidative stress, plants have developed well-organized antioxidant defense systems, where tocopherol (Toc) is a countable nonenzymatic that synthesized in the plastid of photosynthesizing organisms. In plants, four different types Toc are found, including alpha (α), beta (β), gamma (γ), and delta (δ)-Toc. However, α-Toc most common form found photosynthetic tissue. The accumulation varies greatly plant species parts as well. Tocopherols diversified roles growth physiological processes can also affect yield. Due to its activity, plays vital role conferring tolerance several abiotic stresses (e.g., salinity, drought, metal toxicity, ozone, UV radiation). Several reports indicate stress-tolerant exhibit an enhanced level Toc, whereas sensitive ones show decreased under stressful conditions leading damage. important mitigating stress-induced damage ability scavenge or quench lipid peroxides, oxygen radicals, singlet oxygen, resulting detoxification reactive species. Tocopherol works coordination other antioxidants ascorbate) interacts phytohormones such ethylene, abscisic acid, salicylic jasmonic acid. Although considerable number studies been done explore stress tolerance, there still many gaps grasping basic mechanisms through which confers tolerance. This chapter provides comprehensive analysis recent on biosynthesis growth, physiology,