Reactive Nitrogen Species and Nitric Oxide -- Functional Role of Nitric Oxide under Abiotic Stress Conditions -- Nitric Oxide and Abiotic Stress Induced Oxidative Stress -- Regulatory Role of Nitric Oxide in Alterations of Morphological Features of Plants under Abiotic Stress -- Nitric Oxide and High Temperature Stress: A Physiological Perspective -- Nitric Oxide in Drought Stress Signaling and Tolerance in Plants -- Nitric Oxide and Plant Hemoglobins Improve the Tolerance of Plants to Hypoxia -- Nitric Oxide as a Mediator of Cold Stress Response: a Transcriptional Point of View -- Nitric Oxide and UV-B Radiation -- Nitric Oxide Impact on Plant Adaptation to Transition Metal Stress -- Nitric Oxide Action in the Improvement of Plant Tolerance to Nutritional Stress -- Role of Nitric Oxide in Heavy Metal Stress -- Role of Nitric Oxide in Salt Stress-induced Programmed Cell Death and Defense Mechanisms -- Nitric Oxide and Postharvest Stress of Fruits, Vegetables and Ornamentals -- Insights into the Participation of Nitric Oxide and Extra Cellular ATP in Wounding.