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Oxidative stress is a disturbance in the antioxidant balance leading to cellular damage. Reactive oxygen species (ROS) and especially hydrogen peroxide are the major contributor to the onset of oxidative stress in biological systems. Oxidation of cellular lipids, proteins, and DNA by ROS decreases cellular function and increases susceptibility to chronic diseases. Nonetheless, a relationship between reactive oxygen species metabolism and dormancy breaking in plant has been previously reported. Application of hydrogen peroxide or of catalase inhibitors (such thiourea) releases dormancy in...

Dormancy is one aspect of tuber physiological age that begins with potato tuber initiation. During dormancy, proteomic and physiological processes do happen but they do not lead to immediate morphological changes. But these processes are relevant for the number of sprouts produced after breaking of the dormancy and for the growth vigour of the seed tuber. This review propose that dormancy phasis is a complex process that depends mainly on genetic background, stage of tuber development, environmental and management conditions during tuber growth and storage, it also depends of mother tuber. In...

Growth of hot pepper under saline conditions can be best evaluated by the relative growth rate, relative leaf water contents and carotenoids levels. Moreover, under salt stress, reduced pepper plant growth is primarily due to osmotic stress rather than ionic toxicity, because pepper is regarded as Na+ excluder. Furthermore, carotenoid contents can be used to screen hot pepper germplasm for salt tolerance. It is suggested that use of landraces could be more appropriate than the wild species because indigenous germplasm has potential to perform better than the exotic cultivars due to their...