Abstract
Effect of cold on antioxidant responses in aerial (shoots and leaves) and roots tissues of two contrasting accessions of M. ciliaris Krockers (Cil 126, tolerant and Cil 123, sensible) were investigated. Ten-day-old grown seedlings were subjected at different periods of cold acclimation (4°C) 2, 4, and 6 days. Peroxidases (POD) (EC 1.11.1.7) activities and isoenzymes expression of plantlets treated and control (23°C) of the aerial (shoot+leaves) and root vegetative tissues were carried. Global peroxidase activity under low temperature stress was higher in tolerant ecotype than sensible one. The same trend was also observed at expressed isoenzymes. On the other hand, whether in tolerant or sensitive, activity and isoenzymes peroxidase was more pronounced at the roots than in aerials tissues system.
Highlights
Cold stress is one of the major factors limiting agricultural productivity, the plants evolved a numerous adaptive responses to cope with environmental stresses
The biochemical changes observed in our study during cold stress in both vegetative tissues has been demonstrated in many species and under many stresses
Ghosh and Xu (2014) reported that proteomic analyses of plant roots under various abiotic stress conditions revealed important information on proteins involved in the abiotic stress response
Summary
Cold stress is one of the major factors limiting agricultural productivity, the plants evolved a numerous adaptive responses to cope with environmental stresses. Root absorbs water and nutrients from the soil and supplies them throughout the plant body, ensuring a cellular homeostasis balance. This cellular homeostasis altered during the stress period when roots tissues are forced to adopt several structural and functional modifications. Under cold stress a significant amount of reactive oxygen species (ROS) is produced, such as hydrogen peroxide (H2O2) and other dangerous derivatives oxygen, which cause progressive oxidative damage and as consequence cell death (Mohammadian et al, 2012). Antioxidant enzyme activities in plants are accepted as a good indicator of tolerance under stress conditions (Öklen et al, 2008)
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