Amelioration of Hypothermia-Induced Damage on Peanut by Exogenous Application of Chitooligosaccharide

Low temperature is the most common abiotic stress factor in peanut cultivation. Chitooligosaccharide (COS) plays an important role low-temperature resistance plants, however, of COS regulating cold tolerance peanuts not clear. This research investigated effects exogenous on seedlings response to low temperatures. The results showed that can significantly alleviate cooling symptoms by reducing content malondialdehyde (MDA) and reactive oxygen species (ROS) under simulated conditions (8 °C). These reductions may be related elevation superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) polyphenoloxidase (PPO) activities increased contents osmotic substances such as soluble sugars (SS), protein (SP), proline (Pro), total phenols (TP) compared with those untreated seedlings. Meanwhile, chlorophyll a b leaf also increased, well net photosynthetic rate (Pn), resulted plant height, heavier fresh weight, dry weight. Notably, treatment 100 mg·L−1 had maximum gain other treatments. In summary, this study revealed usage for chilling alleviation, mg L−1 foliar spraying recommended.