Responses of H. vulgare L. Seedlings to Basic Salt and Drought under Freeze-thaw Condition

Abstract

Background Qinghai-Tibet Plateau is known for characteristics of high altitude, low rainfall and varying temperature, and the crops in this area are susceptible to abiotic stresses such as drought, basic salt and freeze-thaw that caused damages in different perspectives such as the permeability of biological membrane, osmotic adjustment, and antioxidant enzyme system. Hordeum vulgare L. is an indispensable crop in plateau and plays an important role in agricultural ecosystem as well.Result In this experiment, H. vulgare L. was used as experimental material and the physiological characteristics soluble protein (SP) content, malondialdehyde (MDA) content, antioxidant enzyme activity and relative water content (RWC) of seedlings were examined under freeze-thaw condition combined with drought and alkali stress.Conclusion Research results indicated that under the combined stresses of basic salt and drought, H. vulgare L. seedlings were damaged by lipid peroxidation, weakened superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities, while enhanced osmotic adjustment ability in plants cell. It was suggested that, in agricultural management, the simultaneous occurrence of two stresses, basic salt and drought, should be avoided in the early stage of H. vulgare L. planting to reduce the physiological stress on plants.

Resistance of highland barley seedlings to alkaline salt and freeze-thaw stress with the addition of potassium fulvic acid

“…Under stress, plants produce excessive reactive oxygen radicals, POD and SOD, scavengers of reactive oxygen species (ROS) in plants, which can convert the excess ROS in plants into harmless substances such as water, thus improving the tolerance of plants to various adverse stresses (Sharma et al 2012). The results of single alkaline salt stress were consistent with the research results of Tang et al (2021); this may be owing to that the accumulation of ROS exceeded the regulatory threshold, and the excess ROS cannot be scavenged, thus leading to a decline of antioxidant enzymes activities (Song et al 2006). The addition of potassium fulvic acid could increase POD and SOD activities in leaves under salt stress.…”