Ecophysioloical Responses Of Sea Buckthorn (Hippophae Rhamnoides L.) To Low Temperature And Enhanced UV-B Radiation

Plant is adversely affected by various abiotic and biotic stress factors. These stressors include low temperature, heat, salt, drought, flooding, heavy metal toxicity, wounding by herbivores, infecting by pathogenic microorganisms, ultraviolet (UV) radiation and so on. Various anthropogenic activities have accentuated the existing stress factors. One of the most important aspects of global change is that of stratospheric ozone depletion caused by serious anthropogenic pollution and the resulting increase in UV radiation reaching the surface of the Earth. Scientists have become concerned about the effects that considerable UV-B stress, even at current levels.In order to survive and reproduce, plants have to be able to cope with lots of potentially harmful stress factors that are almost constantly present in their environment. Most plants' responses under stress are to neutralize the stress, repairing the damage or regrowing new tissue rather than to avoid it due to their sessile life style. The plant defense capacity depends on plant-specific modular growth patterns and genetic make-up that allows for flexible responses to changing environments. Plants usually encounter several stresses simultaneously under field conditions, and the stresses may cause a variety of plant responses, which can be additive, synergistic or antagonistic.Sea buckthorn (Hippophae rhamnoides L.), a thorny nitrogen fixing deciduously perennial shrub, which is widely distributed throughout the temperate zones of Asia and Europe and the subtropical zones of Asia at high altitudes. It has been widely used in forest restoration as the pioneer species in China. In this paper, we used sea buckthorn as a model, tried to get some...