Adaptive Responses Of Different Picea Species (Europe Spruce) To Drought Stress Under Normal And Low-nitrogen Conditions

Drought stress may occur in many different zones of the world and it's a climatic phenomenon,in the tropical and subtropical zone,drought occurs in high frequency which may result in plant physiological damage,low crop yield,severe case of food scarcity in agricultural sector,but it is severe in forests than in agricultural due to the soil irrigation system in agriculture.It's also affecting several physiological processes by limiting nutrient transport from roots to the shoots.Nitrogen(N)is the most important nutrient for the plant,which plays a critical role in plant growth and metabolism.Picea(Europe Spruce)is one of the most widely distributed trees in America and Europe.Due to the high demand of soil fertility in agriculture resulted from increasing human population in recent years,European spruce often grows on marginal lands.In addition,because of the exuberant secondary growth in European spruce,the sustainable development of picea plantation is not allowed by soil degradation and the lack of nitrogen and phosphorus.In our current study,the adaptive response of picea trees species to the drought stress,well-watered condition under normal nitrogen and low nitrogen treatments have been observed.The two clones of European spruce species were named genotype1 and genotype 2.Our result demonstrated that under combined conditions of normal nitrogen and drought,the quantity of free proline significantly increased in both genotype and malondialdehyde(MDA)has been increased in normal nitrogen treatment but not in low nitrogen treatment.APX content in genotype1 under drought condition with low nitrogen and normal nitrogen treatments were similar.Two treatments with normal nitrogen of both genotypes have been affected by drought condition.In both of genotypes,the quantity of SOD decreased under drought condition in normal nitrogen treatment but not in low nitrogen treatment.Under drought condition,SOD was higher in low nitrogen treatment than normal nitrogen but it did not change under well-watered condition.In conclusions,low nitrogen influenced drought resistance of Picea plant and normal nitrogen enhanced the drought tolerance of these trees.