Physiological Study on Sexual Differences in Responseto Nitrogen Stress in Poplar Trees
Poplar tree is a model plant in forestry research.As The representative dioecious plant,poplar plays an important role in physiological,gene expression and derived epigenetic researches from sexual differences.Nitrogen is essential for plant growth and development,however,the mechanisms of nitrogen absorption and assimilation especially the nitrogen use efficiency in two different genders of one plant have not been well studied yet.In this study,a systematical examination of carbon and nitrogen content,photosynthesis efficiency and its parameters,the antioxidant enzyme activities as well as soluble protein and free amino acid concentrations were performed in male and female poplar trees under normal and nitrogen stress conditions.It was found that carbon content increased under nitrogen stress condition,and the female plants were more sensitive than the male plants.Total reactive oxygen species (ROS) concentration was insignificantly different between the male and female plants,but the activities of antioxidant enzymes,such as peroxidase (POD),superoxide dismutase (SOD) and glutathione synthetase (GS),were higher in female individuals than that in male ones.Soluble protein concentrations were similar in the two genders,while the amino acids content varied a lot in male and female individuals under the control and under the nitrogen stress conditions.Aspartic acid (Asp),serine(Ser),as well as arginine (Arg),etc.were higher in male plants under normal condition;most of the free amino acids were suppressed by nitrogen stress except methionine (Met),leucine (Leu) and tyrosine (Tyr),etc.We mainly analyzed physiological difference between the female and male poplar plants under the normal and nitrogen conditions.A and the potential mechanisms were also discussed.
国家科技期刊平台
NSTL
万方数据
维普
