油茶对低磷胁迫的生理生化效应研究

P是植物生长发育不可缺少的营养元素之一,它参与植物细胞膜磷脂的组成、光合磷酸化和氧化磷酸化中P的循环、能量的形成等生理生化过程,与植物体内糖类、蛋白质和脂类的代谢和三者相互转变都有密切的关系1-2].P作为限制植物生长的障碍因子也已经越来越受到人们的重视3-4].不同类型植物利用土壤P素的能力不同5],近年来,如何充分挖掘植物自身潜力来提高P的利用效率已成为研究的焦点.

Study on Physiological and Biochemical Responses of Camellia oleifera to Low Phosphorus Stress

The physiological and biochemical responses of Camellia oleifera to low phosphorus stress were investigated in this study, and the different phosphorus concentrations of the treatments were conducted by using a single factor experiment with water culture in the greenhouse. Results showed that the activity of APA in leaves tissues and those secreted by the roots all increased under P deficiency, which respectively increased by 16.49% - 86.47% and 28.7% - 58.7% compared with those of the control. The increase of APA may be an active adaptive response of Camellia oleifera to low phosphorus stress.Under the situation of low phosphorus stress, the concentrations of soluble sugar and free proline increased whereas the soluble protein decreased,those showed that normal protein synthesis and carbohydrate metabolism were blocked under the situation of low phosphorus stress; Moreover, the homeostasis established by the increase of MDA concent and protective enzyme (SOD) activity in leaves was the mechanism of the adaptive response for Camellia oleifera to low phosphorus stress.