磷对草莓体内Cd化学形态及生理特性的影响

Effect of Phosphorus on Chemical Forms and Physiological Properties of Cadmium in Fragaia ananassa D.

采用盆栽试验研究了不同重金属Cd（5、10、20mgkg-1）污染下，叶面喷施0．5％的磷对草莓生长、叶绿素、类胡萝卜素、丙二醛（MDA）含量及草莓体内Cd形态的影响。结果表明，叶面喷施磷提高了草莓体内叶绿素含量、类胡萝卜素含量，降低了MDA含量。草莓地上部分中Cd的形态以氯化钠提取态〉醋酸提取态〉乙醇提取态〉残渣态〉盐酸提取态〉去离子水提取态。与对照相比，喷磷明显降低了草莓中氯化钠提取态、去离子水提取态、盐酸态及Cd提取总量。叶片喷磷处理后氯化钠提取态、去离子水提取态和盐酸态Cd含量分别降低了7．4％-8．1％、43．2％-50％和18．2％-42．5％；本研究结果表明喷磷能够明显促进草莓对Cd胁迫的抗性，缓解Cd对植物的毒害作用，在生物Cd污染防治方面提供科学依据。

Pot experiments were carried out to investigate the influence of Phosphorus （P） on the growth, contents of chlorophyll, carotenoid and MDA, accumulation and chemical forms of cadmium （Cd） in Fragaia ananassa D. which exposed to different Cd levels （5, 10 and 20 mg kg-1）. The results showed that the contents of chlorophyll and carotenoid in Fragaia ananassa D. were increased by P, while the MDA content was decreased. The concentrations of Cd chemical forms in the Fragaia ananassa D. shoot were in the order of FNaO〉 FHAC 〉FE〉Fr〉FHa〉Fw. The NaCl-extractable Cd, water extractable Cd and hydrochloric acid extractable Cd concentrations in shoot were respectively reduced by 7.4% - 8.1%, 43.2% - 50% and 18.2% - 42.5% in the presence of P. All the findings indicate that P can promote the Fragaia ananassa＇s Cd-resistant ability and relieve toxic effects of Cd in plants. Results for mutual impacts between Cd and P will provide scientific foundation for prevention of cadmium contamination.