砷胁迫下磷用量对不同磷效率水稻苗生长、磷和砷吸收的影响  

Effect of Different P Levels on the Growth,P and As Absorption of Different P-efficiency Rice Varieties under As Stress Conditions at Seedling Stage

作　　者：连娟[1] 郭再华[1] 贺立源[1] 

机构地区：[1]华中农业大学资源与环境学院,湖北武汉430070

出　　处：《中国水稻科学》2013年第3期273-279,共7页Chinese Journal of Rice Science

基　　金：国家自然科学基金资助项目(40701076);中央高校基本科研业务费专项资金资助项目(2011PY110)

摘　　要：通过盆栽试验研究了苗期砷胁迫下磷用量对磷高效水稻99011和磷低效水稻99056生长以及对P、As吸收的影响。试验设3个磷水平(0、30、150mg/kg)和5个砷水平(0、25、50、100、200mg/kg)。结果表明,苗期施砷显著增加了两个水稻品种地上部及地下部砷的含量,降低了两个水稻品种的株高、分蘖数、地上部及地下部干质量;施磷不但促进了两个水稻品种的生长,而且还增加了根系对砷的吸收量。当土壤砷浓度为25mg/kg和50mg/kg时,施用30mg/kg磷抑制了两个水稻品种砷向地上部的转移,但施用150mg/kg磷却促进了砷向地上部的转移。相同的处理,磷高效水稻99011地上部干质量和根干质量均显著高于磷低效水稻99056。施砷后,在30mg/kg磷水平上磷低效水稻99056的砷转移系数最低。A pot trial was conducted to clarify the effect of different phosphorus （P） levels on the growth, P and arsenic （As） absorption of Pefficient rice 99011 and Pinefficient rice 99056 under As stress conditions. P was applied at three rates （0, 30 and 150 mg/kg） and As at five rates （0, 25, 50, 100 and 200 mg/kg） in soil. Results showed that application of As increased shoot and root As concentration and decreased plant height, tiller number, shoot and root dry weight of the two rice varieties. Application of P increased the growth as well as the root As concentration of the two rice varieties. At 25 mg/kg and 50 mg/kg of As in soil, application of 30 mg/kg P decreased the translocation of As from roots to shoots and application of 150 mg/kg P increased the translocation of As from roots to shoots of the two rice varieties. Under the same treatment, shoot and root dry weight of Pefficient rice 99011 were significantly higher than those of Pinefficient rice 99056. Under the As treatment, the translocation factor of As in Pinefficient rice 99056 minimized at 30 mg/kg P treatment.

关 键 词：磷 砷 水稻 砷转移系数 

分 类 号：S511[农业科学—作物学]