施肥和外源砷对小白菜生长和抗性生理的影响  

Effects of fertilization and exogenous arsenic on resistance physiology and growth of pak-choi

作　　者：马茹茹[1] 卜玉山[1] 史晓凯[1] 

机构地区：[1]山西农业大学资源与环境学院,山西太谷030801

出　　处：《植物营养与肥料学报》2012年第5期1213-1219,共7页Journal of Plant Nutrition and Fertilizers

基　　金：国家"十一五"支撑计划课题资助基金(2007BAD88B03)资助

摘　　要：通过盆栽试验,研究了施用有机肥料与氮、磷、钾肥以及不同浓度砷对小白菜(Brassica campestris L.ssp.Chinensis L.)株高、根长、单株鲜重、砷含量以及小白菜植株脯氨酸(Pro)、丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物酶(POD)等的影响。结果表明:在施肥条件下外源砷10 mg/kg促进小白菜生长,鲜重最高,株高、根长增加,外源砷继续提高则抑制小白菜生长;小白菜砷含量随外源砷提高而增加,施肥则促进砷吸收;小白菜Pro和MDA含量随外源砷提高而增加,施肥则有助于降低Pro和MDA含量;小白菜POD活性在不施肥处理下随砷浓度的提高呈"上升—下降"的变化趋势,且以砷50 mg/kg时最高;在施肥条件下随砷浓度的增加而增强;小白菜SOD活性在有机肥处理下随砷浓度的增加而增强,在不施肥、施氮磷钾肥以及氮磷钾肥和有机肥混施处理下随砷浓度的升高呈"上升—下降"的变化趋势,均以砷50 mg/kg处理最高。A pot experiment was conducted to study the effects of different fertilizers and concentrations of arsenic on plant height, root length, fresh weight, As content, proline （Pro.） content, malondialdehyde （MDA） content, and superoxide dismutase （SOD） and peroxidase （POD） activities of pak-choi （Brassica campestris L. ssp. Chinensis L.）. The results show that the arsenic fertilization stimulateds the growth of pak-choi at the concentration of 10 mg/kg under the fertilization treatments, the fresh weight per plant of pak-choi is the highest and the plant height and root length are increased. But the growth of pak-choi is inhibited, as exogenous arsenic concentration is increased. The arsenic contents of pak-choi plant are increased with the increase of the exogenous arsenic concentration, and the fertilization is also increased the content of arsenic in pak-choi plant. The contents of Pro and MDA in pak-choi plant are all increased with the increase of the exogenous arsenic concentration, while those are decreased in fertilization treatments. The activity of POD in pak-choi changes with a pattern of up-down, as exogenous arsenic increased, and is highest at the arsenic concentration of 50 mg/kg in no-fertilizer treatment, and is increased in the fertilization treatments. The activity of SOD in pak-choi is increased, as exogenous arsenic concentration increased in the organic fertilizer treatment, and changes with a pattern of up-down and is highest at the arsenic concentration of 50 mg/kg in the treatments of no-fertilizer, NPK fertilizers, and NPK fertilizers mixed with organic fertilizer.

关 键 词：小白菜 施肥 外源砷 生长 脯氨酸 MDA SOD POD 

分 类 号：S634.3[农业科学—蔬菜学]