功能性微生物制剂对镉胁迫下水稻生长及生理特性的影响

摘要

采用水培法，研究了功能性微生物制剂（ RD、X、J ）对镉胁迫下水稻生长及生理特性的影响。结果表明，微生物制剂RD和X处理对水稻叶片过氧化氢酶（ CAT）活性的提升效果最佳，还可减小叶片谷胱甘肽还原酶（ GR）活性下降的幅度。镉胁迫6 d时，RD对降低叶片O·－2浓度的能力强于X和J。 RD处理后SOD活性基本稳定，X和J处理后SOD活性先降低后升高，但J处理后SOD活性升高幅度最大。功能性微生物制剂显著增加镉胁迫下水稻株高和千粒质量（千粒质量增加2�51％～4�45％），但对分蘖数的影响不显著。可见，功能性微生物制剂可增强水稻抗氧化酶系的防御能力，提高水稻对镉胁迫的抗性，促进生长。%The effects of functional microorganism agents ( RD, X and J) on the growth and physiological character⁃istics of rice under cadmium stress were investigated by water culture. The treatments with RD or X increased the activities of catalase ( CAT) and delayed the decrease of the activities of glutathione reductase ( GR) . As cadmium stress lasted, the ability of agent RD to reduce O·-2 concentration in leaves was greater than that of X or J. The activity of SOD, basically sta⁃ble in RD treatment decreased and bottomed up in treatment X or J. The increased activity of SOD by J was bigger than by X. Functional microorganism agents had a positive effect on plant height and thousand⁃grain weight of rice under cadmium stress. Tillering was barely influenced. Functional microorganism agents could enhance the defensive enzymes�activities and cadmium⁃tolerance of rice so as to promote growth under cadmium stress.