应用生态学报2011，Vol.22Issue(10)：2539-2545,7.
腐植酸浸种对盐碱胁迫下小麦幼苗抗氧化系统的影响
Effects of seed soaking with humic acid on wheat seedlings antioxidant system under saltalkali stress
摘要
Abstract
The seeds of two spring wheat genotypes Longmai 26 and Kehan 16 were soaked with hu-mic acid to study the effects of seed soaking with humic acid on the seedlings antioxidant system of the two genotypes under NaCl and NajCOj stresses. Under the salt and alkali stresses, the seedlings leaf proline ( Pro) content increased, membrane permeability enhanced, and aboveground fresh mass decreased. Under NaCl stress, the leaf catalase (CAT) activity increased, peroxidase (POD) activity decreased, and superoxide dismutase ( SOD) decreased after an initial increase; under Na2CO3 stress, the CAT and POD activities increased while the SOD activity was in adverse. The activities of the test antioxidant enzymes were higher under Na2CO3 than under NaCl stress. When the seeds were soaked with humic acid, the seedlings leaf glutathione ( GSH) content increased, and the SOD and CAT activities improved, which effectively relieved the damage of salt-alkali stress on the seedlings growth. Some differences were observed in the resistance level and related mechanisms against the salt-alkali stress between the two wheat genotypes, possibly due to their different interactions with the salt ion components and concentrations and the ways of seed soaking.关键词
小麦/幼苗/盐碱胁迫/抗氧化系统/腐植酸Key words
wheat/ seedling/ salt-alkali stress/ antioxidant system/ humic acid.分类
农业科技引用本文复制引用
郭伟,王庆祥..腐植酸浸种对盐碱胁迫下小麦幼苗抗氧化系统的影响[J].应用生态学报,2011,22(10):2539-2545,7.基金项目
黑龙江省科技厅重大项目(G00QY08)和黑龙江省教育厅项目(11531z17)资助. （G00QY08）
