断根对不同苗情花生根系生长分布与衰老特性的影响  

Effects of root cutting under different seedling conditions on root system distribution and senescence character of peanut

作　　者：陈安余[1] 赵长星[1] 王月福[1] 冯锴[1] 王铭伦[1] 

机构地区：[1]青岛农业大学农学与植物保护学院,山东省旱作农业技术重点实验室,山东青岛266109

出　　处：《应用生态学报》2014年第5期1387-1394,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31271657);国家花生产业技术体系项目(Nycytx-19);山东省花生现代产业技术体系项目;山东省“泰山学者”建设项目;山东省高校旱作节水优秀创新团队项目资助

摘　　要：采用箱式栽培方法,研究了花生不同苗情下断根对其根系生长分布和衰老特性的影响.结果表明:旺苗、壮苗和弱苗3种苗情下花生断根对其根系均起到先抑制后促进生长的作用,尤其促进了花生根系向深层土壤的生长;断根对调节根系在土壤中的生长分布效应以旺苗和壮苗较大,对弱苗的调节效应相对较小.与对照相比,3种苗情下花生断根后根系活性、超氧化物歧化酶(SOD)和过氧化物酶(POD)活性均先降低后增加;断根对根系活性、SOD和POD活性的降低幅度以弱苗最大,旺苗最小,壮苗居中;而后期提高幅度则以旺苗和壮苗较大,弱苗最小.断根能够提高后期根系活性,延缓花生根系衰老.The effects of root cutting on root system distribution and senescence character of peanut （Arachis hypogaea） under different seedling conditions were investigated by using the box culture method. The results showed that, with three types of peanut seedlings, including overgrowing, strong and week seedlings, root cutting all first restricted and then promoted the root system growth, especially promoted the root growth to deep soil. This effect was stronger on the overgrowing and strong seedlings, while relatively weaker on the weak seedlings. After root cutting, root activity, superoxide dismutase （SOD） and peroxidase （POD） activity all reduced at first, and then in creased, compared with each control. The extents of decrease in root activity, SOD and POD activi ty were highest in the weak seedlings, lowest in the overgrowing seedlings, and moderate in the strong seedlings. However, in the later stage after root cutting, the extents of increase in root activi ty, SOD and POD activity were higher in the overgrowing and strong seedlings, than in the weak seedlings. Generally, root cutting could promote the root activity of peanut and delay the senes cence

关 键 词：花生 苗情 断根 根系生长分布 衰老特性 

分 类 号：S565.2[农业科学—作物学]