利用^(14)示踪研究玉米/花生间作玉米根系分泌物对花生铁营养影响的机制  

THE MECHANISMS OF ROOT EXUDATES OF MAIZE IN IMPROVEMENT OF IRON NUTRITION OF PEANUT IN PEANUT/MAIZE INTERCROPPING SYSTEM BY ^(14)C TRACER TECHNIQUE

作　　者：左元梅[1] 陈清[1] 张福锁[1] 

机构地区：[1]农业部植物营养学重点实验室

出　　处：《核农学报》2004年第1期43-46,共4页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金资助项目 ( 3 0 170 185 )

摘　　要：通过14 C示踪技术研究间作条件下玉米根系分泌物改善花生铁营养的作用。结果表明 ,玉米根系的分泌物可穿越尼龙网而到达间作花生的根际 ,同正常间作的花生一样 ,与单作相比 ,两种间作花生的铁营养状况得到了明显的改善 ,玉米光合作用固定的碳可通过根系分泌物进入花生根际并转移到花生的根系和地上部 ,玉米根系分泌物可活化土壤难溶性铁而提高土壤有效铁含量 。The related mechanisms of root exudates of maize in improvement iron nutrition of peanut intercropped with maize was investigated by 14C tracer technique. Neighboring roots between maize and peanut were separated by a 30μm nylon net, the iron nutrition of peanut was also improved just like normal intercropping of maize and peanut. The results proved that root exudates of maize played an important role in improvement iron nutrition of peanut. The photosynthesis carbohydrate of maize could exuded into the rhizosphere of peanut and transfer into shoot and root of peanut in intercropping system. Root exudates of maize could increased efficiency of iron in soil and improved iron utilization of peanut.

关 键 词：玉米 花生 间作 根系分泌物 铁营养 作用机制 碳14同位素示踪技术 

分 类 号：S124[农业科学—农业基础科学]