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1、植物营养与肥料学报2007,13(3):458-463PlantNutritionandFertilizerScience烤烟根系分泌物对烤烟幼苗生长和养分吸收的影响1,322131郭亚利,李明海,吴洪田,袁玲,黄建国(1西南大学资源环境学院,重庆北碚400716;2遵义烟草公司,贵州遵义563000;3黔西南州烟草公司,贵州兴义562400)摘要:连作是烟草栽培中的普遍现象,已引起生长抑制、产量下降和品质恶化等问题。本试验采用溶液培养的方法,在培养液中分别加入未分组和分组后的烤烟根系分泌物,研究根系分泌物对烤烟幼苗生长和养分吸收
2、的影响。结果表明,加入未分组的烤烟根系分泌物显著抑制幼苗的生长,降低根系活力,并随加入量的增加抑制作用增强;加入酸溶性、碱溶性、中性组分的根系分泌物,均降低幼苗根系活力,以中性组分的抑制作用较强。三种不同组分-3-+-的根系分泌物均显著降低根系对NO3、PO4、K离子的吸收,其中中性组分对NO3吸收的影响最大,而酸溶性组+分对K的吸收抑制作用较强。推测在烤烟根系分泌物中,可能存在多种抑制烤烟生长和养分吸收的化学物质。关键词:烤烟;根系分泌物;幼苗生长;养分吸收中图分类号:Q945112文献标识码:A文章编号:1008-505X(2
3、007)03-0458-06Effectsofrootexudatesongrowthandnutrientsuptakeoftobaccoseedlings1,322131GUOYa2li,LIMing2hai,WUHong2tian,YUANLing,HUANGJian2guo(1CollegeofResourceandEnvironment,SouthwestUniversity,Chongqing400716,China;2ZunyiTobaccoCompany,Zunyi563000,China;3SouthwestGu
4、izhouTobaccoCompany,Xingyi,Guizhou562400,China)Abstract:Continuouscropping,whichiscommonlypracticedinthetobaccocultivationareasofchina,broughtaboutanumberofproblemsontobaccoproduction,suchasgrowthinhibition,yielddeclineandqualitydeterioration.Allelopathyofrootexudates
5、isregardedasareasonfortheseproblemsinsomecrops;however,theroleofrootexudatesontobaccoproductionisstillnotveryclear.Weconductedahydroponicsexperimenttostudytheeffectsofrootexudatesonthegrowthanduptakenutrientsoftobaccoseedling.Rootexudateswereobtaineddirectlyfromthecul
6、turesolutionofadulttobaccoseedling,andthenfractionatedintoacidsoluble,alkalinesoluableandneutralgroups.Therefore,thesefraction2atedsolutionswiththeun2fractionatedrootexudatessolutionwereaddedintotheculturesolutionsofyoungseedlingswithfourleaves,respectively.Thecontrol
7、treatmentwasalsosetupwithoutrootexudatescomponentadded.Theresultsshowedthatun2fractionatedrootexudatesinhibitedgreatlythegrowthandrootactivitiesoftheseedlingsfromday20,andtheeffectofrootexudatesincreaseddramaticallywithincreasingamounttherootexudatesadded.Theaddedfrac
8、tionatedrootexudates,especiallyinneutralone,depressedrootactivities.Allofthesefractionatedmaterialsdeclinedsignificant2--+-+
