不同烤烟品种生长后期氮素代谢差异的中期报告摘要：氮素是影响植物生长和产量的重要营养元素，对烤烟的生育和品质影响显著。为了探究不同烤烟品种在生长后期的氮素代谢差异，本文对三个烤烟品种（玉米烟、丰水槟烟、红塔山烟）进行了中期报告。结果表明，不同品种烤烟在生长后期氮素代谢均存在差异。具体来说，丰水槟烟生长后期氮素利用率和相关酶活性较高，氮素积累和蛋白合成活性较弱；红塔山烟生长后期氮素积累和蛋白合成活性较高，氮素利用率和相关酶活性相对较弱；而玉米烟则表现出氮素代谢的平衡状态，相应指标表现中等水平。关键词：烤烟；氮素代谢；品种差异；生长后期Abstract:Nitrogenisanimportantnutrientelementthataffectsthegrowthandyieldofplants,andhasasignificantimpactonthegrowthandqualityoftobacco.Inordertoexplorethedifferencesinnitrogenmetabolismofdifferenttobaccovarietiesinthelatestageofgrowth,thispaperreportedonthreetobaccovarieties(corntobacco,Fengshuibintobacco,andHongtaMountaintobacco)inthemiddlestage.Theresultsshowedthatthereweredifferencesinnitrogenmetabolismamongdifferentvarietiesoftobaccointhelatestageofgrowth.Specifically,Fengshuibintobaccohashighernitrogenutilizationefficiencyandrelatedenzymeactivityinthelatestageofgrowth,andweakernitrogenaccumulationandproteinsynthesisactivity;HongtaMountaintobaccohashighernitrogenaccumulationandproteinsynthesisactivity,andrelativelyweakernitrogenutilizationefficiencyandrelatedenzymeactivity;whilecorntobaccoshowsastateofbalanceinnitrogenmetabolism,withcorrespondingindicatorsshowingamoderatelevel.Keywords:tobacco;nitrogenmetabolism;varietydifferences;latestageofgrowth