外源钾肥影响碳氮积累并改善烟草幼苗低温抗性

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关键词：烟草；幼苗；外源钾肥；碳氮积累；低温胁迫；低温抗性；生理响应

中图分类号： S143.3+9 ;S572 文献标识码：A

文章编号：0439-8114（2025）07-0036-04

DOI：10.14088/j.cnki.issn0439-8114.2025.07.007

Effects of exogenous potassium fertilizer on carbon and nitrogen accumulation and its enhancement of chilling tolerance in tobacco seedlings

CHEN Tao 1 ，LIGuo-lan1，FUHui-jie²，ZHU Song-fa1，SONGWen-jing³，ZHANGYa-li²，YUKe-ke³ （1.Samingca；buio 210019，Ciasiebsecheadalesingoadoia;4 Resources and Environmental Sciences，Nanjing Agricultural University，Nanjing 21Oo95，China）

Abstract：Indertoexploeteeftofexogenuspotassiumfertlronteesistaneofflueuredtobacctochilingstrss，the effects of spraying 0.1% potassium dihydrogen phosphate（T1）and 0.1% potassium fulvic acid（T2）on the growth and development， carbonandnitrogencontentandantioxidantenzymesystemoftobaccowerestudied byindoorandfieldexperiments.Theresults showedthatcomparedtothecontrol（CK，foliarspraywithdistiledwater），theshotdryweightofTandT2increasedsignificantly by 65.8% and 27.2% ，respectively. The root dry weight of T1 and T2 increased significantly by 133.3% and 72.2% compared to the control，respectively. The total carbon content of T1 and T2 increased significantly by 17.4% and 20.2% compared to the control，respectively.The soluble sugar content and soluble protein content of T1 increased significantly by 26.4% and 41.5% compared to the control，respectively.Compared to thecontrol，the catalase activityof T1 and T2 increased significantly by 76.2% and 38.3% ，respectively，and the total antioxidant capacity increased significantlyby 250.2% and 40.8% ，respectively.The comprehensive evaluation resultsofthemembershipfunctionmethodshowedthathecomprehensivelowtemperatureresistanceofT1wasthebest.Itwasrecommended to spray 0.1% potassium dihydrogen phosphate during the tobacco transplanting period and the period of late spring frosts to improve cold resistance of tobacco to low response.

KeyWords：tbao；sedings;exognouspoassim；caboandnitrogenalatio;chillingstress；chillntolerane；pi logical response

低温是影响作物的重要非生物逆境[，严重影响作物生长发育、产量和质量[2.3]。（剩余5483字）