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1、l4廣東農(nóng)業(yè)科學2014年第2期酚酸對煙苗根系生長及葉片光合特性的影響王茂勝,李明。,楊秀祥,汪漢成!,邱忠智,蔣選利(1.貴州大學農(nóng)學院,貴州貴陽550025:2.貴州省煙草科學研究院/煙草行業(yè)煙草分子遺傳重點實驗室,貴州貴陽550081:3.中國煙草公司貴州省公司,貴』I'1貴陽550004;4.貴州省興義市煙草公司,貴州興義562400)摘要:為了解酚酸類他感物質(zhì)對煙苗生長發(fā)育的影響,研究了苯甲酸、對羥基苯甲酸和水楊酸對煙苗根系發(fā)育、氣體交換特征、葉綠素熒光參數(shù)及葉綠素含量的影響。結(jié)果表明,3種酚酸隨著濃度的增加,煙苗葉片葉綠素含量(SPAD值)均呈先
2、增加后降低趨勢;3種酚酸能夠顯著抑制煙苗根系發(fā)育,隨著濃度增加,根尖數(shù)、總根長和總根表面積呈先升后降或直接降低的趨勢;3種酚酸能夠降低凈光合速率(Pn),苯甲酸差異不顯著;3種酚酸對葉綠素熒光參數(shù)均有影響,隨著濃度的增加,F(xiàn)v/Fm有降低趨勢,但差異不顯著,qP和~PSII呈顯著下降趨勢.NPQ呈顯著升高趨勢。本試驗證明了3種酚酸對煙苗根系發(fā)育、光合作用有抑制作用關(guān)鍵詞:烤煙;根系提取物;自毒作用;化感作用;酚酸中圖分類號:$572文獻標識碼:A文章編號:1004—874X(2014)02—0014—05Efectofphenolicacidontheroo
3、tgrowthandphotosyntheticcharacteristicsoftobaccoseedlingWANGMao—sheng,LIMing,YANGXiu-xiang,WANGHan—eheng,QIUZhong~zhi.JIANGXuan—li(1.AgriculturalCollegeofGuizhouUniversity,Guiyang550025,China;2.GuizhouTobaccoResearchlnstitute/KeyLaboratoryofMolecularGenetics.GuizhouAcademyofTobacco
4、Science,Guiyang550081,China;3.ChinaTobaccoCorporationGuizhouCompany,Guiyang550004.CnⅡ:4.XingyiTobaccoMonopolyBureau,Xingyi562400,China)Abstract:Inordertoinvestigatetheinfluenceofphenolicallelochemicalsonthegrowthanddevelopmentoftobaccoseedlings,effectofbenzoicacid,p-hydroxybenzoica
5、cidandsalicylicacidonseedlingrootgrowth,characteristiesofgasexchange,chlorophyllfluorescenceparametersandchlorophyllcontentoftobaccowereanalyzedinthisstudy.ResultshowedthatchlorophyllcontentofseedlingleaffSPADvalue1firstincreasedandthendecreasedwiththeenhanceHientofthethreephenolic
6、acids;Threephenolicacidsallsignificantlyinhibitedthegrowthoftobaccoseedlingroot,suchastipnumber,totalrootlengthandtotalrootsurfaceareawhichshowedthetrendoffirstincreasedandthendecreasedordecreaseddirectly;threephenolicacidsalldecreasedthenetphotosyntheticrate(Pn),therewasnosignific
7、antdifferenceinthetreatmentofbenzoicacid;threephenolicacidsal1hadeffeetonchlorophyllfluorescenceparameters.theFv/Fmvaluedecreasedwiththeincreasingofconcentrations,whilewithnosignificantdiference,qPandPSIIvaluessignificantlydecreased.Ourstudyexhibitedthatallthreephenolicacidsinhibit
8、edthedevelopingoftobaccose