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1、安徽農(nóng)業(yè)科學(xué)，JournalofAnhuiAg6．Sci．2015，43(21)：148—150責(zé)任編輯陳玉敏責(zé)任校對李巖干旱和復(fù)水對紫花苜蓿幼苗生長的影響趙大華，溫智鵬(1．私立華聯(lián)學(xué)院園林生態(tài)工程系，廣東廣州51o663；2．仲愷農(nóng)業(yè)工程學(xué)院園藝園林學(xué)院，廣東廣州51o225)摘要[目的]揭示干旱脅迫對紫花首蓿幼苗生長的影響。[方法]以紫花苜蓿“正道”為試驗材料，對干旱脅迫及復(fù)水條件下紫花苜蓿幼苗的葉片相對含水量、葉綠素含量、地上生物量及地下生物量、植物葉片形態(tài)、氣孔開度等形態(tài)指標(biāo)及生理生化指標(biāo)進(jìn)行測定。[結(jié)果]干旱脅迫下紫花苜蓿葉片相對含水量、
2、葉綠素含量、葉片長度、葉片寬度、葉片厚度均逐漸減少；復(fù)水后葉片相對含水量、葉綠素含量增加，而葉片長度、葉片寬度、葉片厚度則無明顯增加。在干旱脅迫下，紫花苜蓿主根長度、主根直徑、地上生物量、總生物量、氣孔長度、氣孔寬度、氣孔開度下降，而根系體積、地下生物量、根冠比、氣孔密度則上升。[結(jié)論]該研究可為紫花苜蓿在干旱地區(qū)和南方地區(qū)的推廣栽培提供理論依據(jù)關(guān)鍵詞紫花苜蓿；干旱脅迫；復(fù)水；幼苗生長中圖分類號$541．1文獻(xiàn)標(biāo)識碼A文章編號0517—6611(2015)21—148—03EfeetsofDroughtStressandRewateringonthe
3、GrowthofAlfalfaSeedlingsZHAODa-hua，WENZhl-pengz(1．DepartmentofLandscapeEcologicalEngineering，PrivateHualianCollege，Guangzhou，Guangdong510663；2．CollegeofHortieuhureandLandscape，ZhongkaiUniversityofAgricultureandEngineering，Guangzhou，Guangdong510225)Abstract『0bjective1Theresearch
4、aimedtorevealtheeffectsofdroughtandrewateringonthegrowthofalfalfaseedlings．fMethodfrrak—ingafalfacuhivar”Zhengdao”astestmaterials，therelativewatercontentofleaves，chlorophyllcontent，abovegroundbiomass，undergroundbiomass，morphologicalindices(suchasmorphologyofplantleavesandstomat
5、a／ape~ure)andphysiologicalandbiochemicalindicesofalfalfaseedlingsunderdroughtstressandrewateringconditionsweredetermined．IResultIUnderdroughtstress，therelativewatercontentofleaves，chlorophyllcontent，leat"length，leafwidthandlearthicknessofalfalfagraduallydecreased．Afterrewaterin
6、g，theleofrelativewatercontentandchlorophyUcontentincreased．howeverleaflength，leafwidthandleafthicknesswerenotsignificantlyincreased．Underdroughtstress，therootlength．rootdiameter，abovegroundbiomass，totalbiomass．stomatalength，widthofstomataandstomatalconductancedecreased，butrootv
7、olume．undergroundbiomass，root—shootratioandstomataldensityincreased．1Conclusion}Theresearchcouldprovidetheoreticalba—sisfor出epopularizafionandcultivationofalfalfajnaridareasandsouthernregions．KeywordsAlfalfa：Droughtstress：Rewatering：Seedlinggrowth紫花苜蓿(Medicagosativa)因其營養(yǎng)價值高、適口性
8、好、而對照組正常澆水，保持土壤絕對含水量在20％左右，處理適應(yīng)性強(qiáng)等特點，在我國西北、華北、東北等地區(qū)廣泛種
