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1、本科生畢業(yè)論文（設(shè)計(jì)）題目：不同光照條件下漬水對(duì)玉米幼苗光合和生長(zhǎng)的影響學(xué)院:專業(yè)班級(jí)：學(xué)生姓名：指導(dǎo)教師：撰寫日期：不同光照條件下漬水對(duì)玉米幼苗光合和生長(zhǎng)的影響（）摘要：玉米苗期耐旱怕澇，苗期土壤水分過多往往對(duì)玉米的生長(zhǎng)和產(chǎn)量形成造成不利影響。同時(shí)，玉米對(duì)淹水的響應(yīng)還受其他環(huán)境因素的影響。本研究以玉米品種鄭單958為試材，探討了兩種不同光照條件下玉米幼苗對(duì)淹水的響應(yīng)差異。結(jié)果發(fā)現(xiàn)，在相對(duì)較高的光照條件下，淹水導(dǎo)致凈光合速率、蒸騰速率和水分利用效率分別降低70％，26％和59％；葉綠素a，葉綠素b和葉綠素
2、a+b分別降低31％，42％和34％；地下生物量和總生物量分別降低52％和34％。低光強(qiáng)條件下，淹水處理6天的幼苗生物量略有下降。淹水對(duì)相對(duì)較高光照強(qiáng)度下生長(zhǎng)的玉米幼苗的光合速率、生物量和冠根比的影響要明顯高于在低光強(qiáng)下生長(zhǎng)的玉米幼苗。結(jié)果提示，盡管玉米是高光效的C4植物，有著較高的光飽和點(diǎn)，但在淹水脅迫下，相對(duì)較高的光照強(qiáng)度仍然加劇了土壤淹水脅迫水浸的影響，而較低的光照強(qiáng)度可以在一定程度上減輕淹水脅迫造成的傷害。因此，我們?cè)谘芯烤垦退畬?duì)玉米生長(zhǎng)發(fā)育的影響時(shí)，應(yīng)考慮光強(qiáng)環(huán)境的變化。關(guān)鍵字：淹水；光照；玉米
3、；光合速率；冠根比EffectsofSoilFloodingonPhotosynthesisandGrowthofZeamaysL.SeedlingsunderDifferentLightIntensitiesHaochen(CollegeofAgriculture08-cropbiotechnology-1)Abstract:Soilfloodingisoneofthemajorabioticstressesthatrepressmaize(ZeamaysL.)growthandyield,andoth
4、erenvironmentalfactorsofteninfluencesoilfloodingstress.Thispaperreportsanexperimentaltestofthehypothesisthatlightintensitycaninfluencetheresponsesofmaizeseedlingstosoilflooding.Inthisexperiment,maizeseedlingsweresubjectedtosoilfloodingatthetwo-leafstageun
5、dercontrollight(600μmolm-2s-1)orlowlight(150μmolm-2s-1)conditions.Undercontrollightgrowthconditions,theaveragePN,EandWUEwere70%,26%and59%,respectively,higherinnon-floodedthaninfloodedseedlings;andtheaverageChla,Chlb,andChla+bwere31%,42%and34%,respectively
6、,higherinnon-floodedthaninfloodedseedlings;andtheaveragebelowgroundbiomassandtotalbiomasswere52%and34%,respectively,higherinnon-floodedthaninfloodedseedlings.Therewasaslightdecreaseofseedlingbiomassinsixdaysfloodedseedlingsunderlowlightgrowthconditions.Th
7、eeffectsoffloodingonphotosynthetic,seedlinggrowthandshoot/rootratioweremorepronouncedundercontrollightgrowthconditionsthanunderlowlightgrowthconditions,whichindicatethatevenformaizeisC4plant,relativelyhighlightintensitystillaggravatedsoilfloodingstresswhi
8、lelowlightgrowthconditionmitigatedsoilfloodingstress,andsuggestthatlighteffectsshouldbeconsideredwhenwestudymaizeresponsestosoilflooding.Keywords:flood,light,maize,photosynthesisrate,shoot/rootratio在旱地作物生產(chǎn)過程中，澇漬是繼干旱
