桔梗开花后可溶性糖和淀粉分配特性研究祝丽香王建华孙印石唐行涛耿慧云（1山东农业大学农学院·作物生物学国家重点实验室，山东泰安271018）摘要：以2年生桔梗为材料，研究开花后植株体内可溶性糖和淀粉的分配特性。结果表明，在桔梗开花和果实发育过程中，根部淀粉、可溶性糖含量逐渐下降，开花后25d降至最低。花枝和去花枝中可溶性糖含量开花后15d降至最低而后逐渐上升，淀粉含量变化趋势明显不同，花枝淀粉含量呈现先上升后下降的单峰曲线，去花枝淀粉开花后呈上升趋势。去花枝叶片中可溶性糖含量高于花枝。与前1d17：00时相比，经过一夜的消耗，早晨8：00时花枝叶片可溶性糖含量没有显著差别，而去花枝叶片则明显降低，叶片中淀粉含量与可溶性糖含量变化趋势相反。结果表明，桔梗开花后25d内，根部淀粉分解为可溶性糖运至茎部暂时储存后，供给叶片、花和果实发育。25d后，根部淀粉和可溶性糖含量开始升高，植株地上部分制造的有机物向根部供应促进根部发育。关键词：桔梗；淀粉；可溶性糖；分配特性中图分类号：S567.2文献识别码：A文章编号：0513-353X（2009）TheSolubleSugarandStarchAllocationCharacteristicsafterFloweringDevelopinginPlatycodongrandifloriumZHULi-xiang,WANGJian-hua*,SUNYin-shi,TANGXing-tao,andGENGHui-yun(1StateKeyLaboratoryofCropBiology,CollegeofAgronomy,ShandongAgriculturalUniversity,271018Taian,China)Abstract:Two-year-oldPlatycodongrandiflorumwasusedasmaterialstostudytheallocationcharacteristicsofsolublesugarandstarchduringthefloweringandfruitingstage.Theresultsshowedthatthecontentsofstarchandsolublesugarinrootdecreasedgraduallyandreachedtheminimumat25dafterflowering.Thesolublesugarcontentinbranchesdeclinedgraduallyatfirstandreachedtheminimumat15dafterflowering,latelyincreased.Thecontentofstarchinbranchesshowedsignificantlydifferencebetweenbrancheswithflowerandflowercutted-off.Thecontentofstarchinbrancheswithflowerappearedthetrendofriseatfirstthendropping,whilethestarchcontentinbrancheswithflowercutted-offshowedsignificantlyrisingtrend.Thetotalsolublesugarcontentwashigherintheleaveswithflowercutted-offthanthatinleaveswithflower.Comparedwiththatat17:00onthepreviousday,afteronenightconsumption,thetotalsolublesugarcontentintheleaveswithflowercutted-offdecreasedobviouslyat8:00a.m,butthechangeintheleaveswithflowerwasnotobvious.Thestarchcontentinleavesappearedoppositetendencycomparingwithsolublesugarcontent.Itwasshownthatstarchintherootdecomposedintosolublesugarandtransportedtothestemfortemporarystoragetomeettheneedofleaves,flowersandfruitsdevelopmentwithin25dafterflowering,thenthecontentsofstarchandsolublesugarinrootwereincreased.Itiswellindicatedthattheorganicmaterialmadebyaerialpartsofplanttransportedtorootandpromotedrootdevelopmentatthisstage.Keywords:Platycodongrandiflorum;Starch;Solublesugar;Allocationcharacteristic收稿日期：2009-10-09；修回日期：基金项目：国家科技支撑计划2006BA106A12-09*通讯作者：Authorforcorrespondence(Email:jhwangjh@163.com)植物生殖生长期间花和果实作为代谢库消耗大量营养物质，花、果实与根部在物质分配上存在竞争关系。对于多年生草本植物来说，繁殖会降低根部物质分配比例（Lubbers＆Lechowicz,1989；孔德良等，2006），甚至消耗其中的储存物质（Snow＆Whigham,1989；Primark＆Stacy,1998）。通1过对人参（陈展宇等，2006）、牡丹（丰亚南等，2007）等的研究表明，摘除花和果实，人为调节库、源关系会影响源叶片光合产物的分配。桔梗[（Platycodongrandiflorum(Jacq.)A.DC.）]花期长，果实数量多，开花结果过程中消耗大量碳水化合物，其中主要是可溶性糖和淀粉。桔梗开花和果实发育所需可溶性糖和淀粉的来源目前未见研究报道。本试验在严格控制库、源关系的条...