乌桕优选单株种子及幼苗生长与生理特性研究

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1、在今后的干旱试验中，可以采用PEG6000模拟干旱试验代替耗时较长的自然干旱试验。(6)通过对种子性状和子代幼苗生长状况、光合特性、抗逆性的相关性分析，得出：优株种子的外形特征(即种子宽度、去蜡层种子宽度、种子百粒重)与其子代幼苗6月份的苗高生长呈显著正相关；优株种子总油含量和梓油中硬脂酸含量与其6月份的苗高生长呈负显著相关；优株种子梓油含量与其幼苗日均水分利用效率呈正显著相关；种子的外形特征对干旱试验中植株的含水量指标影响很大，呈正显著相关；苗高差值与日均净光合速率和日均蒸腾速率呈正显著相关。因

2、此，在今后对乌桕的栽培种植中，应尽可能选择梓油含量高，外形饱满的种子进行播种栽培，而对幼苗进行引种时，应尽可能选择苗高高的幼苗进行引种栽培。关键词：种子特性；生长特性；光合特性；耐旱性；预测ⅡABSTRACTSapiumsebiferum(Linn．)Roxb．belongstoSapiumJacq．ofEuphorbiaceae，itisdeciduoustreeswithsignificantvaluesinLandscapingandprovdignindustryoil．．Theseede

3、nricheswithpilloilandstillingiaoil，whichwasanidealsubstitutionofcocoabuaerandbiodieselfeedstocksrespectively．Inthispaper'aimedatselectingplusgermplasmofhighefficientphotosynthesisandstrongresistancetodrought，lyearseedlingsgrowingfromseedsharvestedfrom

4、6differentplustreeslocatedatSanzicounty,DaocountyofHunanprovince，NanjingcityofJiangsuprovinceandShaoguangofGuangdongprovinceweretreatedwithPEG6000simulateddroughtstressanddroughtstressnaturally,andtheninvestigationandanalysisontraitsofphotosynthesisan

5、ddrought-resistatantamongthemwereconducted．Meanwhile，correlationamongseedsqualityandgrowthvigor,photosynthesiscapacity,resistanttodroughtstresswltsanalyzed，SOastogetreferencesforselectinggoodgermplasmofSapiumsebiferumTheresultsshowedasfollowings：(1)El

6、iteSapiumsebiferumhadgreatdifferencesamongfruits，seedsandoil，whichcouldbeusedasimportantparametersinthefuturework．TheseedcharacteristicsshowedthatSangzhi12Washeavierthanothers，Shaoguan23and24hadmoretotaloilthanothersandNanjing13wasmorestablethanSangzh

7、iandShaoguanelitestrains．AndthosewouldbetheindexesforselectingplusgermplasmofeliteSapiumsebiferum(2)Seedqualityandoilqualityshowedthatthetotaloil(skinoil+azusaoil)negativelyrelatedtotheseedweightafterremowingwaxy．ThesamerelationshipbetweenC18：0andC18：

8、l；butthetotaloilcontentpositivelyrelatedtoC18：0．(3)PlantheightandbasaldiametershowedthateliteSapiumsebiferumoffspringseedlingsgainedthemaximumgrowthinJulyanddifferentiatedmostlyinAugust．Therefore，itisimportanttostudythephysiologicalcharacteris