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1、棉花学报CottonScience2014袁26渊6冤院506~512不同基因型棉花磷效率特征及其根系形态的差异陈波浪袁盛建东袁蒋平安袁李卫华袁王靓(新疆农业大学草业与环境科学学院袁乌鲁木齐830052)摘要院在水培条件下袁以棉花磷高效品种新海18号和低效品种新陆早13号为材料袁研究不同供磷条件下其生物量尧磷素积累量尧根系参数的差异遥结果表明袁在低磷与适磷时袁高效基因型新海18号的磷利用效率分别为1129.2g窑g-1和262.7g窑g-1袁而低效基因型新陆早13号为1090.9g窑g-1和123.0
2、g窑g-1曰新海18号地上部分磷积累量占全株磷积累量的比例分别为57.5%和48.3%袁新陆早13号分别是49.9%和53.8%遥低磷时袁新海18号总根长尧根总表面积和根总体积分别增加36.0%尧145.7%和96.9%袁新陆早13号总根长和根总表面积则显著下降袁新海18号根系各参数均高于新陆早13号遥表明高效品种具有较强的磷素利用效率和较好的根系形态参数遥关键词院棉花曰基因型曰磷效率曰根系形态中图分类号院S562.01文献标志码院A文章编号院1002-7807(2014)06-0506-07Chen
3、Bolang,ShengJiandong,JiangPing'an,LiWeihua,WangLiang(830052,)Toprovideabasisforexploringthemechanismofhighphosphorus(P)useefficiencyanduptakeefficiencyincottongenotypes,phosphorusefficiencycharacteristicsandrootmorphologywereinvestigatedintwodifferentco
4、ttongenotypes.Usingasolutionculturemethod,ahighphosphorusefficiencygenotype(Xinhai18)andalowphosphorusefficiencygenotype(Xinluza-o13)wereevaluatedfordifferencesindrymatterweight,phosphorusaccumulationandrootparametersunderdifferentPappli-cationrates.The
5、resultsshowedthattheP-efficiencyofthegenotypeXinhai18was1129.2g窑g-1and262.7g窑g-1atlow(0.01伊10-3mol窑L-1)andhigh(1伊10-3mol窑L-1)Plevels,respectively,whilethatofthegenotypeXinluZao13was1090.9g窑g-1and123.0g窑g-1.Inaddition,thegenotypeXinhai18hadgreaterability
6、totransferPtotheshootthanXinluzao13.UnderthetwodifferentPlevels,shootPaccumulationinXinhai18was57.5%and48.3%ofthewholeplant,whilethatofXinluzao13was49.9%and39.4%.WhenPwasinsufficient,thetotalrootlength,totalrootsurfaceareaandtotalrootvolumeofXinhai18inc
7、reasedby36.0%,145.7%and96.9%,respectively,whilethetotalrootlengthandtotalrootsurfaceareaofXinluzao13significantlyde-epscreased.ParticularlywhentheenvironmentalPconcentrationwaslow,Xinhai18hadabetterrootsystemthanXinluzao13.Theseexperimentsindicatedthath
8、ighefficiencygenotypeshavethecapacityforgreaterphosphorususeefficiencyandoptimalrootmorphologyparameters.cotton;genotype;phosphorusefficiency;rootmorphology[2-5]磷是农业生产重要的物质保证袁也是不可再缺失面积趋于减少遥由于磷在土壤中易被固生的矿质资源袁据肥料发展中心乐观估计袁磷矿定尧移动性差袁导致
