资源描述：
《水培磷胁迫下不同基因型棉花苗期根系形态及叶片光合特性的差异》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、棉花学报CottonScience2015袁27渊3冤院223―231水培磷胁迫下不同基因型棉花苗期根系形态及叶片光合特性的差异宋世佳袁孙红春袁张永江袁刘连涛袁白志英袁李存东*渊河北农业大学/河北省作物生长调控实验室袁农学院袁河北保定071001冤摘要院水培条件下袁以彩棉品种中棉所51号渊浅棕冤尧中棉所81号渊深棕冤尧中棉所82号渊深绿冤和普通白棉品种国欣棉3号为材料袁研究3个不同的磷素渊KHPO冤水平院缺磷渊0mmol窑L－1冤尧低磷渊0.5mmol窑L－1冤和适磷渊1225mmol窑L－1冤对棉花苗期根系形态尧根冠比尧
2、叶片光合特性的影响遥结果表明院低磷极显著提高了棉花总根长和根表面积曰缺磷严重抑制了棉花根系的生长袁但是随着处理时间的延长袁棉花根系生长得以自我调节袁减轻了胁迫的影响遥低磷处理后10d袁总根长尧根表面积尧根体积尧根冠比均以白棉提高的最多曰处理后20d则以浅棕棉提高的最多遥缺磷胁迫下袁白棉和深棕棉在处理后20d根系生长受到的抑制程度相比于处理后10d加重袁而其他品种则随着胁迫时间的延长袁抑制程度减轻遥不同品种的光饱和点和最大光合速率差异的表现均是浅棕棉＞白棉＞深棕棉＞深绿棉遥随着磷素供应水平的降低袁白棉的光饱和点和最大光合速率
3、也逐渐降低袁而两个棕色棉的光饱和点则表现为低磷＞缺磷＞适磷遥表明白棉能耐短期的磷素胁迫袁浅棕棉和深绿棉能耐较长期的磷素胁迫袁深棕棉对磷素胁迫较钝感遥关键词院磷胁迫曰基因型曰棉花曰根系形态曰光合特性中图分类号院S562.01文献标志码院A文章编号院1002-7807渊2015冤03-0223-0910.11963/issn.1002-7807.201503005*SongShijia,SunHongchun,ZhangYongjiang,LiuLiantao,BaiZhiying,LiCundong(071001,)Alab
4、oratoryexperimentwascarriedouttostudytherootmorphologyandleafphotosyntheticcharacteristicsofthreecoloredcottons(CCRI51,lightbrowncotton;CCRI81,darkbrowncotton;andCCRI82,darkgreencotton)andonewhitecot-tonunderdifferentlevelsofphosphorus.Theresultsshowedthatlowerlev
5、elphosphorustreatmentssignificantlyincreasedrootlengthandsurfacearea,whileno-phosphorustreatmentsseriouslyinhibitedrootgrowth.Asthedurationofthetreatmentin-creased,wefoundthatthecottonroothadcarriedoutself-regulationandreducedtheimpactofphosphorusdeficiency.Undert
6、reatmentsoflowerlevelsofphosphorustheincreasedratioofrootlength,rootsurfacearea,rootvolumeandroot/shootratioofGX3werethehighest10daysaftertreatment.InCCRI51,levelswerethehighest20daysaftertreatment.Underno-phospho-rustreatments,theinhibitionratesofGX3andCCRI81root
7、morphology20daysaftertreatmentwerehigherthan10daysaftertreatment.Levelsintheothervarietiesimprovedastheperiodofstresscontinued.Therankingofthedifferentvarietieswithre-specttolightsaturationpoint,maximumphotosyntheticrateandlightcompensationpointofleaveswasCCRI51＞G
8、X3＞CCRI81＞CCRI82.Asthesupplyofphosphorusdecreased,lightsaturationpointandthemaximumphotosyntheticrateofGX3weregraduallyreduced,butlightsaturationpointof
