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1、棉花學(xué)報(bào)CottonScience2015袁27淵3冤院223―231水培磷脅迫下不同基因型棉花苗期根系形態(tài)及葉片光合特性的差異宋世佳袁孫紅春袁張永江袁劉連濤袁白志英袁李存東*淵河北農(nóng)業(yè)大學(xué)/河北省作物生長調(diào)控實(shí)驗(yàn)室袁農(nóng)學(xué)院袁河北保定071001冤摘要院水培條件下袁以彩棉品種中棉所51號(hào)淵淺棕冤堯中棉所81號(hào)淵深棕冤堯中棉所82號(hào)淵深綠冤和普通白棉品種國欣棉3號(hào)為材料袁研究3個(gè)不同的磷素淵KHPO冤水平院缺磷淵0mmol窯L－1冤堯低磷淵0.5mmol窯L－1冤和適磷淵1225mmol窯L－1冤對棉花苗期根系形態(tài)堯根冠比堯
2、葉片光合特性的影響遙結(jié)果表明院低磷極顯著提高了棉花總根長和根表面積曰缺磷嚴(yán)重抑制了棉花根系的生長袁但是隨著處理時(shí)間的延長袁棉花根系生長得以自我調(diào)節(jié)袁減輕了脅迫的影響遙低磷處理后10d袁總根長堯根表面積堯根體積堯根冠比均以白棉提高的最多曰處理后20d則以淺棕棉提高的最多遙缺磷脅迫下袁白棉和深棕棉在處理后20d根系生長受到的抑制程度相比于處理后10d加重袁而其他品種則隨著脅迫時(shí)間的延長袁抑制程度減輕遙不同品種的光飽和點(diǎn)和最大光合速率差異的表現(xiàn)均是淺棕棉＞白棉＞深棕棉＞深綠棉遙隨著磷素供應(yīng)水平的降低袁白棉的光飽和點(diǎn)和最大光合速率
3、也逐漸降低袁而兩個(gè)棕色棉的光飽和點(diǎn)則表現(xiàn)為低磷＞缺磷＞適磷遙表明白棉能耐短期的磷素脅迫袁淺棕棉和深綠棉能耐較長期的磷素脅迫袁深棕棉對磷素脅迫較鈍感遙關(guān)鍵詞院磷脅迫曰基因型曰棉花曰根系形態(tài)曰光合特性中圖分類號(hào)院S562.01文獻(xiàn)標(biāo)志碼院A文章編號(hào)院1002-7807淵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
