酸、鋁脅迫對苜蓿初生根伸長的影響.pdf

1、廣西大學(xué)碩士學(xué)位論文酸、鋁脅迫對苜蓿初生根伸長的影響姓名：羅獻(xiàn)寶申請學(xué)位級別：碩士專業(yè)：植物營養(yǎng)學(xué)指導(dǎo)教師：白厚義何勇強(qiáng)2003.5.1Effectofacidityand／oraluminumstressonelongationofalfalfaprimaryrootAbstractInthisstudytheeffectsofacidityand／oraluminum(A1)onalfalfaprimaryrootwereinves

2、tigatedbydifferentwaysofexperiment，theresultindicatesthatalfalfaprimaryrootishighsensitivetoacidityandAI，andbothacidityandAIarestressfactorstoelongationofalfalfaprimaryrootInlow。pHmedium，alfalfaprimaryrootswouldsufferani

3、rreversibledamageandlostviabilitywithin6hexposuretopH41mediumcontaining05mm01L’‘CaThemajorsymptomsdevelopedbylowpHincludescurvatureandetiolationinrootapicalIncontrasttolow—pHstre3s’ThesymptomsbyAIinducescurvatureturgoran

4、dchangingcolortobrowninrootapicalandresultsinathinnermucilagesecretedfromroottipAtpH45，eIongationofalfalfaprt吼aryrootexposedto3pm01L‘AIfor8hwasinhibitedbymorethan50％Experimentusingcellwallofalfalfaprimaryroottipshowedtha

5、tbothlowpHandAIcouldinhibitcellwallautolyticactivityAdditionalcal。iumcouIdnotonlyalleviatestressonprimaryrootinducedbyacidityandAIeffectivelybutalsoaileviatetheinhibitionofcellwallautolysisresultedfromacidity(partly)andA