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《Journal of Fruit Science》 2004-01
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Changes of Culture Medium pH and Roots’Fe~(3+) Reductase Activity in 4 Wild Pear Rootstocks Under Iron Deficiency

An Huaming,Fan Weiguo,He Chengpeng,and Zhang Jingrong (Department of Horticulture,Guizhou University,Guiyang,Guizhou5500 25China)  
wild pear rootstocks:P.pashia Buch-Ham,P.serotina Re hder,P.betulaefolia Bunge and P.calleryana Dcne were used for studying the ef fects of iron deficiency on the medium pH and the roots’Fe 3+ reductase activity.Results showed that the medium pH fell rapidly after one day’s treatment without Fe and kept lower all along than that of low Fe tre atment (20ìmol/L)and normal treatment (40ìmol/L).During the first s everal days of the low Fe treatment ,the medium pH went up higher than that of the normal treatment until after4~5days.Furthermore,NH 4+-N in the medium was good to decrease the medium pH and then,to postpone t he chlorotic symptoms under iron deficiency.The roots’Fe 3+ reductase activity of4wild rootstocks increased while there was low or norm al Fe in medium,but their extents differed.The reductase activity of P.serot ina Rehder appeared least and that of P.betulaefolia Bunge was the highest when there was no Fe in the culture medium.However,under the low Fe or normal trea tment ,the order of the reductase activity,which was approximately consistent with appearance of the symptoms ,was P.pashia Buch-Ham,P.serotina Rehder P.betulaefolia Bunge and then P.calleryana Dcne.
【CateGory Index】: S661.2
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