Larbi Ajmi, Morales Fermín, Abadía Javier, Abadía Anunciación
Department of Plant Nutrition, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Apdo. 202, E-50080 Zaragoza, Spain.
J Plant Physiol. 2003 Dec;160(12):1473-81. doi: 10.1078/0176-1617-01010.
The effects of placing solid implants containing Fe sulfate in branches of Fe-deficient pear and peach trees on the composition of the xylem sap have been studied. Iron sulfate implants are commercially used in northeastern Spain to control iron chlorosis in fruit trees. Implants increased Fe concentrations and decreased organic acid concentrations in the xylem sap, whereas xylem sap pH was only moderately changed. The citrate to Fe ratios decreased markedly after implants, therefore improving the possibility that Fe could be reduced by the leaf plasma membrane enzyme reductase, known to be inhibited by high citrate/Fe ratios. In peach, the effects of the implants could be observed many months post treatment. In pear, some effects were still observed one year after the implants had taken place. Results obtained indicate that solid Fe sulfate implants were capable of significantly changing the chemical composition of the xylem sap in fruit trees.
研究了在缺铁梨树和桃树的枝条中植入含硫酸铁的固体植入物对木质部汁液成分的影响。硫酸铁植入物在西班牙东北部被商业用于控制果树的缺铁黄化病。植入物增加了木质部汁液中的铁浓度并降低了有机酸浓度，而木质部汁液的pH值仅略有变化。植入后柠檬酸与铁的比率显著降低，因此提高了铁被叶质膜酶还原酶还原的可能性，已知该酶会受到高柠檬酸/铁比率的抑制。在桃子中，处理后数月即可观察到植入物的效果。在梨中，植入物一年后仍能观察到一些效果。所得结果表明，固体硫酸铁植入物能够显著改变果树木质部汁液的化学成分。
