title: Effects of branch solid Fe sulphate implants on xylem sap composition in field-grown peach and pear: changes in Fe, organic anions and pH.
abstract: 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.
authors.affiliation: Department of Plant Nutrition, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Apdo. 202, E-50080 Zaragoza, Spain.
authors.forename: Ajmi
authors.initials: A
authors.lastname: Larbi
authors.forename: Fermín
authors.initials: F
authors.lastname: Morales
authors.forename: Javier
authors.initials: J
authors.lastname: Abadía
authors.forename: Anunciación
authors.initials: A
authors.lastname: Abadía
mesh_terms: D000838:Anions / Q000378:metabolism; D001692:Biological Transport / Q000187:drug effects; D002734:Chlorophyll / Q000378:metabolism; D002951:Citrates / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000378:metabolism; D058085:Iron Compounds / Q000494:pharmacology*; D018514:Plant Structures / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D027861:Prunus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D031989:Pyrus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D013431:Sulfates / Q000494:pharmacology
chemical_list: D000838:Anions; D002951:Citrates; D058085:Iron Compounds; D013431:Sulfates; D002734:Chlorophyll; D007501:Iron