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Title

Biochemical responses to iron deficiency in kiwifruit (Actinidia deliciosa)

AuthorsRombolà, Adamo Domenico; Brüggemann, Wolfgang; López-Millán, Ana Flor ; Tagliavini, Massimo; Abadía Bayona, Javier ; Marangoni, Bruno; Moog, Petra R.
KeywordsOrganic acids
Iron nutrition
Ferric chelate reductase
Phosphoenol pyruvate carboxylase
Issue DateAug-2002
PublisherHeron Publishing
CitationTree Physiology 22 (12): 869-875 (2002)
AbstractA comparative study of two kiwifruit genotypes (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson var. deliciosa) with different tolerance to iron (Fe) deficiency was conducted to identify biochemical features associated with tolerance to Fe deficiency. After 14 days of growth in hydroponic culture under Fe-deficient and Fe-sufficient conditions, leaf chlorophyll concentration, activities of ferric chelate reductase (FCR), phosphoenolpyruvate carboxylase (PEPC) and citrate synthase in root extracts, concentrations of organic acids in roots, leaves and xylem sap, and xylem sap pH were measured. In response to Fe deficiency, the tolerant genotype D1 showed: (i) higher FCR activity associated with a longer lasting induction of FCR; (ii) higher PEPC activity; (iii) higher concentrations of citric acid in roots; and (iv) lower xylem sap pH compared with the susceptible genotype Hayward. These findings imply that induction of FCR and PEPC activities in roots in response to Fe deficiency are important physiological adaptations enabling Fe-efficient kiwifruit plants to tolerate Fe deficiency.
Publisher version (URL)http://dx.doi.org/10.1093/treephys/22.12.869
URIhttp://hdl.handle.net/10261/99627
DOI10.1093/treephys/22.12.869
Identifiersissn: 0829-318X
Appears in Collections:(EEAD) Artículos
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