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Rombolà, A.D. et al.

Rombolà, Brüggemann, López-Millán, Tagliavini, Abadía, Marangoni, Moog,

Biochemical responses to iron deficiency in kiwifruit (Actinidia deliciosa).

A 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.[1]

References

Biochemical responses to iron deficiency in kiwifruit (Actinidia deliciosa). Rombolà, A.D., Brüggemann, W., López-Millán, A.F., Tagliavini, M., Abadía, J., Marangoni, B., Moog, P.R. Tree Physiol. (2002) [Pubmed]

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