title: The memory of iron stress in strawberry plants.
abstract: To provide information towards optimization of strategies to treat Fe deficiency, experiments were conducted to study the responses of Fe-deficient plants to the resupply of Fe. Strawberry (Fragaria × ananassa Duch.) was used as model plant. Bare-root transplants of strawberry (cv. 'Diamante') were grown for 42 days in Hoagland's nutrient solutions without Fe (Fe0) and containing 10 μM of Fe as Fe-EDDHA (control, Fe10). For plants under Fe0 the total chlorophyll concentration of young leaves decreased progressively on time, showing the typical symptoms of iron chlorosis. After 35 days the Fe concentration was 6% of that observed for plants growing under Fe10. Half of plants growing under Fe0 were then Fe-resupplied by adding 10 μM of Fe to the Fe0 nutrient solution (FeR). Full Chlorophyll recovery of young leaves took place within 12 days. Root ferric chelate-reductase activity (FCR) and succinic and citric acid concentrations increased in FeR plants. Fe partition revealed that FeR plants expressively accumulated this nutrient in the crown and flowers. This observation can be due to a passive deactivation mechanism of the FCR activity, associated with continuous synthesis of succinic and citric acids at root level, and consequent greater uptake of Fe.
authors.affiliation: MeditBio - Center for Mediterranean Bioresources and Food, University of Algarve, FCT, Ed8, Campus of Gambelas, 8005-139, Faro, Portugal. Electronic address: fmgama@ualg.pt.
authors.forename: Florinda
authors.initials: F
authors.lastname: Gama
authors.affiliation: MeditBio - Center for Mediterranean Bioresources and Food, University of Algarve, FCT, Ed8, Campus of Gambelas, 8005-139, Faro, Portugal.
authors.forename: Teresa
authors.initials: T
authors.lastname: Saavedra
authors.affiliation: MeditBio - Center for Mediterranean Bioresources and Food, University of Algarve, FCT, Ed8, Campus of Gambelas, 8005-139, Faro, Portugal.
authors.forename: José Paulo
authors.initials: JP
authors.lastname: da Silva
authors.affiliation: MeditBio - Center for Mediterranean Bioresources and Food, University of Algarve, FCT, Ed8, Campus of Gambelas, 8005-139, Faro, Portugal.
authors.forename: Maria Graça
authors.initials: MG
authors.lastname: Miguel
authors.affiliation: LEAF - Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda, 1349-017, Lisbon, Portugal.
authors.forename: Amarilis
authors.initials: A
authors.lastname: de Varennes
authors.affiliation: MeditBio - Center for Mediterranean Bioresources and Food, University of Algarve, FCT, Ed8, Campus of Gambelas, 8005-139, Faro, Portugal.
authors.forename: Pedro José
authors.initials: PJ
authors.lastname: Correia
authors.affiliation: MeditBio - Center for Mediterranean Bioresources and Food, University of Algarve, FCT, Ed8, Campus of Gambelas, 8005-139, Faro, Portugal.
authors.forename: Maribela
authors.initials: M
authors.lastname: Pestana
mesh_terms: D018533:Biomass; D002734:Chlorophyll / Q000378:metabolism; D038181:FMN Reductase / Q000378:metabolism; D031985:Fragaria / Q000187:drug effects / Q000502:physiology*; D007501:Iron / Q000633:toxicity*; D009928:Organ Specificity / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000502:physiology; D018517:Plant Roots / Q000187:drug effects / Q000201:enzymology; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D002734:Chlorophyll; D007501:Iron; D038181:FMN Reductase; C023903:ferric citrate iron reductase
keywords: Fragaria ananassa; Iron deficiency; Nutrients; Organic acids; Recovery