Responses of two ecotypes of <Emphasis Type="Italic">Medicago ciliaris</Emphasis> to direct and bicarbonate-induced iron deficiency conditions |
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Authors: | Wissal M’sehli Marta Dell’Orto Patrizia De Nisi Silvia Donnini Chedly Abdelly Graziano Zocchi Mohamed Gharsalli |
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Institution: | (1) Laboratoire d’Adaptation des Plantes aux Stress Abiotiques (LAPSA), Centre de Biotechnologie, Technopole de BORJ-CEDRIA (CBBC), B.P. 901, 2050 Hammam-Lif, Tunisia;(2) Dipartimento di Produzione Vegetale, Universita di Milano, Via Celoria 2, 20133 Milan, Italy |
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Abstract: | Our study investigates the effect of iron deficiency on morpho-physiological and biochemical parameters of two Medicago ciliaris ecotypes (Mateur TN11.11 and Soliman TN8.7). Iron deficiency was imposed by making plants grow, either in an iron free or
by the addition of CaCO3/NaHCO3 to the Hoagland nutrient solution. Our results showed that both true and bicarbonate Fe-deficiency induced the characteristic
iron-chlorosis symptoms, although the intensity of the symptoms was ecotype-dependent. This variability in tolerance to iron
deficiency was also displayed by other morphological parameters such as root biomass and chlorophyll concentration. Besides,
iron chlorosis induced an increase in biochemical parameters: the iron reducing capacity (measured in vivo on root segments
and in vitro on plasma membrane enriched vesicles) and rhizosphere acidification by enhancement of H+-ATPase activity were more pronounced in Mateur ecotype. These findings suggest that Soliman ecotype was more sensitive than
Mateur one to iron chlorosis. |
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Keywords: | Fe(III)-chelate reductase H+-ATPase Iron deficiency Medicago ciliaris Variability |
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