Responses of Arabidopsis thaliana to bicarbonate-induced iron deficiency |
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| Authors: | Najoua Msilini Houneida Attia Najoua Bouraoui Sabah M’rah Riadh Ksouri Mokhtar Lachaal and Zeineb Ouerghi |
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| Institution: | (1) Unité de Physiologie et de Biochimie de la Tolérance au Sel chez les Plantes, Faculté des Sciences de Tunis, Campus Universitaire, 2092 Tunis, Tunisia;(2) Laboratoire d’Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologies de la Technopole de Borj-Cédria (CBBC), BP 901, 2050 Hammam-Lif, Tunisia;(3) Physiologie et de Biochimie de la Tolérance au Sel chez les Plantes, Faculté des Sciences de Tunis, Campus Universitaire, 2092 Tunis El Manar, Tunisia |
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| Abstract: | Morpho-physiological and biochemical responses of Arabidopsis thaliana (accession N1438) to bicarbonate-induced iron deficiency were investigated. Plants were grown in cabinet under controlled
conditions, in a nutrient solution containing 5 μM Fe, added or not with 10 mM NaHCO3. After 30 days, bicarbonate-treated plants displayed significantly lower biomass, leaf number and leaf surface area as compared
to control plants, and slight yellowing of their younger leaves was observed. Potassium (K+) content was not modified by bicarbonate treatment in roots, whereas it was significantly diminished in shoots. Their content
in ferrous iron (Fe2+) and in leaf total chlorophylls was noticeably lower than in control plants. Root Fe(III)-chelate reductase and phosphoenolpyruvate
carboxylase (PEPC) activities were significantly enhanced, but leaf ribulose 1.5-bisphosphate carboxylase (Rubisco) activity
was decreased. |
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| Keywords: | Arabidopsis thaliana Bicarbonate Fe(III)-chelate reductase Iron chlorosis PEPC (EC 4 1 1 31) Rubisco (EC 4 1 1 39) |
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