Effect of ferric deficiency on four bean varieties, in connection with the mode of nitrogen nutrition | Réponses de quatre variétés de haricot à la déficience ferrique, en rapport avec le mode de nutrition azotée
2003
Krouma, A. ((Institut National de Recherche Scientifique et Technique, Hammam Lif (Tunisie). Laboratoire d'Adaptation et d'Amélioration des Plantes)) | Abdelly, C. | Gharsalli, M. | Hajji, M.
Several studies suggest that the Fabaceae-Rhizobiaceae symbiosis is more senstitive to iron deficiency than NO3- dependent plant. The aim of this study, which is part of a screening program for common bean tolerance to Fe deficiency, was to explore the variability in Fe deficiency responses among 4 common bean lines: Coco widely cultivated in the Mediterranean regions, Striker both with white seeds, SVM-29-21 and ARA 14 with coloured seeds. Plants were dependent either on symbiotic nitrogen fixation (inoculation of seedlings with an efficient Rhizobium strain, CIAT 899) or on NO3- assimilation. For both patways of N nutrition, plant were grown on Fe-free medium (Plants - Fe) or solution supplied with 451 micro M Fe (Plants + Fe). The measured parameters were: DW of shoots, roots and nodules, number and size of nodules, leaf area and nitrogen and Fe 2+ contents of the above mentionned tissues. Results showed that Fe deficiency reduced growth of shoots and roots, decreased leaf expansion and induced a chlorosis more rapidly and more pronounced in N2 than NO3- dependent plants. In symbiotic plants, nodule development was also affected. Independently of N nutrition, Fe deficiency led to a decrease of Fe 2+ tissues contents particularly in roots and modified plant N nutrition. ARA 14 was more tolerant than the other lines under symbiotic or NO3- nutrition
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