Differential tolerance to lime-induced chlorosis of N2-fixing common bean (Phaseolus vulgaris L.).

摘要

Common bean (Phaseolus vulgaris L.) is one of the most important protein-rich crops in the Mediterranean regions. However, about one third of the planet's cultivated land is a calcareous soil in which iron availability is very low. Studies on the development of common bean varieties adapted to environmental constraints as existing in these regions are limited. This study was initiated to evaluate growth, nodulation and nitrogen and Fe nutrition in three N2-fixing common bean varieties. Seedlings were inoculated with an efficient strain of Rhizobium tropici CIAT 899 and were grown on non-calcareous or calcareous soil. In comparison to Coco blanc and BRB17, Flamingo develop a high level of whole plant and nodule growth and maintained an adequate photosynthetic activity and symbiotic nitrogen fixation on calcareous soil. The Fe use efficiency for nodule growth and nitrogen accumulation discriminate clearly Flamingo from the other varieties.