Abstract
AbstractDespite its abundance in the soil, Mg not only limits crop productivity and the quality of agricultural products, but also contributes to many chronic diseases in humans. This Mg deficiency is commonly observed in acid soils, lands of high rainfall and with high leaching activity, as well as agricultural soils with an unbalanced use of fertilizers (several Tunisian soils and irrigated areas …). Most authors suggested a critical Mg concentration for growth, photosynthesis, and the general plant functioning. However, some differential responses to this mineral constraint were observed among species, varieties, and genotypes but their origin is not yet elucidated. The present study focused on the response of two common bean (Phaseolus vulgaris L.) genotypes to Mg deficiency with a deep analysis of the link between growth, chlorophyll accumulation, photosynthetic process, and tissues Mg status. The main results emerging from this study is the close relationship between chlorophyll concentration, photosynthesis, plant growth, and tissue Mg concentration. Our results confirm the interdependence of these functions. The genotypic differences observed in this study are linked to the ability of the tolerant genotype to maintain a better allocation of Mg to shoots to support chlorophyll biosynthesis and photosynthesis and a better Mg use efficiency for these functions.
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