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Acta Biológica Colombiana

Print version ISSN 0120-548X


LOPEZ, CAMILO. Deciphering the Molecular Bases of Quantitative Resistance. Acta biol.Colomb. [online]. 2011, vol.16, n.2, pp.3-14. ISSN 0120-548X.

Plant pathogens are some of the most important factors affecting crop production. Classically two general types of plant resistance to pathogens have been recognized: i) complete, vertical or qualitative resistance governed by a single gene; and ii) incomplete, horizontal or quantitative resistance, which is governed by several genes. Although quantitative resistance provides broad spectrum and more durable resistance, the underlying molecular mechanism involved in pathogen recognition has not been deeply studied. In this review, we proposed a model to explain the molecular mechanism involved in the pathogen recognition during the quantitative resistance. This is based on the co-localization of similar classical qualitative resistance genes with QTL (Quantitative Trait Loci). In addition, information is presented about the progress made in the last three years towards understanding this complex resistance, which has culminated in the cloning of several quantitative resistance genes. Taken together these data provide new insights about this type of resistance and how we can use it for crop improvement.

Keywords : quantitative resistance; QRL; durable resistance; cloning.

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