The productivity of sugar beet is strongly limited by several biotic stresses, among them rhizomania (induced by Beet necrotic yellow vein virus, BNYVV) which causes yield losses of 20–50% or more. The only way to control this disease is the use of resistant varieties. Sources of resistances have been found in the ancestor of the cultivated beets Beta vulgaris L. ssp. maritima (L.) Arcang. Rz1 is the major resistance gene present within commercial sugar beet varieties. This resistance was recognized as monogenic and dominant. Experimental evidence highlighted that Rz1 originated from sea beets belonging to Munerati’s genetic pool. The development of molecular markers linked to Rz1 allows the use of marker assisted selection (MAS) to introgress this gene into pollinator lines, to assess the trueness of hybridity and to remove off-type individuals. MAS speeds variety development and reduces production costs guaranteeing at the same time a high qualitative standard in variety development. Recent studies have shown an emergence of new BNYVV strains with increased virulence that could overcome Rz1 resistance. Therefore, exploitation of new genetic sources of resistance and the pyramiding of several resistance genes into new breeding lines is becoming a main priority for sugar beet breeding companies to maintain an adequate resistance level to rhizomania.
Sugar beet resistance to rhizomania: state of art and perspectives
STEVANATO, PIERGIORGIO;SACCOMANI, MASSIMO;
2011
Abstract
The productivity of sugar beet is strongly limited by several biotic stresses, among them rhizomania (induced by Beet necrotic yellow vein virus, BNYVV) which causes yield losses of 20–50% or more. The only way to control this disease is the use of resistant varieties. Sources of resistances have been found in the ancestor of the cultivated beets Beta vulgaris L. ssp. maritima (L.) Arcang. Rz1 is the major resistance gene present within commercial sugar beet varieties. This resistance was recognized as monogenic and dominant. Experimental evidence highlighted that Rz1 originated from sea beets belonging to Munerati’s genetic pool. The development of molecular markers linked to Rz1 allows the use of marker assisted selection (MAS) to introgress this gene into pollinator lines, to assess the trueness of hybridity and to remove off-type individuals. MAS speeds variety development and reduces production costs guaranteeing at the same time a high qualitative standard in variety development. Recent studies have shown an emergence of new BNYVV strains with increased virulence that could overcome Rz1 resistance. Therefore, exploitation of new genetic sources of resistance and the pyramiding of several resistance genes into new breeding lines is becoming a main priority for sugar beet breeding companies to maintain an adequate resistance level to rhizomania.
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