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A major quantitative trait allele for resistance to the Sugarcane yellow leaf virus ( Luteoviridae )
Author(s) -
Costet Laurent,
Raboin LouisMarie,
Payet Magali,
D’Hont Angélique,
Nibouche Samuel
Publication year - 2012
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2012.02003.x
Subject(s) - biology , germplasm , plant disease resistance , allele , quantitative trait locus , genotype , cultivar , genetics , botany , gene
With 1 figure and 1 tableAbstract The yellow leaf disease of sugarcane is distributed worldwide and causes important yield losses. This disease is caused by a member of the Luteoviridae family, the Sugarcane yellow leaf virus (SCYLV). The objective of this study was to characterize genetic factors for resistance to yellow leaf disease in a sugarcane clone resistant to infection by SCYLV. We analysed a progeny of 196 clones obtained from a cross between the susceptible cultivar ‘R570’ and the resistant cultivar ‘MQ76‐53’. This progeny was assessed for virus incidence using tissue‐blot immunoassay after 10 years of cultivation under natural infection conditions. The progeny was genotyped with various types of molecular markers resulting in 2822 polymorphic markers. Marker/trait association analysis revealed that SCYLV resistance in ‘MQ76‐53’ is controlled by Ryl 1, a major quantitative trait allele (QTA) accounting for 32% of the phenotypic variance. Ryl 1 is the first major QTA described to control a viral disease in sugarcane, and ‘MQ76‐53’ can already be used to introgress SCYLV resistance derived from Ryl 1 in elite germplasm.