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Identification and characterization of the MLO family in legume genomes

AutorRispail, Nicolas ; Rubiales, Diego
Fecha de publicaciónsep-2017
CitaciónInternational Conference Advances in grain legume breeding, cultivations and uses for a more competitive value-chain (2017)
ResumenPowdery mildew is one of the most widespread and damaging fungal pathogen of many crops including legumes. One of the most efficient and durable powdery mildew resistance mechanisms is conferred by homozygous recessive alleles at the mlo and er1 loci in barley and pea respectively. These efficient papilla-based penetration resistances are due to loss-of-function mutations in one MLO protein. This protein belongs to a highly conserved plant specific family of proteins that possess seventrans-membrane domains. Although the exact function of MLO is still not known, phylogenetic analysis classified MLO proteins in seven clades of which clades IV and V contained all MLO linked to powdery mildew susceptibility in monocots and dicots respectively. As a first step to exploit mlo-based resistance in other legume crops, we identified and characterised the Mlo gene family in eight legume species from different clades of the Papillionoideae sub-family in the frame of the LEGATO EU-project. This analysis revealed several evolutionary differences between tropical and temperate legume crops. Interestingly, legume genomes were shown to encode several clade IV and V MLO members that are potential candidates to confer resistance to powdery mildew in these species. In addition, several clade-specific motifs were identified in the MLO protein sequences as hallmark of each MLO clade. These motifs could be useful to identify additional clade V MLO members in non-sequenced legumes and to search for novel papilla-based penetration resistance sources in crops.
DescripciónTrabajo presentado en la International Conference Advances in grain legume breeding, cultivations and uses for a more competitive value-chain, celebrada en Novi Sad (Serbia) el 27 y 28 de septiembre de 2017.
URIhttp://hdl.handle.net/10261/167094
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