Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Euphytica 57-67 Coffea arabica Hemileia vastatrix Orange leaf rust Partial resistance Molecular markers 2009 fdi:010046005 ENG Euphytica 0014-2336 ISI:000264833400006 1 10.1007/s10681-008-9860-9 https://www.documentation.ird.fr/hor/fdi:010046005 https://www.documentation.ird.fr/intranet/publi/2009/04/010046005.pdf 167 Horizon (IRD) The objective of this study was to identify polymorphic molecular markers associated with partial resistance to coffee leaf rust, Hemileia vastarix. A segregating F (2) population derived from a cross between the susceptible Coffea arabica cv. Caturra and a C. canephora-introgressed Arabica line exhibiting high partial resistance was analyzed. Rust resistance measured as rust incidence (RI) and defoliation (DEF) was evaluated in field conditions in three consecutive years (2003-2005). During the 2003 season, which was characterized by favorable conditions for a rust epidemic, the F (2) plants exhibited different levels of resistance ranging from very susceptible (50.1% for DEF and 49.5% for RI) to highly partial resistance (9.1% for DEF and 3.7% for RI). Molecular analysis enabled identification of seven polymorphic markers (5 AFLP and 2 SSR) exhibiting significant association with partial resistance. Coexistence of resistance homozygous alleles (RR) at codominant SSR loci was correlated with high resistance. This study is the first attempt to develop PCR-based sequence specific markers linked to partial rust resistance in coffee. 076 UR186 Colombie