| lactuca saligna, a non-host for lettuce downy mildew ( bremia lactucae), harbors a new race-specific dm gene and three qtls for resistance. | lactuca sativa (lettuce) is susceptible to bremia lactucae (downy mildew). in cultivated and wild lactuca species, dm genes have been identified that confer race-specific resistance. however, these genes were soon rendered ineffective by adaptation of the pathogen. lactuca saligna (wild lettuce) is resistant to all downy mildew races and can be considered as a non-host. therefore, l. saligna might be an alternative source for a more-durable resistance to downy mildew in lettuce. in order to anal ... | 2002 | 12582542 |
| three combined quantitative trait loci from nonhost lactuca saligna are sufficient to provide complete resistance of lettuce against bremia lactucae. | the nonhost resistance of wild lettuce (lactuca saligna) to downy mildew (bremia lactucae) is based on at least 15 quantitative trait loci (qtl), each effective at one or more plant developmental stages. we used qtl pyramiding (stacking) to determine how many of these qtl from l. saligna are sufficient to impart complete resistance towards b. lactucae to cultivated lettuce, l. sativa. the alleles of four of the most promising qtl, rbq4, rbq5, rbq6+11, and rbq7 are effective at both the young and ... | 2009 | 19656050 |
| rin4 causes hybrid necrosis and race-specific resistance in an interspecific lettuce hybrid. | some inter- and intraspecific crosses may result in reduced viability or sterility in the offspring, often due to genetic incompatibilities resulting from interactions between two or more loci. hybrid necrosis is a postzygotic genetic incompatibility that is phenotypically manifested as necrotic lesions on the plant. we observed hybrid necrosis in interspecific lettuce (lactuca sativa and lactuca saligna) hybrids that correlated with resistance to downy mildew. segregation analysis revealed a sp ... | 2009 | 19855048 |
| evaluation of lettuce germplasm resistance to gray mold disease for organic cultivations. | this study was conducted to evaluate the resistance of 212 accessions of lettuce germplasm to gray mold disease caused by botrytis cinerea. the lettuce germplasm were composed of five species: lactuca sativa (193 accessions), l. sativa var. longifolia (2 accessions), l. sativa var. crispa (2 accessions), l. saligna (2 accessions), and l. serriola (1 accession); majority of these originated from korea, netherlands, usa, russia, and bulgaria. after 35 days of spray inoculation with conidial suspen ... | 2014 | 25288990 |