An Interspecific Backcross of Lycopersicon Esculentum X L. Hirsutum: Linkage Analysis and a Qtl Study of Sexual Compatibility Factors and Floral Traits
AUTOR(ES)
Bernacchi, D.
RESUMO
A BC(1) population of the self-compatible tomato Lycopersicon esculentum and its wild self-incompatible relative L. hirsutum f. typicum was used for restriction fragment length polymorphism linkage analysis and quantitative trait loci (QTL) mapping of reproductive behavior and floral traits. The self-incompatibility locus, S, on chromosome 1 harbored the only QTL for self-incompatibility indicating that the transition to self-compatibility in the lineage leading to the cultivated tomato was primarily the result of mutations at the S locus. Moreover, the major QTL controlling unilateral incongruity also mapped to the S locus, supporting the hypothesis that self-incompatibility and unilateral incongruity are not independent mechanisms. The mating behavior of near-isogenic lines carrying the L. hirsutum allele for the S locus on chromosome 1 in an otherwise L. esculentum background support these conclusions. The S locus region of chromosome 1 also harbors most major QTL for several floral traits important to pollination biology (e.g., number and size of flowers), suggesting a gene complex controlling both genetic and morphological mechanisms of reproduction control. Similar associations in other flowering plants suggest that such complex may have been conserved since early periods of plant evolution or else reflect a convergent evolutionary process.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1208205Documentos Relacionados
- Cytogenetics of Interspecific Hybrids, Lycopersicon Esculentum Mill. x L. Hirsutum Humb. and Bonpl
- Linkage Analysis of Quantitative Traits in an Interspecific Cross of Tomato (Lycopersicon Esculentum X Lycopersicon Pimpinellifolium) by Means of Genetic Markers
- Genetic Control and Evolution of Sesquiterpene Biosynthesis in Lycopersicon esculentum and L. hirsutum
- Enhancing Linkage-Block Breakup following Interspecific Hybridization and Backcross Transference of Genes in Gossypium Hirsutum L
- Estimativa de parâmetros genéticos e correlação entre componentes de resistência à traça-do-tomateiro em progênies de Lycopersicon esculentum x L. hirsutum f. glabratum