<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers "^^ . "Molecular-marker loci were used to investigate\r\nthe adaptation differences between highland and\r\nlowland tropical maize. An F2 population from the cross\r\nof two inbred lines independently derived from highland\r\nand lowland maize germplasm was developed, and extracted\r\nF3:4 lines were phenotype in replicated field trials\r\nat four thermally diverse tropical testing sites, ranging\r\nfrom lowland to extreme highland (mean growing season\r\ntemperature range 13.2–24.6°C). Traits closely related\r\nwith adaptation, such as biomass and grain yield, yield\r\ncomponents, days from sowing to male and female flowering,\r\ntotal leaf number, plant height and number of primary\r\ntassel branches (TBN), were analyzed. A large line\r\n´ environment interaction was observed for most traits.\r\nThe genetic basis of this interaction was reflected by significant,\r\nbut systematic, changes from lowland to highland\r\nsites in the correlation between the trait value and\r\ngenomic composition (designated by the proportion of\r\nmarker alleles with the same origin). Joint analysis of\r\nquantitative trait loci (QTLs) over sites detected 5–8\r\nQTLs for each trait (except disease scores, with data only\r\nfrom one site). With the exception of one QTL for\r\nTBN, none of these accounted for more than 15% of the\r\ntotal phenotypic variation. In total, detected QTLs accounted\r\nfor 24–61% of the variation at each site on average.\r\nFor yield, yield components and disease scores, alleles\r\ngenerally favored the site of origin. Highland-derived\r\nalleles had little effect at lowland sites, while lowland-\r\nderived alleles showed relatively broader adaptation.\r\nGradual changes in the estimated QTL effects with\r\nincreasing mean site temperature were observed, and\r\nparalleled the observed patterns of adaptation in high land and lowland germplasm. Several clusters of QTLs\r\nfor different traits reflected the relative importance in the\r\nadaptation differences between the two germplasm types,\r\nand pleiotropy is suggested as the main cause for the\r\nclustering. Breeding for broad thermal adaptation should\r\nbe possible by pooling genes showing adaptation to specific\r\nthermal regimes, though perhaps at the expense of\r\nreduced progress for adaptation to a specific site. Molecular\r\nmarker-assisted selection would be an ideal tool for\r\nthis task, since it could greatly reduce the linkage drag\r\ncaused by the unintentional transfer of undesirable traits"^^ . "1990" . . "99" . "7-8" . . "Springer Verlag"^^ . . . "TAG Theoretical and Applied Genetics"^^ . . . "14322242" . . . . . . . . . . . . . . . . . . . . . . "I"^^ . "Armstead"^^ . "I Armstead"^^ . . "G O"^^ . "Edmeades"^^ . "G O Edmeades"^^ . . "C"^^ . "Jiang"^^ . "C Jiang"^^ . . "M D"^^ . "Hayward"^^ . "M D Hayward"^^ . . "H R"^^ . "Lafitte"^^ . "H R Lafitte"^^ . . "D A"^^ . "Hoisington"^^ . "D A Hoisington"^^ . . . . . . "Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers (PDF)"^^ . . . . . "Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers (Other)"^^ . . . . . . "Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers (Other)"^^ . . . . . . "Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers (Other)"^^ . . . . . . "Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers (Other)"^^ . . . . . . "Genetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers (Other)"^^ . . . . . "HTML Summary of #5747 \n\nGenetic analysis of adaptation differences between highland and lowland tropical maize using molecular markers \n\n" . "text/html" . . . "Genetics and Genomics"@en . . . "Maize"@en . .