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QTL analysis of early stage heterosis for biomass in Arabidopsis.


ABSTRACT: The main objective of this study was to identify genomic regions involved in biomass heterosis using QTL, generation means, and mode-of-inheritance classification analyses. In a modified North Carolina Design III we backcrossed 429 recombinant inbred line and 140 introgression line populations to the two parental accessions, C24 and Col-0, whose F (1) hybrid exhibited 44% heterosis for biomass. Mid-parent heterosis in the RILs ranged from -31 to 99% for dry weight and from -58 to 143% for leaf area. We detected ten genomic positions involved in biomass heterosis at an early developmental stage, individually explaining between 2.4 and 15.7% of the phenotypic variation. While overdominant gene action was prevalent in heterotic QTL, our results suggest that a combination of dominance, overdominance and epistasis is involved in biomass heterosis in this Arabidopsis cross.

SUBMITTER: Meyer RC 

PROVIDER: S-EPMC2793381 | biostudies-literature | 2010 Jan

REPOSITORIES: biostudies-literature

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QTL analysis of early stage heterosis for biomass in Arabidopsis.

Meyer Rhonda Christiane RC   Kusterer Barbara B   Lisec Jan J   Steinfath Matthias M   Becher Martina M   Scharr Hanno H   Melchinger Albrecht E AE   Selbig Joachim J   Schurr Ulrich U   Willmitzer Lothar L   Altmann Thomas T  

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik 20100101 2


The main objective of this study was to identify genomic regions involved in biomass heterosis using QTL, generation means, and mode-of-inheritance classification analyses. In a modified North Carolina Design III we backcrossed 429 recombinant inbred line and 140 introgression line populations to the two parental accessions, C24 and Col-0, whose F (1) hybrid exhibited 44% heterosis for biomass. Mid-parent heterosis in the RILs ranged from -31 to 99% for dry weight and from -58 to 143% for leaf a  ...[more]

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