Quantitative Trait Loci for Inflorescence Development in Arabidopsis thaliana

Genetics ◽  
2002 ◽  
Vol 160 (3) ◽  
pp. 1133-1151 ◽  
Author(s):  
Mark C Ungerer ◽  
Solveig S Halldorsdottir ◽  
Jennifer L Modliszewski ◽  
Trudy F C Mackay ◽  
Michael D Purugganan
Keyword(s):  
Arabidopsis Thaliana ◽  
Quantitative Trait ◽  
Evolutionary Ecology ◽  
Genetic Correlations ◽  
Inflorescence Development ◽  
Meristem Identity ◽  
Trait Locus ◽  
The Many ◽  
Developmental Traits ◽  
Mapping Populations

Abstract Variation in inflorescence development patterns is a central factor in the evolutionary ecology of plants. The genetic architectures of 13 traits associated with inflorescence developmental timing, architecture, rosette morphology, and fitness were investigated in Arabidopsis thaliana, a model plant system. There is substantial naturally occurring genetic variation for inflorescence development traits, with broad sense heritabilities computed from 21 Arabidopsis ecotypes ranging from 0.134 to 0.772. Genetic correlations are significant for most (64/78) pairs of traits, suggesting either pleiotropy or tight linkage among loci. Quantitative trait locus (QTL) mapping indicates 47 and 63 QTL for inflorescence developmental traits in Ler × Col and Cvi × Ler recombinant inbred mapping populations, respectively. Several QTL associated with different developmental traits map to the same Arabidopsis chromosomal regions, in agreement with the strong genetic correlations observed. Epistasis among QTL was observed only in the Cvi × Ler population, and only between regions on chromosomes 1 and 5. Examination of the completed Arabidopsis genome sequence in three QTL regions revealed between 375 and 783 genes per region. Previously identified flowering time, inflorescence architecture, floral meristem identity, and hormone signaling genes represent some of the many candidate genes in these regions.

Genotype-Environment Interactions at Quantitative Trait Loci Affecting Inflorescence Development in Arabidopsis thaliana

Genetics ◽  
2003 ◽  
Vol 165 (1) ◽  
pp. 353-365 ◽  
Author(s):  
Mark C Ungerer ◽  
Solveig S Halldorsdottir ◽  
Michael D Purugganan ◽  
Trudy F C Mackay
Keyword(s):  
Arabidopsis Thaliana ◽  
Quantitative Trait ◽  
Rank Order ◽  
Morphological Diversity ◽  
Inflorescence Development ◽  
High Resolution Mapping ◽  
Resolution Mapping ◽  
Trait Locus ◽  
Genomic Regions ◽  
Functional Capacities

Abstract Phenotypic plasticity and genotype-environment interactions (GEI) play a prominent role in plant morphological diversity and in the potential functional capacities of plant life-history traits. The genetic basis of plasticity and GEI, however, is poorly understood in most organisms. In this report, inflorescence development patterns in Arabidopsis thaliana were examined under different, ecologically relevant photoperiod environments for two recombinant inbred mapping populations (Ler × Col and Cvi × Ler) using a combination of quantitative genetics and quantitative trait locus (QTL) mapping. Plasticity and GEI were regularly observed for the majority of 13 inflorescence traits. These observations can be attributable (at least partly) to variable effects of specific QTL. Pooled across traits, 12/44 (27.3%) and 32/62 (51.6%) of QTL exhibited significant QTL × environment interactions in the Ler × Col and Cvi × Ler lines, respectively. These interactions were attributable to changes in magnitude of effect of QTL more often than to changes in rank order (sign) of effect. Multiple QTL × environment interactions (in Cvi × Ler) clustered in two genomic regions on chromosomes 1 and 5, indicating a disproportionate contribution of these regions to the phenotypic patterns observed. High-resolution mapping will be necessary to distinguish between the alternative explanations of pleiotropy and tight linkage among multiple genes.

Identification of quantitative trait loci controlling partial clubroot resistance in new mapping populations of Arabidopsis thaliana

2008 ◽  
Vol 117 (2) ◽  
pp. 191-202 ◽  
Author(s):  
Mélanie Jubault ◽  
Christine Lariagon ◽  
Matthieu Simon ◽  
Régine Delourme ◽  
Maria J. Manzanares-Dauleux
Keyword(s):  
Arabidopsis Thaliana ◽  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Clubroot Resistance ◽  
Trait Loci ◽  
Mapping Populations

From genotype to phenotype: unraveling the complexities of cold adaptation in forest trees

2003 ◽  
Vol 81 (12) ◽  
pp. 1247-1266 ◽  
Author(s):  
Glenn T Howe ◽  
Sally N Aitken ◽  
David B Neale ◽  
Kathleen D Jermstad ◽  
Nicholas C Wheeler ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Cold Adaptation ◽  
Cold Hardiness ◽  
Evolutionary Ecology ◽  
Genetic Correlations ◽  
Analytical Techniques ◽  
Future Research ◽  
Trait Loci ◽  
Bud Phenology

Adaptation to winter cold in temperate and boreal trees involves complex genetic, physiological, and developmental processes. Genecological studies demonstrate the existence of steep genetic clines for cold adaptation traits in relation to environmental (mostly temperature related) gradients. Population differentiation is generally stronger for cold adaptation traits than for other quantitative traits and allozymes. Therefore, these traits appear to be under strong natural selection. Nonetheless, high levels of genetic variation persist within populations. The genetic control of cold adaptation traits ranges from weak to strong, with phenological traits having the highest heritabilities. Within-population genetic correlations among traits range from negligible to moderate. Generally, bud phenology and cold hardiness in the fall are genetically uncorrelated with bud phenology and cold hardiness in the spring. Analyses of quantitative trait loci indicate that cold adaptation traits are mostly controlled by multiple genes with small effects and that quantitative trait loci × environment interactions are common. Given this inherent complexity, we suggest that future research should focus on identifying and developing markers for cold adaptation candidate genes, then using multilocus, multi allelic analytical techniques to uncover the relationships between genotype and phenotype at both the individual and population levels. Ultimately, these methods may be useful for predicting the performance of genotypes in breeding programs and for better understanding the evolutionary ecology of forest trees.Key words: association genetics, cold hardiness, dormancy, genecology, bud phenology, quantitative trait loci.

scholarly journals Quantitative trait locus for starvation resistance in an intercontinental set of mapping populations ofDrosophila melanogaster

Fly ◽  
2009 ◽  
Vol 3 (4) ◽  
pp. 247-252 ◽  
Author(s):  
Federico H. Gomez ◽  
Raquel Defays ◽  
Pablo Sambucetti ◽  
Alejandra C. Scannapieco ◽  
Volker Loeschcke ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Quantitative Trait ◽  
Starvation Resistance ◽  
Trait Locus ◽  
Mapping Populations

Robustness of QTLs across germplasm pools using a model quantitative trait

Genome ◽  
2009 ◽  
Vol 52 (1) ◽  
pp. 39-48 ◽  
Author(s):  
E. A. Lee ◽  
J. M. Staebler ◽  
C. Grainger ◽  
M. E. Snook
Keyword(s):  
Quantitative Trait ◽  
Zea Mays L ◽  
Gene Action ◽  
Inbred Lines ◽  
Genetic Knowledge ◽  
Genetic Studies ◽  
Trait Locus ◽  
Simplistic Model ◽  
Mapping Populations ◽  
Flavone Synthesis

Knowledge of the inheritance of C-glycosyl flavone synthesis in maize ( Zea mays L.) silk tissues has been acquired through detailed genetic studies involving primarily germplasm from the Corn Belt Dent race. To test the robustness of this genetic knowledge, we examined C-glycosyl flavone synthesis in a genetically distinct germplasm pool, popcorn. C-glycosyl flavone profiles and levels and the involvement of three specific genes/quantitative trait loci (p, pr1, and sm1) in C-glycosyl flavone synthesis were examined in popcorn germplasm representing at least two races and various diverse geographic regions. Twenty-four inbred lines and 23 hybrids involving these inbred lines and inbred line R17 were characterized for their flavone profiles and levels in silk tissues. Two F2 mapping populations were constructed to examine the involvement of p, pr1, and sm1 on C-glycosyl flavone synthesis. C-glycosyl flavone levels threefold higher than previously reported in Corn Dent Belt materials and a novel class of compounds were discovered. The gene action of sm1 was different, the functional p allele was not always dominant, and pr1 did not affect maysin synthesis. Based on this rather simplistic “model” quantitative trait, it appears that caution should be exercised when attempting to apply quantitative trait locus knowledge accumulated in one germplasm base to a germplasm base that is known to be distinctly unique.

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