Evolution under domestication involving disturbance of genic balance

Lester, R. N.

doi:10.1007/bf00022606

Cited by 34 publications

(20 citation statements)

References 21 publications

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“…Gene action and interaction: In terms of the predominant mode of gene action, our results mirror those of Burke et al (2002) and stand in stark contrast to the view that domestication is generally driven by recessive genetic changes (e.g., Ladizinsky 1985;Lester 1989). In fact, inspection of Figure 2D reveals a preponderance of nonrecessive QTL, suggesting that selection during domestication likely resulted in a rapid phenotypic response, as most of these QTL would have been at least g Indicates whether or not a given QTL was detected in the previous cultivated 3 wild sunflower QTL analysis .…”

Section: Discussionsupporting

confidence: 85%

Quantitative Trait Locus Analysis of the Early Domestication of Sunflower

2007

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Genetic analyses of the domestication syndrome have revealed that domestication-related traits typically have a very similar genetic architecture across most crops, being conditioned by a small number of quantitative trait loci (QTL), each with a relatively large effect on the phenotype. To date, the domestication of sunflower (Helianthus annuus L.) stands as the only counterexample to this pattern. In previous work involving a cross between wild sunflower (also H. annuus) and a highly improved oilseed cultivar, we found that domestication-related traits in sunflower are controlled by numerous QTL, typically of small effect. To provide insight into the minimum genetic changes required to transform the weedy common sunflower into a useful crop plant, we mapped QTL underlying domestication-related traits in a cross between a wild sunflower and a primitive Native American landrace that has not been the target of modern breeding programs. Consistent with the results of the previous study, our data indicate that the domestication of sunflower was driven by selection on a large number of loci, most of which had small to moderate phenotypic effects. Unlike the results of the previous study, however, nearly all of the QTL identified herein had phenotypic effects in the expected direction, with the domesticated allele producing a more crop-like phenotype and the wild allele producing a more wild-like phenotype. Taken together, these results are consistent with the hypothesis that selection during the post-domestication era has resulted in the introduction of apparently maladaptive alleles into the modern sunflower gene pool.

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Section: Discussionsupporting

confidence: 85%

Quantitative Trait Locus Analysis of the Early Domestication of Sunflower

2007

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“…Such was the case of the transition from the wild to cultivated agro-ecosystems. In support of this, as first noted by Darwin (1859), in domesticated plants, the domestication traits have a recessive genetic nature (Lester, 1989). Moreover, a lower genome-wide gene expression level was found for domesticated compared with wild transcripts as if slightly deleterious mutations due to hitchhiking (mostly loss-of-function or with reduced expression) have been accumulated in the domesticated pool.…”

Section: Discussionmentioning

confidence: 55%

Decreased Nucleotide and Expression Diversity and Modified Coexpression Patterns Characterize Domestication in the Common Bean

et al. 2014

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ORCID ID: 0000-0001-9598-3131 (R.P.)Using RNA sequencing technology and de novo transcriptome assembly, we compared representative sets of wild and domesticated accessions of common bean (Phaseolus vulgaris) from Mesoamerica. RNA was extracted at the first true-leaf stage, and de novo assembly was used to develop a reference transcriptome; the final data set consists of ;190,000 single nucleotide polymorphisms from 27,243 contigs in expressed genomic regions. A drastic reduction in nucleotide diversity (;60%) is evident for the domesticated form, compared with the wild form, and almost 50% of the contigs that are polymorphic were brought to fixation by domestication. In parallel, the effects of domestication decreased the diversity of gene expression (18%). While the coexpression networks for the wild and domesticated accessions demonstrate similar seminal network properties, they show distinct community structures that are enriched for different molecular functions. After simulating the demographic dynamics during domestication, we found that 9% of the genes were actively selected during domestication. We also show that selection induced a further reduction in the diversity of gene expression (26%) and was associated with 5-fold enrichment of differentially expressed genes. While there is substantial evidence of positive selection associated with domestication, in a few cases, this selection has increased the nucleotide diversity in the domesticated pool at target loci associated with abiotic stress responses, flowering time, and morphology.

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“…This could have been due to parents being heterozygous for prickliness. This could also have been due to atavism as observed by Lester (1989) where crosses between cultivars of S. melongena and S. aethiopicum Gilo group produced hybrids with characters similar to their respective ancestors, S. incanum and S. anguivi.…”

Section: Morphology Inheritance-f1 F2mentioning

confidence: 98%

Crossability and cytological studies in Solanum macrocarpon and Solanum linnaeanum (Solanaceae).

Bukenya

Carasco

1995

Euphytica

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Crossing experiments involving the various groups ofSolanum macrocarpon L. complex, including wild (dasyphyllum), semi-wild and cultivars produced fully fertile F1 and F2 hybrids. This confirmed earlier findings that these groups belong to the same biological species. S. macrocarpon complex and S. linnaeanum Hepper ex Jaeger are isolated by reproductive barriers. F1 and F2 hybrids between various groups of S, macrocarpon showed heterosis. F2 superior hybrids were isolated as candidates for the future breeding programmes. Most wild-type traits like prickliness, hairiness were dominant to those possessed by cultivars. Relatively resistant hybrids to pest attack were noted. S. macrocarpon complex and S. linnaeanum are diploids (2n = 24). The overall nature of the karyotype suggests that the two are related. The F1 hybrids between the cultivars of S. macrocarpon and the wild group (S.dasyphyllum) showed normal meiosis. A lack of isolating barriers confirmed that S. macrocarpon complex constitute a single biological species.

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Evolution under domestication involving disturbance of genic balance

Cited by 34 publications

References 21 publications

Quantitative Trait Locus Analysis of the Early Domestication of Sunflower

Quantitative Trait Locus Analysis of the Early Domestication of Sunflower

Decreased Nucleotide and Expression Diversity and Modified Coexpression Patterns Characterize Domestication in the Common Bean

Crossability and cytological studies in Solanum macrocarpon and Solanum linnaeanum (Solanaceae).

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