Evidence of the domestication history of flax (Linum usitatissimum L.) from genetic diversity of the sad2 locus

  title={Evidence of the domestication history of flax (Linum usitatissimum L.) from genetic diversity of the sad2 locus},
  author={Robin G. Allaby and Gregory W. Peterson and David A. Merriwether and Yong-Bi Fu},
  journal={Theoretical and Applied Genetics},
A phylogenetic analysis was conducted on 34 alleles of 2.5 kb sized stearoyl-ACP desaturase II (sad2), obtained from 30 accessions of cultivated and pale flax (Linum spp.), to elucidate the history of flax domestication. The analysis supports a single domestication origin for extant cultivated flax. The phylogenetic evidence indicates that flax was first domesticated for oil, rather than fibre. The genetic diversity of the sad2 locus in cultivated flax is low when compared to that of the pale… 

Genetic evidence for early flax domestication with capsular dehiscence

  • Yong-Bi Fu
  • Biology
    Genetic Resources and Crop Evolution
  • 2010
Findings strongly suggest that capsular dehiscence was among the first flax traits modified by human after initial domestication, reflecting the importance that reducing capsularDehiscent likely played in early flax domestication.

Genetic diversity of cultivated flax (Linum usitatissimum L.) and its wild progenitor pale flax (Linum bienne Mill.) as revealed by ISSR markers

Pale flax displayed more ISSR variation than landraces and dehiscent type, but less than winter type, of cultivated flax, while genetic distances among the pale flax accessions were significantly associated with their geographic distances and elevation differences.

Population-based resequencing revealed an ancestral winter group of cultivated flax: implication for flax domestication processes

  • Yong-Bi Fu
  • Biology, Medicine
    Ecology and evolution
  • 2012
The genetic relationships of 48 Linum samples representing pale flax and four trait-specific groups of cultivated flax are assessed through population-based resequencing at 24 genomic regions, and revealed a winter group of cultivated Flax that displayed close relatedness to its progenitor, paleflax.

The potential of pale flax as a source of useful genetic variation for cultivated flax revealed through molecular diversity and association analyses

It is demonstrated that pale flax is a potential source of novel variation to improve multiple traits in cultivated flax and that association mapping is a suitable approach to screening pale Flax germplasm to identify favorable quantitative trait locus alleles.

Locus-specific view of flax domestication history

A phylogenetic analysis of the sad2 locus in 43 pale and 70 cultivated flax accessions established a complex domestication history for flax that has not been observed previously, and supports multiple paths of flax domestication for oil-associated traits before selection of the other domestication- associated traits of seed dispersal loss and fiber production.

Genetic diversity of cultivated flax (Linum usitatissimum L.) germplasm assessed by retrotransposon-based markers

Findings provide a basis for better flax germplasm management, core collection establishment, and exploration of diversity in breeding, as well as for exploration of the role of retrotransposons in flax genome dynamics.

Genetic diversity analysis of a flax (Linum usitatissimum L.) global collection

To maximize genetic gain, hybridization between NDSU stock (P5 and Asian individuals (P6) are potentially the best option as genetic differentiation between them is highest (Fst’s> 0.50).

Potential Hybridization of Flax with Weedy and Wild Relatives: An Avenue for Movement of Engineered Genes?

Gen gene introgression from transgenic fl ax to wild rela- tives is possible in several species native to North America, depending on species distribution, sympatry, concurrent fl owering, ploidy level, and sexual compatibility.

Variation in phenotypic characters of pale flax (Linum bienne Mill.) from Turkey

Pale flax displayed larger variation in vegetative plant parts and growth habit than the cultivated flax and more heterogeneity within accessions, and a higher degree of variation was observed in many generative parts such as the flower characters than in the capsule and seed characters.



RAPD analysis of genetic relationships of seven flax species in the genus Linum L

Genotyped 12 flax accessionsrepresenting seven flax species in the genus Linum with 527 RAPD loci from 29 informative RAPD primers and analyzed their genetic relationships with simple matching, Dice's and Jaccard's similarity coefficients.

Variation of cultivated flax (Linum usitatissimum L. subsp.usitatissimum) and its wild progenitor pale flax (subsp.angustifolium (Huds.) Thell.)

Range of variation, genetically based variation, heritability and correlation of several characters are considered, especially with respect to the influence of domestication, and cultivated flax shows higher variation in the characters of generative plant parts, while pale flax varies more in the vegetative parts of the plant.

Genetic diversity within a range of cultivars and landraces of flax (Linum usitatissimum L.) as revealed by RAPDs

RAPDvariation was generally low and more variation was detected among, than within, the investigated flax accessions, and a trend was observed that the rate of loss in genetic variation in Canadian flax breeding programs over the last fifty years was approximately two variable loci per 100 lociper 10 years.

Most similar variety grouping for distinctness evaluation of flax and linseed (Linum usitatissimum L.) varieties by means of AFLP and morphological data

As further tested on a subset of 17 morphologically very similar varieties, AFLP marker data were able to reveal extra sources of genetic variation, which can be exploited in plant variety testing as an additional tool for determining the distinctness of new varieties that are morphologically difficult to differentiate.

Comparative evolutionary analysis of chalcone synthase and alcohol dehydrogenase loci in Arabidopsis, Arabis, and related genera (Brassicaceae).

We analyzed sequence variation for chalcone synthase (Chs) and alcohol dehydrogenase (Adh) loci in 28 species in the genera Arabidopsis and Arabis and related taxa from tribe Arabideae. Chs was

Sequence of a cDNA from Linum usitatissimum Encoding the Stearoyl-Acyl Carrier Protein Desaturase

A high degree of conservation was observed between the flax SAD and the SAD from castor, cucumber, and safflower, consistent with SAD being a soluble plastidic protein.

Isolation and characterization of two promoters from linseed for genetic engineering

The isolation and characterization of two linseed promoters from a two-member gene family encoding the enzyme stearoyl-acyl carrier protein desaturase (SAD) are reported, useful for manipulating the expression of indigenous as well as transgenes in linseed to create value-added cultivars.

Network analysis provides insights into evolution of 5S rDNA arrays in Triticum and Aegilops.

It is proposed that 5S rDNA arrays combine sequence conservation with a large store of mutant variations, the number of correct gene copies within an array being the result of neutral processes that act on gene and spacer regions together.

AFLP data and the origins of domesticated crops

The simulations showed that the population biology aspects of the domestication process can result in independently domesticated populations merging in such a way that a monophyletic origin is erroneously in- ferred when the resulting population is examined by AFLP genotyping and neighbor-joining analysis.

Studies on the Origin of Cultivated Plants

The great increase in genetical research and the marked desire of many geneticists to link their studies with other aspects of biology is leading to renewed interest in the taxonomic and geographical history of the authors' common cultivated plants.