Chromosome rearrangements in the hexaploid oats

Ladizinsky, G.

doi:10.1038/hdy.1970.46

Cited by 26 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar to the situation among the variable strigosa forms, a considerable amount of chromosomal variation (translocations) was detected among wild and cultivated sativa oats (LADIZINSKY, 1970a) . Here also hybrids are almost fully fertile .…”

Section: A Murphyi Ladizmentioning

confidence: 76%

Notes on species delimination, species relationships and polyploidy in Avena L.

1971

View full text Add to dashboard Cite

On the combined evidence from morphology, ecology, and cytogenetics, seven species are recognized in the genus Avena L . 1 . A . clauda DUR ., 2 . A . ventricosa BAL . 3 . A . longiglumis DUR, 4. A . strigosa SCHREB ., 5 . A . magna MURPHY et TERR ., 6 . A . murphyi LADIZ . and 7 . A . sativa L . The first three species are wild diploids . The fourth is a diploid-tetraploid complex of wild forms, weeds and cultivars . The fifth and sixth are wild tetraploids and the seventh constitutes a hexaploid aggregate of wild forms, weeds and cultivated forms . A short morphological and ecological characterization is given to each species .The cytogenetic, ecological and morphological evidence available on the evolutionary divergence and on the genetic affinities between the seven species is reviewed and discussed . The conclusion in drawn that in A vena there are two independent developments of polyploidy : 1 . strigosa tetraploids, where the diploid background is well known ; 2 . the tetraploid-hexaploid of A . magna, A . murphyi and A . sativa (series Denticulatae) . Here the first two species apparently represent the general tetraploid background from which hexaploid A . sativa evolved . It is also argued that it is impossible to explain the morphology, ecology and cytology of series Denticulatae in terms of the known diploid species of Avena, and a yet missing hypothetical diploid ancestor was extrapolated .

show abstract

Section: A Murphyi Ladizmentioning

confidence: 76%

Notes on species delimination, species relationships and polyploidy in Avena L.

1971

View full text Add to dashboard Cite

show abstract

“…Difficulties have included a lack of sequence data, the large size and complexity of the genome [4], and instability of aneuploid mapping stocks. Unlike other common polyploids, colinearity among oat subgenomes is disrupted by numerous chromosomal rearrangements [5]–[9], thus diploid relatives have provided limited guidance for map construction. Prior genotyping in oat has relied heavily on DNA manipulation, hybridization, and size-discrimination [10]–[12], with heterogeneous results that are poorly integrated among different mapping populations.…”

Section: Introductionmentioning

confidence: 99%

SNP Discovery and Chromosome Anchoring Provide the First Physically-Anchored Hexaploid Oat Map and Reveal Synteny with Model Species

et al. 2013

View full text Add to dashboard Cite

A physically anchored consensus map is foundational to modern genomics research; however, construction of such a map in oat (Avena sativa L., 2n = 6x = 42) has been hindered by the size and complexity of the genome, the scarcity of robust molecular markers, and the lack of aneuploid stocks. Resources developed in this study include a modified SNP discovery method for complex genomes, a diverse set of oat SNP markers, and a novel chromosome-deficient SNP anchoring strategy. These resources were applied to build the first complete, physically-anchored consensus map of hexaploid oat. Approximately 11,000 high-confidence in silico SNPs were discovered based on nine million inter-varietal sequence reads of genomic and cDNA origin. GoldenGate genotyping of 3,072 SNP assays yielded 1,311 robust markers, of which 985 were mapped in 390 recombinant-inbred lines from six bi-parental mapping populations ranging in size from 49 to 97 progeny. The consensus map included 985 SNPs and 68 previously-published markers, resolving 21 linkage groups with a total map distance of 1,838.8 cM. Consensus linkage groups were assigned to 21 chromosomes using SNP deletion analysis of chromosome-deficient monosomic hybrid stocks. Alignments with sequenced genomes of rice and Brachypodium provide evidence for extensive conservation of genomic regions, and renewed encouragement for orthology-based genomic discovery in this important hexaploid species. These results also provide a framework for high-resolution genetic analysis in oat, and a model for marker development and map construction in other species with complex genomes and limited resources.

show abstract

“…Compared with other food crops, construction of a genetic linkage map through advanced molecular markers in cultivated oat has been constrained by several obstacles such as (i) polyploid nature and the presence of the large regions of repetitive DNA (Rines et al, 2006;Molnar et al, 2011); (ii) chromosome rearrangements such as intergenomic translocations (Ladizinsky, 1970;Jellen et al, 1994;Hayasaki et al, 2000;Linares et al, 2000;Sanz et al, 2010;Gutierrez-Gonzalez and Garvin, 2011); and (iii) occasional homeologous pairing during meiosis that can confound correct ordering of markers (Singh and Kolb. The occurrence of BYDV in a field is largely dependent on the activity of its vectors.…”

Section: Winter Forage Oat-breeding Objectivesmentioning

confidence: 99%

Improvement of Oat as a Winter Forage Crop in the Southern United States

2014

View full text Add to dashboard Cite

Oat (Avena sativa L.) is a cool season annual grass species produced for grain and forage in many countries. The majority of oat cultivars in the United States are spring types grown primarily for grain production. However, in the southern region of the United States, much of the oat production consists of winter types that are grown for grain or animal forage, and in some cases as a dual‐purpose crop. As with other small grain crops used for forage production, the improvement of grazing tolerance, forage yield, and forage quality have not been major goals in U.S. oat breeding programs even though oat forage is a rich source of protein, vitamin B1, phosphorus, iron, and other minerals. However, breeding and research efforts for oat have recently been revitalized because of increased awareness of the positive health benefits associated with oat consumed as a whole grain food. Strengthening the molecular approaches for forage oat breeding in the southern United States could have a large impact on cattle production systems and could increase the production area planted to oat. Although many of the molecular tools developed for the improvement of grain production could be applicable to winter forage oat breeding, the tools are currently an untapped resource within the forage breeding community. The objectives of this manuscript are to examine the production of forage oat, the current state of forage oat breeding, and how molecular tools could aid and strengthen the development of improved forage oat cultivars.

show abstract

Chromosome rearrangements in the hexaploid oats

Cited by 26 publications

References 7 publications

Notes on species delimination, species relationships and polyploidy in Avena L.

Notes on species delimination, species relationships and polyploidy in Avena L.

SNP Discovery and Chromosome Anchoring Provide the First Physically-Anchored Hexaploid Oat Map and Reveal Synteny with Model Species

Improvement of Oat as a Winter Forage Crop in the Southern United States

Contact Info

Product

Resources

About