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  • Hordeum  (4)
  • bulbous barley grass  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Chromosome elimination in Hordeum vulgare x H. bulbosum hybrids (1983)
    Springer
    Theoretical and applied genetics 66 (1983), S. 141-146 
    Details
    ISSN: 1432-2242
    Keywords: Hordeum ; Stable hybrids ; Chromosome elimination ; Chromosome stability ; Gene balance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The hybrid progeny from a stable amphidiploid of H. vulgare x H. bulbosum involving the cultivar ‘Vada’ and an unstable amphidiploid involving the cultivar ‘Emir’ were studied. The genotypes examined contained two genomes from ‘Vada’ or one from ‘Vada’ and one from ‘Emir’, with one or two genomes from H. bulbosum. Comparisons between the chromosome numbers in root-tips and anthers revealed that there was no chromosome elimination in most plants, whether there was one or two Vada genomes present. The one plant in which chromosome elimination was positively identified had ‘Emir’ as opposed to ‘Vada’ cytoplasm. It also had a high incidence of degraded or fragmented chromosomes in the PMCs. Differences in stability between a 27 chromosome plant and other hypotetraploids suggest that ‘Vada’ contains both elimination genes and elimination suppressor genes. Upon selfing, again irrespective of the number of ‘Vada’ genomes present, circa triploid hybrids gave rise to diploid H. vulgare offspring while hypotetraploids produced hybrid-like plants. These included diploids, triploids and tetraploids. There was evidence that suggested that H. vulgare as well as H. bulbosum chromosomes had been eliminated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265189
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  • 2
    Electronic Resource
    Electronic Resource
    Comparisons of the hybrids Hordeum chilensexH. vulgare, H. chilensexH. bulbosum, H. chilensexSecale cereale and the amphidiploid of H. chilensexH. vulgare (1985)
    Springer
    Theoretical and applied genetics 69 (1985), S. 519-522 
    Details
    ISSN: 1432-2242
    Keywords: Hordeum ; Secale ; Interspecific, intergeneric hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Diploid hybrids between Hordeum chilense and three other species, namely H. vulgare, H. bulbosum and Secale cereale, are described together with the amphidiploid of H. chilensexH. vulgare. Both the diploid hybrid and the amphidiploid of H. chilensexH. vulgare were chromosomally unstable, H. chilensexH. bulbosum was less so, while H. chilensexS. cereale was stable. Differential amphiplasty was found in all combinations. No homoeologous pairing was found in the Hordeum hybrids but in H. chilensexS. cereale there was chromosome pairing both within the two genomes and between the genomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00251097
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  • 3
    Electronic Resource
    Electronic Resource
    Chromosome elimination in Hordeum vulgare x H. bulbosum hybrids (1983)
    Springer
    Theoretical and applied genetics 66 (1983), S. 135-140 
    Details
    ISSN: 1432-2242
    Keywords: Hordeum ; Amphidiploids ; Chromosome elimination ; Chromosome stability ; Gene balance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Both diploid and tetraploid hybrids of Hordeum vulgare x H. bulbosum exhibit chromosome instability during plant development and generally lose the H. bulbosum chromosomes by the next generation. However an amphidiploid involving the cultivar ‘Vada’ was found to retain the bulbosum chromosomes through a sexual cycle. Comparisons were made between this stable amphidiploid and a second, unstable amphidiploid involving the cultivar ‘Emir’. At meiosis there was a wide range of chromosome numbers in the ‘Emir’ amphidiploid but only a narrow range in the ‘Vada’ amphidiploid. Degraded chromosomes were commonly found in the PMCs of the ‘Emir’ amphidiploid but none was found in the stable ‘Vada’ amphidiploid. The two amphidiploids were reciprocally crossed and the chromosome numbers of the progeny checked. The H. bulbosum chromosomes had been retained in many of the progeny and both triploid and tetraploid hybrids were found. It is proposed that a gene(s) exists in ‘Vada’ capable of preventing the elimination of bulbosum chromosomes from H. vulgare x H. bulbosum hybrids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265188
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  • 4
    Electronic Resource
    Electronic Resource
    Partial incompatibility in crosses between Hordeum vulgare L. and H. bulbosum L. (1976)
    Springer
    Euphytica 25 (1976), S. 671-678 
    Details
    ISSN: 1573-5060
    Keywords: Hordeum ; interspecific partial incompatibility ; haploids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Certain cultivars of Hordeum vulgare L. gave low seed set (average 〈30%) after pollination with H. bulbosum, while others consistently gave high seed set (average 〉80%). The reduced seed setting occurred in crosses with cultivars which had H. distichum var. laevigatum in their ancestry. The results show that the reduced setting is probably controlled by a single dominant gene. This finding is of particular importance to breeders concerned with the use of Vada or some of its high yielding derivatives for producing haploids by interspecific hybridization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041605
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  • 5
    Electronic Resource
    Electronic Resource
    Attempts to overcome partial incompatibility between Hordeum vulgare L. and H. bulbosum L. (1980)
    Springer
    Euphytica 29 (1980), S. 369-377 
    Details
    ISSN: 1573-5060
    Keywords: Hordeum vulgare ; barley ; Hordeum bulbosum ; bulbous barley grass ; interspecific cross ; incompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Partial incompatibility has already been reported between Hordeum vulgare and H. bulbosum during the course of doubled haploid production, and in this paper attempts to overcome the breeding barrier are described. The methods which seem to offer most success are those of environmental adjustments and the adoption of new genotypes of H. bulbosum. Further cultivars of H. vulgare exhibiting this phenomenon are also noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025135
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  • 6
    Electronic Resource
    Electronic Resource
    Plant regeneration from cultured embryos derived from Hordeum vulgare L. Pollinated with H. Bulbosum L. (1983)
    Springer
    Euphytica 32 (1983), S. 585-591 
    Details
    ISSN: 1573-5060
    Keywords: Hordeum vulgare ; barley ; Hordeum bulbosum ; bulbous barley grass ; embryo culture ; haploids ; hybrids ; plant regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Plant regeneration rates from embryos derived from Hordeum vulgare x H. bulbosum were recorded over a 3 1/2 year period. % total plant regeneration (haploids + VB hybrids) varied to some extent but did not seem to be influenced by season or male parent. % VB production (and thus chromosome elimination) was however markedly affected by season and the genotype of the pollinator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021471
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  • 7
    Electronic Resource
    Electronic Resource
    The assessment of variation in two populations of Hordeum bulbosum L. for improving success rates in a doubled haploid barley programme (1983)
    Springer
    Euphytica 32 (1983), S. 903-910 
    Details
    ISSN: 1573-5060
    Keywords: Hordeum vulgare ; barley ; Hordeum bulbosum ; bulbous barley grass ; haploid embryos ; variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Improvements in the success of doubled haploid production have been achieved partly by screening new accessions of Hordeum bulbosum. In order to assess levels of variation within stocks of this species, rates of embryo differentiation from the cross between H. vulgare × H. bulbosum were recorded for selections derived from two different stocks of H. bulbosum. There was little difference within stocks for this character despite variation in the morphology and banding patterns of two enzyme systems of one of the stocks. It is proposed that to obtain further increases in success rates a few selections from many accessions of H. bulbosum should be screened rather than many selections from a few stocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042172
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