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  • 1
    Electronic Resource
    Electronic Resource
    Genetic analysis of the anther-culture response of three spring wheat crosses (1987)
    Springer
    Theoretical and applied genetics 74 (1987), S. 334-338 
    Details
    ISSN: 1432-2242
    Keywords: Triticum aestivum L. ; Haploid ; Regeneration ; Heritability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Anther-culture response was examined among three spring wheat (Triticum aestivum L.) cultivars to evaluate the genetic component of response and to determine whether androgenetic performance could be improved by selection. The three lines, the three possible F1's among the three lines, their F2's, and the backcrosses to the parents were evaluated for callus production and regeneration capacity. Significant variation was observed among the generations of the three crosses for callus formation. Genetic variation for regenerability was nonsignificant. Callus production was negatively correlated (-0.24) with regeneration capacity. The random variation in the study was too great to determine whether major-gene differences for antherculture response exist among the three lines by examining population distributions. When the material was evaluated for quantitative gene effects, the estimates for the additive gene effects were generally greater than the estimates for the dominance gene effects for callus formation. Only the Pavon x Chris cross, however, exhibited a significant narrow sense heritability estimate for callusing response (0.94). Due to the large component of random variation and the varying selection potential among crosses for androgenetic performance, improving anther-culture response in wheat by selection could prove difficult unless the anther-culture process itself selects for response traits at the gametic level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274715
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  • 2
    Electronic Resource
    Electronic Resource
    Mean levels and distribution of some risk factors for atherosclerosis in Sardinia: The ATS-Sardegna survey (1991)
    Springer
    European journal of epidemiology 7 (1991), S. 39-47 
    Details
    ISSN: 1573-7284
    Keywords: Atherosclerosis ; Blood pressure ; Cholesterol ; Lipoproteins ; Smoking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Six population samples of randomly chosen men and women aged 20–59 years in the four provinces of the island of Sardinia, for a total of 5,697 individuals (overall partecipation 55%), were examined to determine the mean levels and distribution of some risk factors for atherosclerosis. A remarkable uniformity of such levels, with some minor exceptions, was found throughout the island. The overall, age-standardized mean levels for the factors considered are as follows (men and women, respectively): total cholesterol (TC) (mg/dl) 204 and 196; LDL-cholesterol (LDL-C) (mg/dl) 131 and 125; apolipoprotein B (ApoB) (mg/dl) (five out of six areas) 112 and 104; HDL-cholesterol (HDL-C) (mg/dl) 48 and 53; triglyceride (TG) (mg/dl) 117 and 89; systolic blood pressure (mmHg) 129 and 128; diastolic blood pressure (mmHg) 81 and 80; body mass index (BMI) [kg/(m)2] 26 and 25; prevalence of smokers (%) 48 and 15; cigarettes per day among smokers 19 and 11. A regular increase with increasing age exists for TC, LDL-C, ApoB, blood pressure (systolic and diastolic) and BMI. Compared to the results of a previous survey eight years earlier, an unfavorable trend is in progress, particularly for TC levels in both sexes and smoking among women.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221340
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Vernalization of immature embryos of winter wheat genotypes (1987)
    Springer
    Euphytica 36 (1987), S. 161-165 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; winter wheat ; vernalization ; cold treatment ; immature embryos ; excised embryos ; embryo culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of direct vernalization of immature embryos on flowering was studied in six winter wheat genotypes. Fourteen-, 17-, and 20-day-old embryos were excised and vernalized for 0–6 weeks on synthetic medium during a conditioning period. Percent germination of embryos was high (overall 96.1%), and free from genotypic effects. Genotypes differed for flowering in response to cold treatment of excised embryos. Embryo vernalization was as effective as or more than conventional vernalization (control, seedling vernalization for 6 weeks). Seventeen-day-old embryos were the most responsive to vernalization. With a 5-week vernalization of 17-day-old embryos, the percentage of plants anthesed was higher than those from 14-and 20-day-old embryos. For 17-day-old embryos vernalized for 5 weeks, the mean number of days from culture to anthesis was less than that of 6 week vernalization, less than that of 14- and 20-day-old embryos, and less than controls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730659
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular characterization of a brown midrib3 deletion mutation in maize (1997)
    Springer
    Molecular breeding 3 (1997), S. 351-357 
    Details
    ISSN: 1572-9788
    Keywords: lignin ; bm3 ; maize ; O-methyltransferase ; PCR ; deletion ; brown midrib
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The caffeic acid O-methyltransferase (COMT) gene plays an important role in the synthesis of lignin. We have used the polymerase chain reaction in conjuction with genomic analysis to characterize deletion mutations of this gene in maize. In addition, we have analyzed and compared regions of the COMT gene from three distinct heterotic groups. Both PCR and Southern analysis indicate that the active wild-type COMT gene can be polymorphic. We suggest that the intron domain of at least one heterotic inbred can contribute to the alteration of the wild-type gene. In addition, multiple deletion mutations have occurred at this locus. We have found a previously uncharacterized deletion mutation in which segments of both the intron and exon have been deleted and replaced by other sequences. Precise knowledge of its sequence has allowed us to develop an assay by which we can follow this mutation in a breeding program.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009606422975
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    Paper (German National Licenses)
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