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Digitale Medien

Significance testing of a decrease in the R factor. The jacknife and Hamilton's R-factor ratio test applied to a case of a false minimum in crystallography (1981)

Thompson, D. M. ; Richardson, M. F. ; Rothstein, S. M.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 37 (1981), S. 227-228

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ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: The jackknife statistic and Hamilton's R-factor ratio test can both be applied to test the significance of a decrease in the R factor, and give similar results. In Hamilton's test, the form in which the hypothesis is cast may obscure the correct dimension of the hypothesis. This problem does not arise for the jackknife test.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0567739481000521

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Digitale Medien

The inheritance of genetic markers in microspore-derived plants of barley Hordeum vulgare L. (1991)

Thompson, D. M. ; Chalmers, K. ; Waugh, R. ; [weitere]

Springer

Theoretical and applied genetics 81 (1991), S. 487-492

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ISSN: 1432-2242

Schlagwort(e): Doubled haploids ; Microspore ; Isozymes ; RFLPs ; Barley

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Biochemical, molecular and morphological markers have been used to monitor the segregation of alleles at major gene loci in microspore-derived lines of four spring barley crosses and their parents. Significant deviations from the expected Mendelian ratios were observed for four of the ten markers studied in the cross. Distorted ratios were associated with loci located on chromosomes 4H and 6H. The differential transmission of alleles was in favour of the responsive parent (Blenheim) used in the anther culture studies. For the α-Amy-1 locus on chromosome 6H, the preferential transmission of Blenheim alleles was most pronounced in the haploid regenerants that were colchicine treated. These results are discussed in relation to the genetic control of androgenetic response in barley and with respect to the exploitation of another culture in barley improvement.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00219438

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Digitale Medien

Water-soluble proteins of mature barley endosperm: genetic control, polymorphism, and linkage with β-amylase and spring/winter habit (1991)

Forster, B. P. ; Thompson, D. M. ; Watters, J. ; [weitere]

Springer

Theoretical and applied genetics 81 (1991), S. 787-792

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ISSN: 1432-2242

Schlagwort(e): Water-soluble protein (WSP) ; Barley ; β Amylase ; Linkage ; Spring/winter habit

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Water-soluble proteins (WSP-2 and WSP-3) and β-amylase (β-AMY-1) were extracted from mature endosperms of 44 spring and 39 winter barley genotypes. The protein and enzyme isoforms were separated in isoelectric focusing gels with a pH gradient of 4–6.5. The Wsp-3 and β-Amy-1 loci were located to chromosomes 4H using the wheat/barley chromosome addition lines. Segregation analysis of F2 and doubled haploid populations showed Wsp-2 and β-Amy-1 to be tightly linked, with a map distance of 11 cMorgans. Isoforms of WSP-2 possessed similar pIs to that of WSP-3 and overlapping bands were observed in the gels. These bands segregated independently in F2 and doubled haploid populations, implying two unlinked genes. All three loci were found to be polymorphic: two alleles were detected at the Wsp-2 locus, three at Wsp-3 and two at β-Amy-1. The frequency of alleles at all three loci was found to be different in winter and spring genotypes. Spring genotypes possessed a wider range of phenotypes than winter genotypes. Spring and winter genotypes could be distinguished on the basis of WSP-3 and β- AMY-1 phenotypes. The linkage between Wsp-3 and β-Amy-1 loci and genes controlling spring/winter habit on chromosome 4H is discussed. It is concluded that Wsp-3 and β-Amy-1 can be used as genetic markers for spring/winter habit in barley genetic research and breeding.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00224991

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