The localization of eceriferum loci in barley V. Three point tests of genes on chromosome 1 and 3 in barley

Søgaard, Bodil

doi:10.1007/bf02906710

Cited by 10 publications

(11 citation statements)

References 19 publications

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“…The coefficient of coincidence was O38 agreeing with previous results based on recombinations among the three loci: cer-zd, uz, and cer-zn (Søgaard 1977). Although the number of expected plants in many cases was too low to calculate a correctly distributed x2-value, x2-values were calculated to test the two-gene ratios expected at the recoinbination frequencies estimated (table 4).…”

Section: Tablesupporting

confidence: 88%

“…In this two-point test C-banding made it possible to separate the double heterozygous type (AaBb) into two, viz, that derived from non-crossover gametes (AB/ab) and that derived from crossover gametes (Ab/aB). The recombination frequency between loci cer-zd and uz (table 4, cross 6) was significantly smaller than that (12'S cm -1 2'2 per cent) reported by Søgaard (1977) whereas the recombination frequencies between loci uz and cer-zn (table 4, cross 10) and between loci cer-zd and cer-zn (cross 8) agreed with her values (17.2 cm -166 per cent and 29'7 cm -26'6 per cent). The size of the three recombination frequencies is in accordance with the order cer-zd, uz, cer-zn of the three loci.…”

Section: Tablecontrasting

confidence: 53%

“…In combination, these things suggest (a) that as in many other organisms, crossing-over and recombination are virtually confined to the distal half of this chromosome arm, and (b) that the centromeric area on the linkage map corresponds to a major part of the proximal chromosome segment on the "cytological" map. In accordance with this, linkage studies using translocations place locus cer-zd in "the centromere area" and locus ert-c, closely linked with, but distal to, cer-zd (Søgaard, 1977), "near the centromere" (Persson, 1969a, b).…”

Section: Discussionmentioning

confidence: 81%

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Linkage map of the long arm of barley chromosome 3 using C-bands and marker genes

Linde‐Laursen

1982

Heredity

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SUMMARYThe long arm of barley chromosome 3 can be divided into four segments by three C-band locations. From the centromere the segments comprise 4 per cent, 26 per cent, 34 per cent, and 36 per cent of the arm length. The segregation of 114 F2-plants showed a 1:2: 1-ratio for C-bands at the three locations. No recombination was observed between the two proximal C-band locations whereas the two distal locations recombined with a frequency of 12±2 per cent. The three C-band locations were linked with loci cer-zd, uz, and cer-zn, but not with the tightly linked loci Est-1 and Est-4. The order of and distance (in per cent rec.) among the three cytological markers and the three marker gene loci were: 3l1-<1 per cent -312-2± 1 per cent-cer-zd-2±1 per cent-uz -8±2 per cent-313-16±3 per cent-cer-zn. A comparison of cytological distances and linkage values suggests that recombination is virtually confined to the distal half of this chromosome arm. In addition, C-bands at one location on chromosomes 6 and 7, respectively, segregated in 1 :2: 1-ratios. The C-band location on chromosome 6 and the Amy-i locus were linked with a recombination percentage of 23 3 per cent. The usefulness of multiple marker stocks is discussed.

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Section: Tablesupporting

confidence: 88%

Section: Tablecontrasting

confidence: 53%

Section: Discussionmentioning

confidence: 81%

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Linkage map of the long arm of barley chromosome 3 using C-bands and marker genes

Linde‐Laursen

1982

Heredity

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“…Each of these double (15). The crossover frequencies were calculated by the maximum likelihood method (1,3) as well as by the method used in earlier work for estimation of crossover classes from first principle (15).…”

Section: Cer-t 22 Cer-zf ~ Ari-e ~ Cer-zf 8 Lax-a ~ Cer-zj ~8 Cer-mentioning

confidence: 99%

“…After these 3 rejections the three point tests were satisfactory to the criteria used by JENSEN & HELMS JORGENSEN (5) for consistent mapping. One way of testing the reliability of the classification is offered by the approximate method applied by SOGAARD (15). The observed frequency distribution of the 27 genotypes in a three point test can be compared with the distribution expected from first principle.…”

Section: 7•mentioning

confidence: 99%