Breeding structure of a highly selected cultivar of cabbage (Brassica oleracea var. Capitata)

Ockendon, D. J.; Currah, L.

doi:10.1038/hdy.1979.40

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…I have shown that, as the coefficient of relationship increases, the level of cross-compatibility between P. drummondii plants declines. This finding is consistent with results for other outcrossing species (e.g., Oenothera organensis [Emerson, 1938), Trifolium pratense [Williams, 1947), Papaver rhoeas [Lawrence, 1975), Brassica oleracea [Ockendon and Currah, 1979), and Calotis cuneifolia [Davidson and Stace, 1986)). The greater the relatedness of plants, the higher is the probability that they will share self-incompatibility alleles and then be partially or totally cross-incompatible.…”

Section: Discussionsupporting

confidence: 89%

PROXIMITY‐DEPENDENT CROSS‐COMPATIBILITY IN PHLOX

Levin

1989

Evolution

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Section: Discussionsupporting

confidence: 89%

PROXIMITY‐DEPENDENT CROSS‐COMPATIBILITY IN PHLOX

Levin

1989

Evolution

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“…In Brassica can'tpestris, on the other hand, which has the same genetic system of selfincompatibility, self-compatible plants have been found in natural populations with a frequency of 4.5 to 13.8 per cent, their occurrence being attributed to the effects of environment and/or genetic background other than the S-locus (Nou et al, 1993b). A wide range of variation in S-allele activity and mutual weakening of S-alleles in the self-incompatibility reaction have also been reported in other species of Brassica (Ockendon & Currah, 1979;Wallace, 1979). Secondly, a large number of S-alleles participates in the insect-mediated pollination of the diploid I. trfida, as a total of 49 different S-alleles was found in 224 plants from six natural populations (Table 2).…”

Section: Discussionmentioning

confidence: 99%

Number, frequency & dominance relationships of S-alleles in diploid Ipomoea trifida

et al. 1994

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Self-incompatibility genotypes of 224 plants of Ipomoea trifida from six populations in Central America have been determined by genetic analysis of segregants in F1 families derived from crosspollinations with the most recessive homozygote. A total of 49 different S-alleles was identified in these populations. From analyses of S-allelic interactions in heterozygous plants which were generated from cross-pollinations between plants possessing different S-alleles, a linear dominance hierarchy with six levels has been established among 28 S-alleles in both pollen and stigma.Codominance of alleles occurred more frequently in the stigma (9.2 per cent) than in the pollen (4.9 per cent). Nonlinear dominance relationships were rarely observed. Unequal frequencies of Salleles have been found in all populations examined, the most common S-allele being, as expected, the most recessive. This suggests that recessive S-alleles are widely distributed throughout Central America. The diversity of the multiple S-alleles observed in the present study also suggests that the southern area of Mexico to Guatemala is a centre of genetic variation in diploid I. trijIda.

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“…As expected, considerable overlap occurs between varieties in their S-allele constitutions (due to their recent common ancestry), but some differentiation has occurred, and the total number of different 5-alleles found in the four varieties combined is 49 (Ockendon, 1985). This is quite a large number bearing in mind that artificial selection and breeding is likely to have depleted the S-allele pool (Ockendon and Currah, 1979;Ockendon, 1974;1982).…”

Section: Discussionmentioning

confidence: 99%

The number, dominance relationships and frequencies of self-incompatibility alleles in a natural population of Sinapis arvensis L. in South Wales

Stevens

Kay

1989

Heredity

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The incompatibility genotypes of a further 25 plants from the South Wales population of Sinapis arvensis studied by Ford and Kay (1985) have been determined, and an additional 21 S-alleles have been found. This brings the overall number of plants analysed from the population to 35, and the total number of S-alleles found also to 35. It is estimated that there are 52 S-alleles in the population.Dominance interactions between S-alleles have been established in a total of 42 different heterozygotes (pooling data obtained during the present study with that of Ford and Kay (bc. cit.)). Co-dominance of alleles in both pollen and stigma occurred in 18 (42.8 per cent), dominance of one allele in the pollen occurred in 21(50 per cent), dominance of one allele in the stigma occurred in two (4.8 per cent), and dominance of one allele in both pollen and stigma occurred in one (2.4 per cent). There is a minimum of three levels in the pollen dominance hierarchy, and two in the stigma dominance hierarchy; dominance interactions between S-alleles in the stigma may be non-linear. There is some indication that pollen dominant alleles tend to be found in lower frequencies than pollen recessive alleles.Preliminary data show that at least some S-alleles in S. arvensis have a very wide geographical distribution.

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Breeding structure of a highly selected cultivar of cabbage (Brassica oleracea var. Capitata)

Cited by 9 publications

References 16 publications

PROXIMITY‐DEPENDENT CROSS‐COMPATIBILITY IN PHLOX

PROXIMITY‐DEPENDENT CROSS‐COMPATIBILITY IN PHLOX

Number, frequency & dominance relationships of S-alleles in diploid Ipomoea trifida

The number, dominance relationships and frequencies of self-incompatibility alleles in a natural population of Sinapis arvensis L. in South Wales

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