Genotypic and environmental variation in autumn-sown onions

Fennell, J. F. M.; Salter, P. J.

doi:10.1007/bf00306058

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…Autumn-sown bulb onions are now an established feature of commercial onion growing in the UK, providing a supply of home-grown onions in the June to August period. Several workers (Tucker & Hough, 1973;Salter & James, 1975;Fennell &Salter, 1977 andFennell &Dowker, 1979) have shown that Japanese cultivars overwinter better and are more boltingresistant than European varieties which in general have been bred for spring sowing. The major disadvantage of the Japanese cultivars is their bulb quality which compares poorly with the main European cultivars in respect of skin retention, colour, bulb shape and keeping properties.…”

Section: Introductionmentioning

confidence: 99%

“…The major disadvantage of the Japanese cultivars is their bulb quality which compares poorly with the main European cultivars in respect of skin retention, colour, bulb shape and keeping properties. The studies of Fennell & Salter (1977) and Fennell & Dowker (1979) revealed a large amount of variation between the many accessions screened, but the authors concluded that a breeding programme would be necessary to produce an acceptable autumn sown cultivar suitable for the UK which combined the early maturity, winter hardiness and bolting resistance of the best Japanese cultivars with improved bulb quality.…”

Section: Introductionmentioning

confidence: 99%

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Trialling techniques in the breeding and prediction of recombinant inbred lines in onions (Allium cepa)

Werner

Dowker

DeSOUZA

et al. 1988

Annals of Applied Biology

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An outline is given of a novel breeding scheme for onions to produce highly vigorous, good quality inbred lines adapted for autumn-sowing in the UK. The scheme involves the production of advanced generation inbred lines in the absence of selection, by single seed descent, starting with 1500 F2 plants from a Japanese x European cross. Concurrently a genetical analysis designed to predict the range of recombinant inbred lines derivable from this cross has been conducted using triple test cross (TTC) and basic generation (BG) families. Four trials are described, the results of which are used to define trialling techniques for the TTC and BG material which enable genetical predictions to be applied to direct-drilled onions at commercial spacings. The ranking of genotypes for important agronomic characters remains unchanged whether they are grown as transplanted spaced single plants or direct-drilled, however interactions may occur if pre-chitted seed is used.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Trialling techniques in the breeding and prediction of recombinant inbred lines in onions (Allium cepa)

Werner

Dowker

DeSOUZA

et al. 1988

Annals of Applied Biology

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“…location and years), but is most useful if the interaction with genotypes has only one compo nent (9,16,19). Although the validity of this approach has been debated on statistical (11) and biological (12,15) grounds, it nevertheless has proven useful in breeding programs with many crops (6,7,8,16,18).…”

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confidence: 99%

Evaluation of Muskmelon Cultivar Performance by Joint Regression Analysis1

McClurg

Angell

et al. 1980

J. Amer. Soc. Hort. Sci.

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Data from 2 experiments, each involving a set of 6 muskmelon cultivars grown over a period of 4 years, were subjected to joint regression analysis to characterize performance across environments. ‘Burpee’ and ‘Gold Star’ were common to both experiments. A majority of the cultivars exhibited linear response for yield but not for fruit characteristics. There were also significant differences in regression coefficients among cultivars in each experiment. ‘Burpee’ and ‘Gold Star’ each had similar joint regression coefficients in both experiments for total weight of fruit per plant, but not for total number of fruit.

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Procedures for identifying S-allele genotypes of Brassica

Wallace

1979

Theoret. Appl. Genetics

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Procedures are described for efficient selection of: (1) homozygous and heterozygous S-allele genotypes; (2) homozygous inbreds with the strong self- and sib-incompatibility required for effective seed production of single-cross F1 hybrids; (3) heterozygous genotypes with the high self- and sib-incompatibility required for effective seed production of 3- and 4-way hybrids.From reciprocal crosses between two first generation inbred (I1) plants there are three potential results: both crosses are incompatible; one is incompatible and the other compatible; and both are compatible. Incompatibility of both crosses is useful information only when combined with data from other reciprocal crosses. Each compatible cross, depending on whether its reciprocal is incompatible or compatible, dictates alternative reasoning and additional reciprocal crosses for efficiently and simultaneously identifying: (A) the S-allele genotype of all individual I1 plants, and (B) the expressions of dominance or codominance in pollen and stigma (sexual organs) of an S-allele heterozygous genotype. Reciprocal crosses provide the only efficient means of identifying S-allele genotypes and also the sexual-organ x S-allele-interaction types.Fluorescent microscope assay of pollen tube penetration into the style facilitates quantitation within 24-48 hours of incompatibility and compatibility of the reciprocal crosses. A procedure for quantitating the reciprocal difference is described that maximizes informational content of the data about interactions between S alleles in pollen and stigma of the S-allele-heterozygous genotype.Use of the non-inbred Io generation parent as a 'known' heterozygous S-allele genotype in crosses with its first generation selfed (I1) progeny usually reduces at least 7 fold the effort required for achieving objectives 1, 2, and 3, compared to the method of making reciprocal crosses only among I1 plants.Identifying the heterozygous and both homozygous S-allele genotypes during the I1 generation facilitates, during subsequent inbred generations, strong selection for or against modifier genes that influence the intensity of self- and sib-incompatibility. Selection for strong self and sib incompatibility can be effective for both homozygous inbreds and also for the S-allele heterozygote, thus facilitating production of single-cross F1 hybrids and also of 3-and 4-way hybrids.

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Genotypic and environmental variation in autumn-sown onions

Cited by 4 publications

References 5 publications

Trialling techniques in the breeding and prediction of recombinant inbred lines in onions (Allium cepa)

Trialling techniques in the breeding and prediction of recombinant inbred lines in onions (Allium cepa)

Evaluation of Muskmelon Cultivar Performance by Joint Regression Analysis1

Procedures for identifying S-allele genotypes of Brassica

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