Gene segregation in autotetraploids. II

Little, Thomas M.

doi:10.1007/bf02872438

Cited by 27 publications

(6 citation statements)

References 64 publications

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“…Although some previous reports have described the varieties Vertus, Marls Kabul and Sabilt as resistatit (Graham et al, 1977;Flood et al, 1978;Khan & Milton, 1978;Healc et al, 1979), results of the present study indicate that each contains only a proportion of resistant phenotypes. Autotetraploids exist iti one of five phenotypic forms (Lindstrom, 1936) and the cross-pollination of individuals from these forms results In further genotypic variation among segregants in the Fj and subsequent generations (Little, 1945(Little, , 1958. On this basis, Kehr et al (1972) suggested that lucerne varieties cannot rightly be termed resistant or suceptible to pathogens.…”

Section: Discussionmentioning

confidence: 99%

Variation in resistance to Verticillium wilt within seedling populations of some varieties of lucerne (Medicago sativa)

Latunde‐Dada

Lucas

1982

Plant Pathology

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Verticillium wilt was assessed in seedling populations of five lucerne varieties: Euver, Maris Kabul, Sabilt, Verneuil and Vertus. Visual assessments of disease severity in Vertus were compared with estimates of fungal biomass obtained by a maceration‐dilution plate method and glucosamine assays. Symptom severity correlated with the amounts of fungus present only at the lower disease ratings. In contrast, direct correlations were obtained between visually assessed disease severities and the chlorophyll contents of plant shoots. Wide variation in disease reaction type were found within populations of all five varieties and disease development was found to differ in two environments with differing temperatures. The significance of these variations is discussed in relation to the genetic background of the host and studies on the biochemical basis of resistance to Verticillium wilt.

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Section: Discussionmentioning

confidence: 99%

Variation in resistance to Verticillium wilt within seedling populations of some varieties of lucerne (Medicago sativa)

Latunde‐Dada

Lucas

1982

Plant Pathology

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“…Many of these challenges are greatly reduced when working with diploid material. Population sizes needed for mapping can be much smaller in diploids than in autotetraploids (Little, 1945, 1952). Genes that produce easily scored dominant phenotypes in diploids may become incompletely dominant at the tetraploid level.…”

Section: What Questions Must We Answer As We Develop This New System?mentioning

confidence: 99%

Reinventing Potato as a Diploid Inbred Line–Based Crop

et al. 2016

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The third most important food crop worldwide, potato (Solanum tuberosum L.) is a tetraploid outcrossing species propagated from tubers. Breeders have long been challenged by polyploidy, heterozygosity, and asexual reproduction. It has been assumed that tetraploidy is essential for high yield, that the creation of inbred potato is not feasible, and that propagation by seed tubers is ideal. In this paper, we question those assumptions and propose to convert potato into a diploid inbred line-based crop propagated by true seed. Although a conversion of this magnitude is unprecedented, the possible genetic gains from a breeding system based on inbred lines and the seed production benefits from a sexual propagation system are too large to ignore. We call on leaders of public and private organizations to come together to explore the feasibility of this radical and exciting new strategy in potato breeding.

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“…LITTLE (13,14), in two articles, has given a detailed and clear report on this subject, which deserves special mention here.…”

Section: Introductionmentioning

confidence: 99%

The inheritance of harsh leaves in tetraploid cocksfoot

Dijk

1964

Euphytica

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Research was conducted to study the inheritance of the characteristic 'dentated leaves' in the autotetraploid grass species Dactylis glomerata. From segregation ratios of inbred and crossbred populations the following conclusions can be drawn: 1. Harshness of leaves is a dominant character. Simplex plants have a dominant phenotype but are less strongly dentated than duplex plants. 2. From the figures obtained it cannot be established with certainty how many genes are involved in the character harshness of leaves. Most cases can be explained by assuming one dominant factor, possibly supplemented by minor genes. However, the existence of complementary factors is not excluded, while also a system of more factors with partial dominance is a possible explanation. 3. The figures can be best explained by including the occurrence of double reduction in the computations. However, it is not possible to establish the coefficient a with reliability.

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Gene segregation in autotetraploids. II

Cited by 27 publications

References 64 publications

Variation in resistance to Verticillium wilt within seedling populations of some varieties of lucerne (Medicago sativa)

Variation in resistance to Verticillium wilt within seedling populations of some varieties of lucerne (Medicago sativa)

Reinventing Potato as a Diploid Inbred Line–Based Crop

The inheritance of harsh leaves in tetraploid cocksfoot

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