Hybrid production in Lolium perenne based on incompatibility

Posselt, U. K.

doi:10.1007/bf00023464

Cited by 18 publications

(15 citation statements)

References 6 publications

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“…Cytoplasmic male sterility has been introduced from meadow fescue (Connolly & Wright-Turner 1984), but using it to produce F 1 hybrid seed is expensive and may not be economic. Using the two-locus incompatibility system to produce predominately F 1 hybrid seed by mixing two full-sib families at the final generation of seed production is another possibility (England 1974;Posselt 1993). In practice, however, it is difficult to find hybrids that perform better than a synthetic variety constructed from the same set of parental lines or clones.…”

Section: Classical Breeding Methodsmentioning

confidence: 99%

Progress in breeding perennial forage grasses for temperate agriculture

2003

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Wilkins, P. W., Humphreys, M. O. (2003). Progress in breeding perennial forage grasses for temperate agriculture. ? Journal of Agricultural Science, 140, (2), 129-150. Sponsorship: Germinal Holdings Ltd; Department for Agriculture, Food and Rural Affairs (DEFRA); Biotechnology and Biological Sciences Research Council (BBSRC)Breeding of temperate forage grasses is aimed at improving the economic and environmental sustainability of production from cattle and sheep. The primary objective is to ensure that forage can be the main source of feed for ruminants. This requires consistent production of herbage with a high feeding value, usually under nitrogen-limiting conditions. The most important traits affecting the feeding value of herbage are in vitro dry matter digestibility (DMD), the ratios of crude protein, water-soluble carbohydrate and fibre, and the concentration of alkaloid toxins. Improvements in these primary quality traits must be combined with good plant persistency, adequate tolerance to a range of environmental stresses, adequate resistance to a large number of different pathogens and invertebrate pests, and adequate seed yield. Forage grasses also have considerable potential to produce material for refining, to provide protein extracts for feeding to monogastric animals and carbohydrate for fermentation into fuel or into feedstocks for other industries.Peer reviewe

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Section: Classical Breeding Methodsmentioning

confidence: 99%

Progress in breeding perennial forage grasses for temperate agriculture

2003

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“…A method for hybrid development that would result in 83% F 1 hybrid seed based on the SI system was proposed by England (1974) and was employed by Posselt (1993). Additionally, the SI system can be exploited to develop different types of hybrid cultivars with varying degrees of parental control ranging from population hybrids to single cross-hybrids from heterozygous Han et al 2011Han et al , 2012.…”

Section: Discussionmentioning

confidence: 99%

Validation of two models for self‐incompatibility in autotetraploid perennial ryegrass using high resolution melting‐based markers

et al. 2014

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Perennial ryegrass (Lolium perenne L.) displays a two-locus gametophytic self-incompatibility (SI) system that remains intact at the tetraploid level. Two models are plausible for SI in autotetraploids. In Model I: both alleles at the S locus and both at the Z locus in diploid pollen matching the female genotype results in incompatibility. In Model II: only one allele at S and one at Z locus in diploid pollen matching the female results in incompatibility. The goals were to determine which of the models best explains SI in our autotetraploid ryegrass population and to evaluate the efficiency of high-resolution melting (HRM) genotyping for discriminating different iso-allelic genotypes. The progeny of a cross between two autotetraploids was characterized with three HRM-based markers co-segregating with Z. Segregation ratios were used to make inferences about the mode of action of the SI system. The observed segregation differed significantly (P < 0.001) from the expected under Model I, but not from the expected under Model II (P = 0.463). Thus, Model II explains SI in this population, and HRM is an efficient tool to distinguish different isoallelic genotypic classes.

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“…A prerequisite for its success is the use of high-yielding but lesscompetitive inbred lines that are similar in their morphological, as well as in their developmental and reproductive, traits. The proportion of hybrids in the seed can be increased by using selfincompatible hnes (England 1974, Posselt 1993, Eickmeyer and Wricke 1994 or partially male-sterile lines in combination with a modified ratio of parental components in the parental population (Kobabe 1992, Berthng et al 1994, as well as by an increase in the number of parental components (n), since, in panmictic populations, i.e. synthetic varieties, the portion of intragenotypic progenies is defined by the factor l/n (Becker 1989).…”

Section: Discussionmentioning

confidence: 99%

Studies of the intraspecific competition and performance of chance‐hybrids in Lotium multiflorum Lam.¹

Stelling

1995

Plant Breeding

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In order to study the effects of competition on the genotypic composition of chance-hybrids in Lolium multiflorum. eight chance-hybrids were produced according to Burton (1948). Inbred hnes and cultivars were used as parents. The proportions of parental and hybrid components in the seeds and growing-field stands of the chance-hybrids were determined over three cuts using gel electrophoresis. The realized hybrid proportions in the seeds, at a maximum of 38.3%, were considerably lower than the theoretically expected 50%. In the field stands, the hybrid proportions of the chance-hybrids derived from inbred lines increased considerably and continously over cuts, whereas those of the chance-hybrids produced from cultivars increased only slightly. A maximum hybrid tiller proportion of 76.8% was found at the third cut. Correspondingly, the total yield of the chance-hybrids produced from cultivars was only slightly higher than that of the parents. The production of chance-hybrids, therefore, proved to be sensible only if inbred lines had been used as parents.

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Hybrid production in Lolium perenne based on incompatibility

Cited by 18 publications

References 6 publications

Progress in breeding perennial forage grasses for temperate agriculture

Progress in breeding perennial forage grasses for temperate agriculture

Validation of two models for self‐incompatibility in autotetraploid perennial ryegrass using high resolution melting‐based markers

Studies of the intraspecific competition and performance of chance‐hybrids in Lotium multiflorum Lam.¹

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Hybrid production in Lolium perenne based on incompatibility

Cited by 18 publications

References 6 publications

Progress in breeding perennial forage grasses for temperate agriculture

Progress in breeding perennial forage grasses for temperate agriculture

Validation of two models for self‐incompatibility in autotetraploid perennial ryegrass using high resolution melting‐based markers

Studies of the intraspecific competition and performance of chance‐hybrids in Lotium multiflorum Lam.1

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Studies of the intraspecific competition and performance of chance‐hybrids in Lotium multiflorum Lam.¹