A database for a more efficient perennial ryegrass breeding programme

Ravel, Catherine; Charmet, G.; Balfourier, François

doi:10.1007/bf00026805

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Data of individual genotypes were stored in an ORACLE-developed database (Ravel et at., 1992) and standard statistics for characterizing genetic variability were computed for all accessions using the ifiOSYS 1 program (Swofford & Selander, 1981). The betweenpopulation component F, (Wright, 1965) was decomposed through a hierarchical F analysis (Wright, 1978) by introducing a between cluster index and a within cluster index, the factor x of classification being the region of origin of the populations.…”

Section: Discussionmentioning

confidence: 99%

Geographical patterns of isozyme variation in Mediterranean populations of perennial ryegrass

Balfourier¹,

Charmet²

1994

Heredity

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), have been studied for allelic variation at 13 enzyme loci. The total genetic diversity results mainly from the within-population component whereas a part of the between-population component can be explained by the geographical origins of the populations. Relationships between accessions have been studied using cluster and multivariate analyses such as principal component and discriminant analyses. Finally, the frequency and distribution of the most discriminating allele have been represented on geographic maps. The results indicate that Corsican populations are similar to Italian accessions whereas both French and Sardinian populations differ from all the others. The origins and relationships between each geographical group of accessions are discussed and, taking historical factors into account, we can suggest that Corsican populations have been introduced from Italy to the eastern side of the island.

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Section: Discussionmentioning

confidence: 99%

Geographical patterns of isozyme variation in Mediterranean populations of perennial ryegrass

Balfourier¹,

Charmet²

1994

Heredity

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Isozyme polymorphism and geographic differentiation in a collection of French perennial ryegrass populations

Charmet¹,

Balfourier²,

Ravel³

1993

Genet Resour Crop Evol

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A sample of 60 natural populations of perennial ryegrass from France has been studied for allelic variation at 7 polymorphic enzyme loci . Population genetic statistics are of the same magnitude than those previously reported for other outbreeding, short-lived perennial species (P = 64%, A = 2 .75, H = 0 .270) .Genotype frequencies at most collection sites do not deviate significantly from Hardy-Weinberg expectations, with however a slight deficit of heterozygotes which may be accounted for by a Wahlund effect. Gene diversity is mainly explained by the within population component . The between population differentiation F s, averaged on 4 loci is only 0 .054, which accounts for only 6% of the whole diversity .When mapped, most allele frequencies do not show any special structure . Only five alleles present a clinal trend from North to South . These 5 alleles are probably related to some climatic factors such as average temperature or potential evapotranspiration . The causal hypotheses about the low level of betweenpopulation differentiation and spatial structure are discussed with reference to the literature .The consequences of the found population structure for sampling and conservation strategies of natural populations for genetic resources are presented and discussed .

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A database for a more efficient perennial ryegrass breeding programme

Cited by 2 publications

References 9 publications

Geographical patterns of isozyme variation in Mediterranean populations of perennial ryegrass

Geographical patterns of isozyme variation in Mediterranean populations of perennial ryegrass

Isozyme polymorphism and geographic differentiation in a collection of French perennial ryegrass populations

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