Agronomic evaluation of perennial ryegrass wild populations from Ireland for use in French plant breeding programmes

Abstract

(Figs. 2 et 3). Les 4 premières composantes expliquent 85% de l'inertie totale du nuage, avec un premier axe très corrélé positivement à toutes les notes de vigueur et à la résistance au froid. L'axe 2 oppose l'aiternativité à la tardiveté d'épiaison tandis que l'axe 3 oppose la sensibilité à la rouille et à la remontaison.Une classification hiérarchique ascendante à partir des 6 premières composantes principales permet d'obtenir une partition en 4 classes (Fig. 1) (Fig. 4)

Agronomic, leaf anatomy, morphology, endophyte presence and ploidy characterization of accessions of Festuca group rubra collected in northern Spain

“…The advantage of single-plant characterization is that initial screening can be done with only a few seeds. Characterization of forage grasses through multivariate analysis methods has been used carried out by many authors (Hayward et al, 1982;Charmet et al, 1989;Oliveira and González, 2000). A similar method was used in the present study.…”

“…The scores for each accession were considered in the PCA as an alternative to the Smith-Hazel selection index, as recommended by Charmet et al (1989). In this study, the first PC was positively correlated with seasonal growth and negatively with colour.…”

Agromorphological characterization, cyanogenesis and productivity of accessions of white clover (Trifolium repens L.) collected in Northern Spain

“…The replicate and year effects were considered to be random. The accession effects were tested against the accession × year interaction, and when found to be significant, were used in further analyses (except for tolerance to foliar diseases and dry matter yields, in which the accession × year interaction was important and the data from each year were used) (Charmet et al 1989). Separation of means was performed by the least-significant difference (LSD) test.…”

Influence of ecological factors on population differentiation in perennial ryegrass (Lolium perenne L.)

“…The results of agronomic evaluation in France of a sample of this collection have been reported (Charmet et al ., 1989) and only a weak relationship between plant vigour and average July temperature was found . This study investigates the possible directional influence of microenvironmental conditions on population differentiation .…”