Assessment of perennial ryegrass (Lolium perenne L.) for breeding. II. Components of winter hardiness
Euphytica 41(1-2): 99-106
ISSN/ISBN: 0014-2336 DOI: 10.1007/bf00022418
Fourteen characters relating to winter hardiness were measured in 86 accessions from a wide range of climates. Genetic components of variance and covariance were extracted from the data and principal components analysis was carried out. The first 3 independent components accounted for 80% of the variance represented by the genetic correlations and were broadly identified as winter growth, winter hardiness and early spring activity factors. None of the accessions exhibited a combination of extreme winter growth and winter hardiness although several with excellent winter hardiness showed better than average winter growth.