ISHS Acta Horticulturae 681: IV International Congress on Artichoke
ESTIMATION OF REPRODUCTIVE VALUES AND SELECTION OF ELITE PLANTS IN GLOBE ARTICHOKE |
| Authors: | E.L. Cointry, F.S. López Anido, V.P. Cravero, I. Gatti, S.M. Garcia, I.T. Firpo |
| Keywords: | Cynara cardunculus var scolymus, heritability, cluster analysis |
| Abstract:
The Globe artichoke has been traditionally multiplied by agamic means. Over the last 15 years an increasing interest has been focused in breeding and using seed propagated materials. Information regarding genetic parameters and gene action would be extremely useful to define strategies either in selecting schemes or in the development of inbred parents for hybrid production. Twenty full sib families resulting from a NCI mating scheme were planted in the spring of 1996 in a randomized complete block design. During 1997 and 1998 evaluations were performed on total yield, yield per sucker, number of artichokes, market yield, number of productive suckers, weight, height, diameter and height to diameter ratio of the first artichoke, and weight, height and bottom diameter of the first artichoke. An ANOVA was conducted and strict sense heritability was estimated for each year and character. Cluster analysis was also carried out in order to identify elite plants. For the majority of the traits, in the first year the additive portion of the phenotypic variance resulted to be of importance. In the second year, especially for yield traits, it became insignificant. This is explained by the fact that many plants in the first season were vigorous with the typical architecture of seed born plants with many productive suckers. The following year plants were originated from buds of the previous season yielding less vigorous and more homogeneous plants that reduced the expression of genetic differences among families. All this implies that yield characters should be best evaluated in the first year after plantation when maximum differences are expressed. First artichoke and bottom traits could be evaluated in either year. From the cluster analysis eight groups were distinguished. One cluster expressed a maximum total and market yield including eight elite plants, which represent a selected proportion of 4.9%. From these plants two clones were derived and S1 promissory families were advanced. | |
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