Considerations in breeding for improved yield and quality in arabica coffee (Coffea arabica L.) :
Variation for growth, yield and quality characters was studied in a diallel cross among 11 varieties of arabica coffee. The objective was to demonstrate the possible application of such information in breeding programmes for improved yield and coffee quality. Growth characters especially girth, height, internode length on stem and primaries and canopy radius had a high repeatability. Such characters are heritable, even with a single measurement taken on young coffee trees. For most yield characters, a good assessment can only be obtained if it is based on the mean of several years records. Regarding quality characters, single berry weight, percentage AA, percentage AB and percentage PB showed a high heritability. Genetic variation for selected growth and yield characters was due to genes with additive and dominance effects. There was also evidence of epistatic effects among gene governing most of these characters, and especially so for yield. A detailed study of genotype-environment interactions revealed that it is possible to select for high yielding genotypes with the desired level of linear response to environments. Height and angle of primaries could be selected on basis of 1 year old seedlings in the nursery. It is also possible to base individual tree selection for yield on performance of fairly young coffee trees. Implications of these results in breeding programmes are discussed. A breeding scheme is proposed aimed at developing compact high yielding coffee varieties with good quality which also combine resistance to the two main diseases of arabica coffee, coffee berry disease and coffee rust. The breeding scheme entails either development of hybrid varieties, or a programme of further selection to derive seed varieties. Important features of such a scheme are: 1- the used of information on genetic basis of variation for certain characters in planning hybridization programmes
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| Format: | biblioteca |
| Language: | eng |
| Published: |
Wageningen (Países Bajos)
1983
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| Subjects: | COFFEA ARABICA, VARIEDADES, VARIACION GENETICA, HEREDABILIDAD, VIGOR HIBRIDO, RESISTENCIA A LA ENFERMEDAD, DIALELO, COLLETOTRICHUM COFFEANUM, HEMILEIA VASTATRIX, |
| Online Access: | http://orton.catie.ac.cr/repdoc/ |
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