Etude de l'interaction génotype-environnement de onze lignées sélectionnées de Coffea arabica L
The sources of the genotype-environment interaction represented by three sites and three-four years have been studied in trials on eleven improved lines of Coffea arabica L., with four replications. The sites are different high-yielding areas that are representative of the coffee-growing conditions on the plains and in the mountains in the country. This study has used the results of regional assessment of lines undergoing selection over the first four harvests (1980-1983), which are frequently used for selecting material in experiments. The following morpho-agronomic characters have been studied: coffee berry yield (kg/pl.); height of the plant (cm); diameter of the trunk (cm); length of the primary branches (cm); number of primary branches; length of the internodes (cm); number of internodes; beginning of the annual picking period (days); duration of the successive pickings (days); number of successive pickings. To estimate stability, the linear regression methods of Finlay and Wilkinson (1963) and Eberhart and Russell (1966) and the ecovalence method (Wricke, 1962, 1964, 1965) have been used. The cleck, Caturra, has been found to be very high-yielding and moderately stable. The most stable lines for yield have been: RS 7-2, RS 33-1 and RS 20-17. It is worth mentioning that the RS 8-12 line has been the most stable of all for six of the morpho-agronomic characters studied. Under the conditions in this study, it is recommended that the Caturra, RS 7-12 and RS 8-12, lines be used simultaneously as checks
| Main Authors: | , , , , , |
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| Format: | biblioteca |
| Published: |
París (Francia)
1988
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| Subjects: | COFFEA ARABICA, SELECCION, LINEAS, INTERACCION GENOTIPO AMBIENTE, CARACTERISTICAS AGRONOMICAS, ETAPAS DE DESARROLLO DE LA PLANTA, |
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| Summary: | The sources of the genotype-environment interaction represented by three sites and three-four years have been studied in trials on eleven improved lines of Coffea arabica L., with four replications. The sites are different high-yielding areas that are representative of the coffee-growing conditions on the plains and in the mountains in the country. This study has used the results of regional assessment of lines undergoing selection over the first four harvests (1980-1983), which are frequently used for selecting material in experiments. The following morpho-agronomic characters have been studied: coffee berry yield (kg/pl.); height of the plant (cm); diameter of the trunk (cm); length of the primary branches (cm); number of primary branches; length of the internodes (cm); number of internodes; beginning of the annual picking period (days); duration of the successive pickings (days); number of successive pickings. To estimate stability, the linear regression methods of Finlay and Wilkinson (1963) and Eberhart and Russell (1966) and the ecovalence method (Wricke, 1962, 1964, 1965) have been used. The cleck, Caturra, has been found to be very high-yielding and moderately stable. The most stable lines for yield have been: RS 7-2, RS 33-1 and RS 20-17. It is worth mentioning that the RS 8-12 line has been the most stable of all for six of the morpho-agronomic characters studied. Under the conditions in this study, it is recommended that the Caturra, RS 7-12 and RS 8-12, lines be used simultaneously as checks |
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