ISHS Acta Horticulturae 140: Fruit Breeding, XXI IHC
HETEROSIS IN CROSSES OF INDIGENOUS COFFEE SELECTED FOR YIELD AND RESISTANCE TO COFFEE BERRY DISEASE-FIRST BEARING STAGE |
| Author: | M. Ameha |
| Abstract:
Two high-yielding coffee Coffea arabica L. lines and three lines selected for resistance to coffee berry disease caused by a fungus Colletotrichum coffeanum Noack were crossed in a half-diallel to produce ten hybrids. The hybrids were grown at Melko, Jimma Research Station. The F1s exhibited positive mean midparent and high-parent heterosis from 7.5 to 21.9% and from 2.3 to 5 %, respectively for girth, number flowers and fruits and length of first primary branch and the hybrids 1 x 5 and 3 x 5 exhibited high-parent heterosis from 10 to 12 % for girth; 16 to 23 % for number of flowers and fruits; 9 to 10% for length of first primary branch; 11 to 12 % for number of primary nodes and 8 to 10 % for number of bearing primary nodes and were highly significantly superior to their respective high-parent for many of the above characters followed by 3 x 4 and 1 x 4 hybrids. Midparent heterosis -33 to 5 % was noted for number of secondary branches. The correlation analysis of characters in F1s detected significant correlations (r=0.79 and 0.82) between growth and girth and growth and number of primary nodes. The significant F1 heterosis and SCA of 1 x 4,1 x 5, 3 x 4 and 3 x 5 indicated the possible desirability of F1 hybrids to maximize yield in these material. | |
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