Heterosis in crosses of indigenous coffee (Coffea Arabica L) selected for yield and resistance to coffee berry disease:I.AT FIRST BEARING STAGE
1982
Mesfin Ameha(Plant Breeder and Agronomist)
Two high-yielding coffe (Coffea arabica L) lines and three lines selected for resistance to coffee berry disease caused by the fungus (Colletotrichum coffeanum, Noack) were crossed in a half-diallel to produce ten hybrids. The hybrids were grown at Meiko, Jima Research Station (Kaffa), Ethiopia. The F1s exhibited positive mean midparent and high-parent hetero-sis from 7.5 to 21.9 % and from 2.3 to 5%, respectively for girth, number of flowers and fruits and length of first primary branch. The hybrids 741 x F59 and 7395 x F59 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. They were highly significantly superior to their respective high-parent for many of the above characters followed by 7395 x 2970 and 741 x 2970 hybrids. Mid- parent heterosis -33 to 5% and -9 to 3.0% were noted for number of secondary branches and resistance to coffee berry disease, respectively. The correlation analysis of characters in F.s detected significant correlations (r = 0.79 and 0.82) between growth and girth and growth and number of primary nodes. The significant F. heterosis and specific combining ability of 741 x 2970, 741 x F59, 7395 x 2970 and 7395 x F59 indicated the possible desirability of F. hybrids to maximize yield in these materials.
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