Table 1. Summary of events during more than 30 years of research to fix compact genes
Population Dtails Year Oleifera
genes
 (%)		 Palms Trials
OxG Oustanding OxG hybrid naturally pollinated identified 1966 50 1  
OCP Original compact palm derived from natural OxG hybrid crossed with guineensis 1970 25 1  
BC1 First backcross population of OCP crossed to guineensis origins: La Mé, Ekona, Ulu Remis, AVROS, Yangambi and Deli dura. 1978
1982		 12.5 567 1
9 Two BC1 palms selected 1983 12.5 2  
BC1F1 Two selected BC1 palms itercrossed and selfed 1985 12.5 120 2
9 Five BC1F1 Dura and seven Teneras selected 1990 12.5 12  
BC1F2 Selected Dura and Tenera BC1F1 palms intercrossed and crossed to full-sib compact pisiferas 1994 12.5 530 2
BC1F1 x Eg Selected BC1F1 palms crossed to Calabar, La Mé and AVROS parents 1994 6.25 414 3
BC2 Second backcross population originated from the two BC1 selected palms crossed to Deli x AVROS, Bamenda, Ekona and AVROS parents 1985 6.25 2,330 4
9 Fifteen BC2 Tenera and ten Dura palms selected   6.25 15  
BC2F1 Selected BC2 Duras y Tenera selfed and crossed to full-sib BC2 pisiferas 1995 6.25 2,329 4
BC3 Third backcross population of BC2 selected Dura and Tenera palms crossed to AVROS, Ekona, Nigeria, Calabar, La Mé and Yangambi Tenera palms 1995 3.125 1,088 2

 Note: O = oleifera; G = guineensis; Eg = Elaeis guineensis; BC = backcross; F = filial generation

i)     Observation plots, to BC1: 14-40 palms, to RC1F2: 20-25 palms; to RC2F1: two trials, 20-40 palms; to BC3, one trial, 20-48 palms.

ii)    Honey Comb Design, Fasoulas (1976) and Sterling, et al (1991), to BC1F1 x Eg, 12-30 palmsfor each cross.

iii)   Randomized blocks design to BC1F1, two reps and 15 palms per rep; to BC2, with 4 reps, 20 palms per rep; to BC2F1, one trial with 3 reps and 12 palms per rep, one second trial with 4 reps and 12 palms per rep; and to BC3, one trial with 3 reps and 12 palms per rep.

iv)   In Honduras 1995 one trial semicommercial of 25 ha, in randomized blocks design, with a density of 160 palms/ha, with 7 reps and 12 palms per plot (84 palms per cross).