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Analyse de la variabilitè des populations naturelles des cafeiers diploides (Coffea sp.); observations sur le teneur en cafeine et sur le polymorphisme enzimatique

by Berthaud, J; Berthou, F; Association Scientifique Internationale du Café, París (Francia); 8. Colloque Scientifique International sur le Café Abidjan (Cote d'Ivoire) 1977.
Publisher: París (Francia) 1979Description: p. 385-391.Subject(s): COFFEA | DIPLOIDE | ESPECIES | ANALISIS QUIMICO | CAFEINA | ENZIMAS | POLIMORFISMO ENZIMATICO | VARIACION GENETICA | COFFEA | SPECIES | CAFFEINE | ENZYMES | ENZYME POLYMORPHISM | GENETIC VARIATION | COFFEA | ESPECE | CAFEINE | ENZYME | POLYMORPHISME ENZYMATIQUE | VARIATION GENETIQUESummary: The determination of a quantitative character, the caffeine content, in diploid species revealed the genetic richness of the different populations surveyed. Intrapopulation variability is very marked and in general sufficient to explain all the variations recorded. An investigation of enzymatic polymorphism by mean of electrophoresis technique showed that there exists homogeneous populations and very heterogeneous populations for these characters. The study of the esterases of C. congensis surveyed in Central Africa revealed the existence of a large number of phenotypes within each of these populations. The observations on C. liberica var. excelsa confirmed the great intrapopulation variability and the differentiation of some populations along different axes. These first studies demonstrate the great variability of natural coffee tree populations as regard the characters observed and show the interest of this material in improvement programmes for this plant
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The determination of a quantitative character, the caffeine content, in diploid species revealed the genetic richness of the different populations surveyed. Intrapopulation variability is very marked and in general sufficient to explain all the variations recorded. An investigation of enzymatic polymorphism by mean of electrophoresis technique showed that there exists homogeneous populations and very heterogeneous populations for these characters. The study of the esterases of C. congensis surveyed in Central Africa revealed the existence of a large number of phenotypes within each of these populations. The observations on C. liberica var. excelsa confirmed the great intrapopulation variability and the differentiation of some populations along different axes. These first studies demonstrate the great variability of natural coffee tree populations as regard the characters observed and show the interest of this material in improvement programmes for this plant

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