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Rapport

by Monaco, L.C; Carvalho, A; Association Scientifique Internationale du Café, París (Francia); 7. Colloque International sur la Chimie des Cafés Verts, Torrefies et Leurs Derives Hambourg (Alemania, R.F.) 1975.
Publisher: París (Francia) Other Title: Coffee genetics and interspecific hybridization.Subject(s): COFFEA ARABICA | COFFEA CANEPHORA | COFFEA STENOPHYLLA | HIBRIDOS | ESPECIES | HIBRIDACION INTERESPECIFICA | CRUZAMIENTO | NUMERO DE CROMOSOMAS | FLAVONOIDES | ACIDO CLOROGENICO | BIOQUIMICA | RETROCRUZAMIENTO | COFFEA ARABICA | COFFEA CANEPHORA | COFFEA STENOPHYLLA | HYBRIDS | SPECIES | INTERSPECIFIC HYBRIDIZATION | CROSSBREEDING | CHROMOSOME NUMBER | FLAVONOIDS | CHLOROGENIC ACID | BIOCHEMISTRY | BACKCROSSING | COFFEA ARABICA | COFFEA CANEPHORA | COFFEA STENOPHYLLA | HYBRIDE | ESPECE | HYBRIDATION INTERSPECIFIQUE | CROISEMENT | NOMBRE CHROMOSOMIQUE | FLAVONOIDE | ACIDE CHLOROGENIQUE | BIOCHIMIE | RETROCROISEMENTSummary: The genetic relationship between a few species of the coffee collections is being investigated. The relationship is analysed on the basis crossing ability, gene expression, F1 fertility and F2 segregation. Pairing has benn accomplished to determine the chromosome homology. Besides, the genetic segregation and chromosome pairing studies of biochemical markers are also being undertaken. Emphasis is put on flavones and flavonoids and chlorogenic acid content. Serological studies have also been used. The data so far gathered allow a better insight into coffee evolution and they add new information concerning the validity of the species so far described. Some of the species have shown characteristics of great colour for the breeding program. For instance, hybrids between C. arabica and C. canephora are being used to transfer rust and root-knot nematode resistance to the cultivars of the former species. Also C. stenophylla is being crossed with C. arabica in order to transfer leaf miner tance. In advanced generations of these hybrids, based on the studies already carried out, may occur loss of the desirable genes unless a good selection technique is available. Chromosome unbalance remains after several cycles of backcrossing.
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++ 32 ref. Sum. (En)

p. 497-504

The genetic relationship between a few species of the coffee collections is being investigated. The relationship is analysed on the basis crossing ability, gene expression, F1 fertility and F2 segregation. Pairing has benn accomplished to determine the chromosome homology. Besides, the genetic segregation and chromosome pairing studies of biochemical markers are also being undertaken. Emphasis is put on flavones and flavonoids and chlorogenic acid content. Serological studies have also been used. The data so far gathered allow a better insight into coffee evolution and they add new information concerning the validity of the species so far described. Some of the species have shown characteristics of great colour for the breeding program. For instance, hybrids between C. arabica and C. canephora are being used to transfer rust and root-knot nematode resistance to the cultivars of the former species. Also C. stenophylla is being crossed with C. arabica in order to transfer leaf miner tance. In advanced generations of these hybrids, based on the studies already carried out, may occur loss of the desirable genes unless a good selection technique is available. Chromosome unbalance remains after several cycles of backcrossing.

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