Auto-incompatibilidade, produtividade, ocorrencia de sementes do tipo moca e mudas anormais no café Icatu
Fruit set after self-pollination, occurrence of peaberry seeds and abnormal seedlings were recorded for six Icatu coffee populations, in an experiment located in Campinas, Brazil. Among the six Icatu populations three had two backcrosses to C. arabica while the other three populations had only one backcross. It was observed that the mean percent of fruit set after artificial self-pollination of a large number of flowers, attempted in several consecutive years, was higher for the more advanced populations. Among those populations, some plants had fruit set similar to the C. arabica cv. Catuaí Vermelho used as control. Other plants were practically self-incompatible, and these plants may be used in the future for production of hybrid seeds. The percentage of peaberry seeds was higher for the populations with only one backcross (39 to 56 percent) as compared to those with two backcrosses (22 to 29 percent). Abnormal seedlings were more frequent in the progenies of plants of the BC1 populations derived from selfed flowers. However several plants gave rise to progenies with very few abnormal seedlings. Fortunately the same have been observed in S2 progenies of some plants selected on the basis of yield performance . The results suggest that the rate of cross-pollination in the studied Icatu populations is higher than in C. arabica. Icatu as Arabusta seems to constitute excellent germplasm giving rise to progenies capable of high yield besides good cup quality, resistance to leaf rust and coffee berry disease
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1983
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| Subjects: | COFFEA ARABICA, CATUAI, ICATU, ANGUSTIFOLIA, MOCA, RETROCRUZAMIENTO, SEMILLAS ANORMALES, AUTOPOLONIZACION, POLINIZACION CRUZADA, PLANTAS ANORMALES, INCOMPATIBILIDAD DEL POLEN, |
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| Summary: | Fruit set after self-pollination, occurrence of peaberry seeds and abnormal seedlings were recorded for six Icatu coffee populations, in an experiment located in Campinas, Brazil. Among the six Icatu populations three had two backcrosses to C. arabica while the other three populations had only one backcross. It was observed that the mean percent of fruit set after artificial self-pollination of a large number of flowers, attempted in several consecutive years, was higher for the more advanced populations. Among those populations, some plants had fruit set similar to the C. arabica cv. Catuaí Vermelho used as control. Other plants were practically self-incompatible, and these plants may be used in the future for production of hybrid seeds. The percentage of peaberry seeds was higher for the populations with only one backcross (39 to 56 percent) as compared to those with two backcrosses (22 to 29 percent). Abnormal seedlings were more frequent in the progenies of plants of the BC1 populations derived from selfed flowers. However several plants gave rise to progenies with very few abnormal seedlings. Fortunately the same have been observed in S2 progenies of some plants selected on the basis of yield performance . The results suggest that the rate of cross-pollination in the studied Icatu populations is higher than in C. arabica. Icatu as Arabusta seems to constitute excellent germplasm giving rise to progenies capable of high yield besides good cup quality, resistance to leaf rust and coffee berry disease |
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