café icatu como fonte de resistência a colletotrichum coffeanum icatu coffee cultivar as source of resistance to the agent of coffe berry disease

café icatu como fonte de resistência a colletotrichum coffeanum icatu coffee cultivar as source of resistance to the agent of coffe berry disease

;A. Carvalho;L. C. Mônaco;H. A. M. Van der Vossen
revista espanola de salud publica 1976 Vol. 35 pp. 343-347
113
carvalho1976bragantiacaf

Abstract

Linhagens e progênies do cultivar icatu, selecionadas em Campinas, foram testadas na Coffee Research Station, Ruiru, Quênia, a fim de avaliar o grau de resistência ao ataque de Colletotrichum coffeanum, agente responsável pela moléstia mais conhecida por CBD. Os dados de infecção obtidos para 11 linhagens e sete progênies foram comparados com os dos cultivares testemunhas Rume Sudan, resistente, e SL 28, suscetível. Considerando apenas a freqüência de resistentes, com grau 1 de infecção, destacaram-se a progênie H 4782-10 M e a linhagem LCH 3851-4 T. As populações com graus de 1 a 4 de resistência ocorreram em menor escala do que no Rume Sudan, porém salientou-se a progênie H 4782-10 M, com elevada resistência. As maiores porcentagens de plantas suscetíveis foram verificadas nas linhagens LCH 3849-7 M e LCH 4782-13 T, as quais se aproximam da linhagem suscetível SL 28. Os dados preliminares indicam que o germoplasma icatu, como o híbrido de timor, oferece perspectivas de constituir razoável fonte de resistência genética ao agente da CBD.
Several samples of the coffee cultivar Icatu were evaluated for resistance to the agent of the CBD (Colletotrichum coffeanum). All tests were performed at the Ruiru Coffee Experiment Station, Kenya. Resistant cultivars Rume Sudan and the susceptible SL 28 were used for comparison. Tests were performed using young seedlings innoculation. It was found that seedlings with grade 1 of the resistance scale occurred in several Icatu progenies. Seedlings of the grades 1 to 4, were noticed more frequently in the progenies H 4782-10 M and LCH 3851-4 M. Susceptible plants, in the class with 10-12 grades, occurred in higher proportion in the progenies LCH 3849-7 M and LCH 4782-10 T. All resistant seedlings were transplanted to the field for further tests of resistance. These preliminary data indicated that the Icatu coffee can be considered as a good source of genetic resistance to the agent of the CBD disease.

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