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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.1981.tde-20220208-001606
Document
Author
Full name
Maria Angélica Pizzinato Geraldi
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1981
Supervisor
Title in Portuguese
Caracterização patogênica e serológica de Colletotrichum graminicola (Ces.) Wils. {sensu Arx, 1957} do trigo e resistência varietal em Triticum aestivum L.
Keywords in Portuguese
ANTRACNOSE
FUNGOS FITOPATOGÊNICOS
PATOGENICIDADE
RESISTÊNCIA GENÉTICA VEGETAL
SEROLOGIA
TRIGO
Abstract in Portuguese
A taxonomia e nomenclatura de Colletotrichum graminicola (Ces) Wils. {sensu Arx, 1957}, agente causal da Antracnose do trigo, foram discutidas baseando-se nos resultados obtidos em testes serológicos e de inoculação cruzada. Nos testes de dupla difusão em gel ágar em lâminas evidenciou -se que o isolado de C. graminicola de trigo é serologicamente distinto dos isolados de cana-de-açúcar e sorgo, ou seja, respectivamente das formae speciales sacchari e sorghi de C. graminicola. As inoculações cruzadas realizadas em casa de vegetação, através da imersão de plântulas em suspensões de esporos de isolados de C. graminicola de diferentes gramíneas hospedeiras mostraram que o trigo só é infectado pelo isolado congenial, que por sua vez é patogênico também às cultivares de centeio e cevada testadas. Em vista desses resultados e de observações de outros autores sugere-se a designação de forma specialis secalis, para os isolados de C. graminicola de trigo, centeio e cevada. Estudou-se ainda o efeito da utilização de diferentes concentrações de inóculo de C. graminicola na reação de quatro cultivares de trigo, não sendo observada qualquer diferença na manifestação dos sintomas da doença nas plantas inoculadas. Finalmente inocularam-se dezessete cultivares de trigo com um isolado congenial de C. graminicola, das quais apenas a cultivar CNT 8 mostrou-se resistente.
Title in English
Pathogenical and serological characterization of Colletotrichum graminicola (Ces.) Wils. {sensu Arx, 1957} from wheat and varietal resistance in Triticum aestivum L.
Abstract in English
Taxonomy and nomenclature of the causal agent of wheat Anthracnose, Colletotrichum graminicola (Ces.) Wils. {sensu Arx, 1957} were discussed, based on the results obtained from serological and cross inoculation tests. The double diffusion tests in agar gel showed clearly that the wheat isolate of C. graminicola is serologically distinct from those from sugar cane (f. sp. sacchari) and sorghum (f. sp. sorghi). Cross inoculations were made under greenhouse conditions by the immersion of seedlings in conidial suspensions of C. graminicola isolated from different gramineous hosts. The results showed that wheat is infected only by the congenial isolate. The wheat isolate was also pathogenic to the tested rye and barley cultivars. Taking into account these results and the observations of other authors, it is suggested the designation of forma specialis secalis to the isolates of C. graminicola from wheat, rye and barley. The effect of utilization of different inoculum concentrations of C. graminicola in the reaction of four wheat cultivars was also studied. There were no differences in the symptomatology expressed by the inoculated seedlings. Among seventeen wheat cultivars that were inoculated with a congenial isolate of C. graminicola only the CNT 8 was resistant.
 
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Publishing Date
2022-02-08
 
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