| Journal: | Summa phytopathologica |
| Database: | PERIÓDICA |
| System number: | 000285625 |
| ISSN: | 0100-5405 |
| Authors: | Nascimento, Jefferson Fernandes do1 Zambolim, Laercio2 Vale, Francisco Xavier Ribeiro do Berger, Paulo Geraldo Cecon, Paulo Roberto3 |
| Institutions: | 1Universidade Federal de Roraima, Departamento de Fitotecnia, 2Universidade Federal de Vicosa, Departamento de Fitopatologia, Vicosa, Minas Gerais. Brasil 3Universidade Federal de Vicosa, Departamento de Informatica, Vicosa, Minas Gerais. Brasil |
| Year: | 2006 |
| Season: | Ene-Mar |
| Volumen: | 32 |
| Number: | 1 |
| Pages: | 9-15 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Nota breve o noticia |
| Approach: | Experimental |
| English abstract | Four cultivars and 21 lines of cotton were evaluated for resistance to ramulose (Colletotrichum gossypii f. sp. cephalosporioides) in a field where the disease is endemic. The seeds of each genotype were planted in 5 x 5 m plots with three replications. The lines CNPA 94-101 and 'CNPA Precoce 2'were used as standard susceptible and resistant references, respectively. The disease incidence (DI) was calculated from the proportion of diseased plants in the plot. The disease index (DIn) was calculated from the disease severity using a 1 to 9 scale, and was evaluated at weekly intervals starting 107 days after emergence. The data collected was used to calculate the area under disease progress curve (AUDPC). In general, the DIn increased linearly with time and varied from 20.0 to 57.1 and AUDPC from 567 to 1627 among the genotypes which could be clustered in to two distinct groups. The susceptible group contained two cultivars and nine lines and the resistant group contained one cultivar and 12 lines. The relationship between disease index and evaluation times was linear for the 25 genotypes tested. The line CNPA 94-101, used as susceptible standard, was the most susceptible with an average DI = 83.4, DIn = 57.1 and AUDPC = 1627.7. The line CNPA 96-08 with DI = 37.8, DIn = 20.0 and AUDPC = 567.7 was the most resistant one. Among the commercial cultivars 'IAC 22' was the most susceptible and 'CNPA Precoce 2', used as resistant standard was the most resistant. The variability in virulence of the pathogen was studied by spray inoculating ni |
| Disciplines: | Agrociencias |
| Keyword: | Fitopatología, Plantas para uso industrial, Algodón, Gossypium, Variedades, Resistencia genética, Susceptibilidad, Colletotrichum gossypii |
| Keyword: | Agricultural sciences, Phytopathology, Plants for industrial use, Cotton, Gossypium, Genetic resistance, Susceptibility, Colletotrichum gossypii |
| Full text: | Texto completo (Ver HTML) |
