Crescimento, acumulo de nutrientes e reação de genótipos de Coffea canephora ao parasitismo depor Meloidogyne incognita e M. paranaensis
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Data
2025-07-10
Autores
Gomes, Sâmela Cansi
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Universidade Federal do Espírito Santo
Resumo
The coffee plant, Coffea spp., is affected by several diseases that represent the main limiting factor to its production potential, with emphasis on diseases caused by soil-borne pathogens, especially phytonematodes of the genus Meloidogyne Göldi, 1887. Two experiments were carried out. The first, in a greenhouse from September 2024 to January 2025, evaluated the effect of M. incognita (Mi) parasitism on the morphological, nutritional, and genetic resistance characteristics of C. canephora (Cc) genotypes. The experiment was carried out for 90 days in CRD in a 7 x 2 factorial scheme (6 genotypes of C. canephora: A1, MC7, K61, AS2, R8 and R22 and LB1 clonal var. Jequitibá: susceptibility pattern to Meloidogyne spp.) x 2 nematode inoculum levels (0 and 5,000 individuals/plant) with 7 replicates for each inoculum level. The second experiment, carried out between January and May 2025, was identical to the first, except that the genotypes were inoculated with M. paranaensis (Mp). In both experiments, nematode reproduction, plant growth, nutrient concentration, and anthocyanin and flavonoid levels in leaves were evaluated, as well as total soluble phenol concentration in roots. Genotypes A1 and K61 inoculated with M. incognita had RF values less than 1 and were considered resistant. The other genotypes had RF values greater than 1 and were susceptible. Regarding the genotypes inoculated with M. paranaensis, except for LB1, the others had RF values less than 1 and were resistant. Whether comparing within the same period (0 or 90 days after inoculation, DAI) or between different evaluation periods, the means of the evaluated variables did not follow the same trend. That is, for some genotypes susceptible to M. incognita or M. paranaensis, there was a reduction in the evaluated variables, as expected. On the other hand, some resistant clones also showed a reduction in these variables. It was also noted that in some evaluations, susceptible genotypes showed an increase in the studied variables, and resistant genotypes showed a reduction
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Nematoide das galhas , Café conilon , Café robusta , Danos , Root-knot nematode , Conilon coffee , Robusta coffee , Damage