Resistance of new Coffea canephora clones to root-knot nematode (Meloidogyne incognita) in the western amazon.

Root-knot disease is among the main diseases affecting coffee crop. The plant selection to the development new resistant cultivars is among one the most efficient methods of control. The present work aimed to quantify the resistance responses of Coffea canephora clones to root-knot nematode Meloidogyne incognita in the Western Amazon. For this, 17 previously selected clones were evaluated in three experimental trials, carried out in the municipalities of Ji-Paraná and Porto Velho, Rondônia. The resistance to root-knot nematodes M. incognita were evaluated by the numbers of gall in the roots (NG) and by the reproductive factor (RF). The resistance response was also interpreted according the genetic diversity of the clones based in their morphological traits. The clones BRS3210, C12, BRS2314, BRS3137 and BRS1216 are resistant to M. incognita with RF of 0.34, 0.62, 0.79, 0.86 and 0.98, respectively. BRS3213, C125, C15, BRS2336, BRS3220 and C09 clones were classified as susceptible, with RF of 1.93, 1.95, 2.00, 2.31, 2.32 and 2.35. The BRS3193, C160 and BRS2357 clones were classified as very susceptible, with RF values of 3.03, 4.41 and 5.82, respectively. The clustering based on the genetic diversity of morphological traits indicated that genotypes more similar to the Robusta botanic variety had lower RF. The hybrid plants showed intermediate degrees of resistance indicating the segregation for the character of the M. incognita resistance. The clones BRS3210, C12, BRS2299, BRS2314, BRS3137 and BRS1216 expressed resistance responses to M. incognita with potential for growing resistant genotypes in the Western Amazon.

Bibliographic Details

Main Authors:	RUDNICK, V. A. de S., VIEIRA JÚNIOR, J. R., FERNANDES, C. de F., ROCHA, R. B., TEIXEIRA, A. L., RAMALHO, A. R., ESPINDULA, M. C., SANTOS, A. V., ANJOS, E. F. M. dos, UCHÔA, F. P.
Other Authors:	Vaneide Araújo de Sousa Rudnick, Universidade Federal de Rondônia (UNIR); JOSE ROBERTO VIEIRA JUNIOR, CNPAT; CLEBERSON DE FREITAS FERNANDES, CNPAT; RODRIGO BARROS ROCHA, CPAF-RO; ALEXSANDRO LARA TEIXEIRA, CPAF-RO; ANDRE ROSTAND RAMALHO, CPAF-RO; MARCELO CURITIBA ESPINDULA, CPAF-RO; Anderson Vieira Santos, Universidade Luterana do Brasil (ULBRA); Elize Francisca Mendes dos Anjos, Universidade Federal de Rondônia (UNIR); Francisco Paiva Uchôa, Universidade Federal de Rondônia (UNIR).
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2020-09-09
Subjects:	Nó da raiz, Ji-Paraná (RO), Porto Velho (RO), Rondônia, Amazônia Ocidental, Western Amazon, Melhoramento Genético Vegetal, Doença de Planta, Café, Coffea Canephora, Nematóide, Meloidogyne Incognita, Comportamento de Variedade, Resistência Genética, Plant breeding, Root diseases, Root-knot nematodes, Variety trials, Disease resistance,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124813 https://doi.org/10.25186/.v15i.1708
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