Behavior of 'IPR 100' and 'Apoatã IAC 2258' coffee cultivars under different infestation levels of Meloidogyne paranaensis inoculum.

This study aimed to evaluate the behavior of the cultivars 'IPR 100' and 'Apoata IAC 2258' under different infestation levels of 'Meloidogyne paranaensis' inoculum. The experiment was conducted in a randomized block design and 3 6 factorial arrangement (three cultivars and six inoculum levels). The following inoculum levels were used: 0; 500; 1,500; 3,000; 5,000; and 8,000 eggs plant-1. The root fresh weight and number of eggs were evaluated at 110 days after inoculation. The number of eggs and second-stage juveniles per gram of root (nematodes g-1), reproduction factor (RF), reduction in reproduction factor (RRF), and host susceptibility index (HSI) were determined. The RF, RRF, and HSI were used to classify the resistance levels of the cultivars. The results showed significantly lower levels of nematodes g-1 in IPR 100 and 'Apoata' compared with that of the 'Catuai' as check cultivar. The 'IPR 100' and 'Apoata IAC 2258' cultivars exhibited resistance to 'M. paranaensis' regardless of the inoculum level used. Based on the nematodes g-1, RF, RRF, and HSI, the 'IPR 100' cultivar was more resistant to 'M. paranaensis' than 'Apoata IAC 2258.' Under the experimental conditions adopted here, the initial populations of 1,500 and 3,000 eggs plant-1 are the most suitable for testing resistance to 'M. paranaensis'. However, 3,000 eggs plant-1 was the most efficient population because it can be used to classify the cultivars into different levels of resistance.

[1]  L. Zambolim,et al.  Meloidogyne paranaensis attacking coffee trees in Espirito Santo State, Brazil , 2011, Australasian Plant Disease Notes.

[2]  G. H. Sera,et al.  Reaction of coffee cultivars Tupi IAC 1669-33 and IPR 100 to nematode Meloidogyne paranaensis , 2009 .

[3]  J. Mata,et al.  Progênies de Coffea arabica cv. IPR 100 com resistência ao nematóide Meloidogyne incognita raça 1 , 2009 .

[4]  F. Anthony,et al.  Resistance to Meloidogyne paranaensis in wild Coffea arabica , 2009 .

[5]  J. Mata,et al.  Porta-enxertos de café robusta resistentes aos nematóides Meloidogyne paranaensis e M. incognita raças 1 e 2 , 2006 .

[6]  M. Nicole,et al.  Hypersensitive-like reaction conferred by the Mex-1 resistance gene against Meloidogyne exigua in coffee , 2005 .

[7]  V. P. Campos,et al.  Reprodução de Meloidogyne exigua em cultivares de cafeeiros resistentes e suscetíveis , 2005 .

[8]  I. Abrantes,et al.  Meloidogyne paranaensis n. sp. (Nemata: Meloidogynidae), a Root-Knot Nematode Parasitizing Coffee in Brazil. , 1996, Journal of nematology.

[9]  M. Moens,et al.  Population dynamics and damage levels. , 2009 .

[10]  V. P. Campos,et al.  Levantamento de Fitonematóides em Cafezais do Sul de Minas Gerais , 2008 .

[11]  J. Mata,et al.  Progênies de Coffea Arabica cv IPR-100 resistentes ao nematóide Meloidogyne paranaensis , 2007 .

[12]  R. Carneiro,et al.  Identificação e caracterizaçào de espécies de Meloidogyne em cafeeiro nos Estados de São Paulo e Minas Gerais através dos fenótipos de esterase e SCAR-multiplex-PCR , 2005 .

[13]  C. Astorga,et al.  La resistencia genética de Coffea spp. a Meloidogyne paranaensis: identificación y utilización para la caficultura latinoamericana , 2003 .

[14]  W. Gonçalves.  EFEITO DE DIFERENTES NIVEIS DE INOCULO NA AVALIACAO PRECOCE DA REACAO DO CAFEEIRO A MELOIDOGYNE EXIGUA , 1998 .

[15]  V. P. Campos,et al.  Nematode parasites of coffee, cocoa and tea. , 1990 .

[16]  M. Oostenbrink.  Major characteristics of the relations between nematodes and plants. , 1966 .