Abstract The aim of this study was to identify resistance to bacterial halo blight in Arabica coffee lines carrying Coffea racemosa genes. Eighteen Arabica coffee lines derivative from the genotype C1195-5-6-2, and the cultivars IAPAR 59 and IPR 99 were evaluated for resistance to bacterial halo blight in two trials carried out in field conditions, in Londrina, PR, Brazil. The cultivars Mundo Novo IAC 376-4 and Catuaí Vermelho IAC 81 were included as susceptible controls. Ten lines and the cultivar IAPAR 59 showed resistance to bacterial halo blight. The cultivar IPR 99 presented intermediate reaction, and the controls were very susceptible. This is the first study to show that lines derivative from the genotype C1195-5-6-2, which has C. racemosa genes, could be a source of resistance to bacterial halo blight in coffee breeding programs.

RESUMO O objetivo do trabalho foi avaliar a reação ao nematoide Meloidogyne paranaensis em progênies de café arábica derivadas do Icatu. O experimento foi conduzido em telado, no Instituto Agronômico do Paraná (IAPAR), em Londrina, Paraná, Brasil. Mudas com três a quatro pares de folhas foram inoculadas com 5.000 ovos e juvenis de segundo estádio (J2) de Meloidogyne paranaensis. Foram avaliadas quatro progênies F4 de HN 87609 derivadas de ‘Icatu H4782-7-925’. Como padrões de suscetibilidade e resistência, foram utilizados, respectivamente, Coffea arabica cv. Catuaí Vermelho IAC 81 e C. arabica cv. IPR 100. O experimento foi instalado em blocos casualizados com 14 repetições e uma planta por parcela. As avaliações foram efetuadas 120 dias após a inoculação. Foram avaliados o número de ovos e J2 por gramas de raiz (Nematoides∙g–1) e o fator de reprodução (FR). Para classificar os níveis de resistência das progênies, foi utilizado o índice de suscetibilidade do hospedeiro (ISH). De acordo com Nematoides∙g–1, as progênies IAPAR 12232 e IAPAR 12231 não diferiram estatisticamente do padrão resistente ‘IPR 100’. Todas as progênies F4 de HN 87609 foram altamente resistentes pelo ISH e apresentaram 100% das plantas classificadas como altamente resistentes ou resistentes. Portanto, a resistência a M. paranaensis está condição homozigótica.

ABSTRACT The aim of this study was to evaluate the reaction of Arabica coffee progenies derived from Icatu to Meloidogyne paranaensis. The experiment was conducted under screenhouse conditions at Instituto Agronômico do Paraná (IAPAR) in Londrina, Paraná State, Brazil. Seedlings with three to four pairs of leaves were inoculated with 5,000 M. paranaensis eggs and second-stage juveniles (J2). Four F4 progenies of HN 87609 derived from Icatu H4782-7-925 were evaluated. C. arabica cv. Catuaí Vermelho IAC 81 and C. arabica cv. IPR 100 were susceptible and resistant checks, respectively. The experiment was conducted in a randomized blocks design with 14 replications of one plant per plot. Assessments were performed 120 days after inoculation. The number of eggs and second-stage juveniles (J2) per gram of roots (Nematodes∙g–1) and reproduction factor (RF) were evaluated. Host susceptibility index (HSI) was used to classify the resistance levels of coffees. In relation to Nematodes∙g–1, IAPAR 12232 and IAPAR 12231 progenies were not significantly different from the resistant check IPR 100. All F4 progenies of HN 87609 were classified as highly resistant by HSI and presented 100% of plants classified as highly resistant or resistant. Therefore, these progenies are homozygously resistant to Meloidogyne paranaensis.

O objetivo desse estudo foi selecionar progênies de café produtivas e com resistência à ferrugem em dois locais do Estado do Paraná (Brasil). Os experimentos de campo foram instalados no delineamento experimental em blocos ao acaso nos município de Itaguajé e Congonhinhas. Foram avaliadas as características produção, vigor vegetativo e resistência à ferrugem em nove progênies de café arábica e em três cultivares padrões. Vários genótipos derivados do "Sarchimor" e do "Catucaí" apresentaram plantas suscetíveis. Três cafeeiros do germoplasma Sarchimor e uma progênie "F6 de Catuaí x (Catuaí x cafeeiro da série BA-10)" foram selecionados para avanço de geração e têm potencial para se tornarem novas cultivares, pois apresentaram produção maior que 'IAPAR 59' e 'Tupi IAC 1669-33' e muitas plantas apresentaram resistência completa à ferrugem.

The aim of this study was to select high-yielding coffee progenies with resistance to coffee leaf rust for the State of Paraná (Brazil). Field experiments in a randomized block design were carried out in Itaguajé and Congonhinhas. Yield, vegetative vigor and rust resistance of nine progenies of Arabic coffee and three check cultivars were evaluated. Many genotypes derived from "Sarchimor" and "Catucaí" were susceptible. Three coffee genotypes of Sarchimor germplasm and the F6 generation of genotype "Catuaí x (Catuaí x BA-10 coffee)" were selected to advance generations and are promising to become new cultivars for being higher-yielding than 'IAPAR 59' and 'Tupi IAC 1669-33' and having a large number of plants with complete rust resistance.

The objective of the study was to evaluate the resistance to rust in coffee cultivars developed by research institutes of Brazil in Paraná state. Resistance to the local leaf rust races was assessed in high disease intensity field conditions at Londrina and Congonhinhas in 2009 and 2010.The cultivars were developed by the EPAMIG/UFV, IAPAR, IAC and MAPA/Procafé. The resistant standard 'IAPAR 59' and the susceptible standards Catuaí Vermelho IAC 144' and 'Bourbon Amarelo' were used. A randomized block design with three replications and plots with 10 plants was used. A scale from 1 to 5 based on the rust intensity was used to evaluate the resistance. The Catiguá MG 1, Catiguá MG 2, IAPAR 59, IPR 98, IPR 104, Palma II, Paraíso H-419-10-6-2-5-1, Paraíso H-419-10-6-2-10-1, Paraíso H-419-10-6-2-12-1, Pau Brasil MG 1 and Sacramento MG 1 cultivars presented complete resistance to rust at Londrina and Congonhinhas. The cultivars derived from the Catucaí germplasm were susceptible or showed different levels of partial resistance. Partial resistance to the rust was observed in several coffees derived from "Hibrido de Timor". 'Acauã' and 'Obatã IAC 1669-20' presented complete resistance at Londrina, but at Congonhinhas, they were partially resistant, indicating that different rust races have occurred at these two locations.