Abstract

ABSTRACT Snap beans have been widely used in organic farming as a good income source and an alternative to diversify production, with increasing use in crop rotation. This work reports the evaluation of 25 bush-type snap beans accessions for their suitability to integrate a breeding program for organic farming, as well as for their resistance to the common bacterial blight (CBB). Agronomic performance was assessed in two field experiments (September-December, 2013; April-June, 2014), in complete blocks at random, while resistance to CBB was assessed in greenhouse, in a completely randomized trial. Plants were challenged with two isolates, one from Xanthomonas axonopodis pv. phaseoli and another from X. fuscans subsp. fuscans. Accessions UEL 402, UEL 405, UEL 407, UEL 408, UEL 412, UEL 417 and UEL 420 were highly productive in both seasons (averages of 10.3, 8.7, 9.5, 9.2, 8.9, 9.3 and 9.2 t/ha, respectively), and are promising for use both as cultivars by organic farmers in the region of Londrina and also as germplasm in breeding programs for developing cultivars adapted to the region. Although all accessions were moderately susceptible to CBB, accessions UEL 407, UEL 409, UEL 411, UEL 412, UEL 424 and UEL 431 presented the lowest values for the area under CBB progress curve for both isolates.

Highlights

  • O feijão de vagem vem sendo amplamente utilizado na agricultura orgânica por ser uma boa fonte de renda e uma alternativa para diversificar a produção, com uso crescente em rotação de culturas

  • Embora todos os acessos tenham sido moderadamente suscetíveis ao crestamento bacteriano comum (CBC), os acessos Universidade Estadual de Londrina (UEL) 407, UEL 409, UEL 411, UEL 412, UEL 424 e UEL 431 apresentaram valores menores para área abaixo da curva do progresso do crestamento bacteriano para ambos os isolados

  • Cultivars meant for organic farming should be developed according to agroecological principles, using germplasm adapted to local conditions

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Summary

Introduction

O feijão de vagem vem sendo amplamente utilizado na agricultura orgânica por ser uma boa fonte de renda e uma alternativa para diversificar a produção, com uso crescente em rotação de culturas. The common bacterial blight (CBB), caused by Xanthomonas axonopodis pv. Fuscans (Xff) (EFSA Panel on Plant Health, 2014), is considered the main bacterial disease affecting beans in Brazil (Trindade et al, 2012; Silva et al, 2013).

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