Abstract
ABSTRACT Fusarium wilt (syn= Panama disease), caused by Fusarium oxysporum f. sp. cubense (FOC), is one of the most destructive diseases of banana, being genetic resistance the main management strategy for this disease. Since the pathogen is constantly evolving to supplant the genetic resistance, new sources of resistance must be investigated by genetic improvement programs aiming to developing new varieties. The objective of the present study was to identify sources of resistance from the different accessions maintained in the banana active germplasm bank (BAGB) at Embrapa Mandioca e Fruticultura. Forty-one BAGB accessions were evaluated, including 17 diploids, 21 triploids, and two tetraploids. The area under the disease progress curve, disease index, and incubation period were also evaluated. In relation to FOC resistance, there is genetic variability available among the BAGB accessions. The genotype M53 is notable for the complete resistance it expressed, and the accessions Birmanie, PA Songkla, Pirua, Imperial, Poyo, Ambei, Walebo, and Kongo FRF 1286 expressed quantitative resistance.
Highlights
Material and MethodsBanana farming has high potential for generating jobs and income, and Brazil is one of the five largest producers of bananas in the world (FAOSTAT, 2016)
The most commonly grown varieties in Brazil are affected by Fusarium wilt, but this disease can be efficiently controlled using resistant varieties (SILVA et al, 2016; PLOETZ, 2015)
The banana active germplasm bank (BAGB) accessions evaluated in the two experiments, were grouped in two categories regarding the genetic resistance: susceptible (S)and resistant(R)
Summary
Material and MethodsBanana farming has high potential for generating jobs and income, and Brazil is one of the five largest producers of bananas in the world (FAOSTAT, 2016). Race 4 affects various cultivars, including all of subgroup Cavendish (FOURIE et al, 2011; PLOETZ, 2015). The strains of this race are divided into Tropical (TR4) and Subtropical (ST4) (PLOETZ, 2006; BUTLER, 2013). FOC races 1 and 2 are distributed throughout almost all of Brazil, but TR4 is still not present in the country. If it was accidently introduced it could affect all the cultivars resistant to races 1 and 2 (DITA et al, 2013)
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