Rivero-González D, Corzo M, Plasencia O, Cruz A, Martínez B, Martínez Y

Language: English
References: 0
Page: 2101-2108
PDF size: 333.11 Kb.

ABSTRACT

Brown sheath rot is a bacterial disease that affects rice crops virtually in all regions of production in the world, but its incidence in Cuba has not been recorded yet. Its main causal agent is the species Pseudomonas fuscovaginae, although in some countries other species producing the symptoms are reported, including Pseudomonas syringae pv. syringae. Although P. fuscovaginae is registered in group A1 of the List of Quarantine Plagues of the Republic of Cuba, it has been reported in the Central America and Caribbean region, and therefore poses a threat to the country. Therefore, the aim of this review is to provide updated information on the characterization and effective diagnosis of P. fuscovaginae. Symptoms can be detected at different stages of the crop cycle. They are seen as brown necrotic spots in the sheaths, poor panicle emergence, grain staining and sterility, although this symptomatology may vary between different geographic regions. The strains of P. fuscovaginae have biochemical-physiological variability, even in the eight tests taken as distinctive of the species. They also have antigenic and molecular variability. Therefore, its diagnosis is complex and requires a polyphasic approach combining biochemical and physiological tests, other phenotypic tests, pathogenicity testing, immunodiagnosis and molecular diagnosis with specific primers or conserved gene sequencing (rDNA 16S, rpoB, rpoD, gyrB, among others) and accessory, individual or concatenated genes.