Field resistance of selected potato clones to early blight.

Abstract:

Six potato clones, selected in vitro for their resistance to Alternaria solani Sor. culture filtrates, were evaluated for their field response to early blight infection. Field screening were performance under artificial inoculation and natural conditions. Early blight response was evaluated based on lesion size, disease severity, and area under disease progress curve (AUDPC). One clone displayed reduced lesion area (0.35 cm 2) and AUDPC values compared to cv.'Desirée'(susceptible control)(0.58 cm 2) but those values were higher than that of the resistant control Solanum chacoense'PI 275136'(0.14 cm 2). On the other hand, no differences in lesion number were detected between the susceptible control and the selected clones. This variable showed values between 21.82 and 23.87 lesions in two leaves per plant. Although early blight resistance in potato is generally associated to late maturity, the mutant IBP-27 displayed increased resistance to early blight with medium-late maturity. The six clones presented medium-early to medium-late maturity, similar to parental cv.'Desirée'(vegetative cycle ranging from 90 to 110 days). One clone was found to have higher levels of resistant to early blight than cv.'Desirée'but lower than the levels of the resistant control S. chacoense. The resistance in this clone was characterized by the reduction in lesion area, disease severity, and AUDPC values in both artificial inoculation and natural infection screening.

Año de publicación:

2014

Keywords:

Fuente:

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