IngentaConnect Evaluation of Olive Cultivars for Resistance to Verticillium dahl...

Authors: López-Escudero F.J.¹; del Río C.²; Caballero J.M.²; Blanco-López M.A.³

Source: European Journal of Plant Pathology, Volume 110, Number 1, January 2004 , pp. 79-85(7)

Publisher: Springer

Abstract:

Resistance of 23 important olive cultivars to Verticillium dahliae has been evaluated in four experiments under controlled conditions. Nine-month-old nursery olive plants were inoculated with a cotton non-defoliating (ND) (V4) or a cotton defoliating (D) (V117) isolate of V. dahliae. Resistance was evaluated by assessing symptom severity using a 0–4 rating scale and estimating the area under disease progress curves. The percentage of plants killed and of those which recovered from the disease were used as additional parameters for including a particular cultivar into a defined category. Most of the evaluated cultivars were susceptible, although at different levels, to both isolates of V. dahliae. All cultivars were more susceptible to the D pathotype than to the ND one. A group of 11 cultivars, including several important Spanish cultivars, were susceptible or extremely susceptible to both pathotypes of V. dahliae. A second group showed differences of resistance depending on the pathotype used. They were susceptible or extremely susceptible to the D pathotype but resistant or moderately susceptible to the ND one. Finally, 'Frantoio', 'Oblonga' and 'Empeltre' were moderately susceptible to the D isolate of V. dahliae and resistant to the ND one. The resistance of 'Empeltre' was evident by the plant ability to recover from infection with either isolates. 'Empeltre' is considered to be a valuable cultivar for inclusion in breeding programmes for resistance to Verticillium wilt.

Keywords: Verticillium wilt; defoliating and non-defoliating pathotypes; root-dip inoculation; resistant rootstock

Document Type: Research article

DOI: 10.1023/B:EJPP.0000010150.08098.2d

Affiliations: 1: Departamento de Agronomía, ETSIAM, Universidad de Córdoba, Apdo. 3048, 14080 Córdoba, Spain 2: IFAPA, CIFA Alameda del Obispo, Apdo. 3092, 14080, Córdoba, Spain 3: Departamento de Agronomía, ETSIAM, Universidad de Córdoba, Apdo. 3048, 14080 Córdoba, Spain; Author for correspondence (Phone: +34 957218528; 957218569; ), Fax: +34, Email: mblanco@uco.es

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Evaluation of Olive Cultivars for Resistance to Verticillium dahliae