Resistance Behaviour of Potato Cultivars and Advanced Breeding Clones to Tuber Soft Rot Caused by Pectobacterium atrosepticum

Abstract

Genetic resistance is one of the best methods to control bacterial soft rot of potato tubers. However, an extensive description of resistance levels in currently registered cultivars is not available, as the literature contains only scattered reports. Using a half-tuber test, we therefore investigated the resistance to Pectobacterium atrosepticum of 93 potato cultivars registered on the French National List between 1935 and 1987, and 157 candidates for registration between 1987 and 1997. The relative ranking in a set of 11 control cultivars was stable over the 11 test years, with Ackersegen, Daresa and Bintje being the most susceptible and Kerpondy, Sirtéma and Kaptah Vandel being the most resistant. Both registered and candidate cultivars showed a wide distribution of mean rot volumes six days after inoculation, irrespective of cultivar type (ware, starch, or firm-flesh). Mean resistance was significantly higher in recently bred than in older cultivars.

Proteins Involved in the Interaction of Potato Tubers with Pectobacterium atrosepticum: a Proteomic Approach to Understanding Partial Resistance

“…These observations are consistent with the susceptibility differences between these cultivars already reported (Pasco et al. ).…”

“…Indeed, as reported by Pasco et al. (), all cultivars are susceptible to infection by this bacterium, with whatever quantitative differences in disease severity. The physiological and biochemical basis of such partial resistance are still insufficiently understood.…”

Salicylic and jasmonic acid pathways are necessary for defence against Dickeya solani as revealed by a novel method for Blackleg disease screening of in vitro grown potato

“…) as well as having other unwanted traits (Pasco et al . ). Interestingly, there have been some promising advances through generation of transgenic potato plants that produce chicken lysozymes or overexpress pectate lyase, but although these transgenic plants are more resistant to P. atrosepticum and P. carotovorum , there is a long way before they can enter agricultural practice due to problems such as fitness cost associated with these modifications (Czajkowski et al .…”

Incidence of potato blackleg caused by Pectobacterium atrosepticum in district Chiniot and its management through bio-products

“…carotovora and assessed these using single site, infectivity titration and vacuum infiltration tests. Similarly many potato varieties were found resistant during the experiments conducted by Pasco et al (2006).…”

“…The Genetic resistance is regarded as one of the best methods for the control of bacterial blackleg of potato tubers (Pasco et al, 2006) and according to RousselleBourgeois and Sylvie (1995), the major cause of blackleg/soft rot of stored potatoes is E. carotovora subsp. carotovora and resistant varieties play the major role for the control of this disease.…”