Effects of specific gravity and cultivar on susceptibility of potato (Solanum tuberosum) tubers to blackspot bruising and bacterial soft rot

Abstract

Ten potato (Solanum tuberosum) cultivars were assessed for resistance to bacterial soft rot caused by Erwinia carotovora subsp. atroseptica, and to blackspot bruising. Specific gravities of individual potato tubers varied within each cultivar and between cultivars. Within all 10 cultivars tested, as tuber-specific gravity increased, the severity of bacterial soft rot decreased, and the severity of bruising increased. Among the seven New Zealand-bred cultivars, mean soft rot susceptibilities lay along a continuum, with cultivars having higher mean soft rot losses as mean specific gravity increased. Two of the three overseas cultivars exhibited very different responses from those bred in New Zealand. In contrast, for blackspot bruising, six of the New Zealand-bred cultivars and two overseas cultivars lay approximately on a continuum of increasing mean bruise score as mean specific gravity increased, similar to the within-cultivar relationships. The remaining New Zealand-bred cultivar and the overseas cultivar 'Fianna' were quite different, having much lower m ean bruise scores than predicted by the trend line of the other cultivars. 'Fianna' in particular exhibited both low bruising and low soft rot incidence in this experiment.

QTLs for potato tuber resistance toDickeya solaniare located on chromosomes II and IV

“…There are reports that potato cultivars with a high content of dry matter are less susceptible to bacterial soft rot than tubers with lower dry matter contents; however, the relationship between the resistance and tuber starch content is not clear (Biehn et al 1972; Tzeng et al 1990; Wright et al 2005; Zimnoch-Guzowska and Łojkowska 1993). A study in unselected diploid populations of Solanum spp.…”

Specific Gravity Analysis of Onion Peel and Snail Shell Particulates as Composite Fillers in Ship Applications

“…Siciliano-Jones and Murphy [9] established the specific gravity of various feedstuffs and their association with a particle size as well as in vitro fermentation. Wright et al [10] analyzed the influences of specific gravity as well as cultivar on potato tubers' likehoods of having bacterial.…”