| 論文英文摘要 |
Anthracnose, caused by Colletotrichum spp., is a devastating disease to strawberry. The pathogen can infect the whole strawberry plant at all growth stages. The predominant Colletotrichum spp. causing strawberry anthracnose in Taiwan are C. siamense and C. fructicola that account for 75% and 11%, respectively. 'Taoyuan no.1', one of the most popular strawberry cultivars in Taiwan, is highly susceptible to anthracnose. New cultivars with desirable horticultural traits and high resistance (tolerance) to diseases are in high demand. Strawberry germplasm resources in Taiwan are preserved in Wufong Branch Station at Taoyuan District Agricultural and Research Extension Stations and Biological Control Branch at Miaoli District Agricultural and Research Extension Stations. To understand the resistance/susceptibility of the strawberry cultivars/ lines in the germplasm, with the consideration of reducing the consumption of experiment seedlings, we established an inoculation system which allows simultaneous evaluation of anthracnose leaf blight and crown rot. Total 55 cultivars/lines were inoculated with two domestic highly pathogenic representative isolates - C. siamense ML133 and C. fructicola ML356. High level of leaf resistance was observed from 14 cultivars/lines. Their percentages of disease leaf area were less than 10%, which was significantly lower than the susceptible control 'Taoyuan no.1' inoculated with ML133 (42.4%). Seven cultivars/lines showed less than 20% of diseased crown area, but only 'TYS16109' (< 10% for inoculations of both isolates) was significantly different from 'Taoyuan no.1' inoculated with ML133 (53.5%). No significant correlation was observed between the degrees of disease in leaves and crowns caused by the same isolate (ML133: r = 0.23, p = 0.112; ML356: r = 0.06, p = 0.686). According to the inoculation tests in this study, 'TS4', 'Rassen', 'TS13', '久留米103' and 'TYS16109' showed good leaf resistance and less than 20% of diseased crown area. In particularly, 'TYS16109' exhibited high level of both leaf and crown resistance. These cultivars/lines can be used as parental lines for resistance breeding in the future. |