| Abstract Detail
Breeding and Genetics Estrada, Rolando [1], Thompson, Asunta [2], Rivera, Viviana [1], Secor, Gary [1]. Screening of potato breeding selections and cultivars to dry rot pathogens Fusarium graminearum and Fusarium sambucinum. DRY Rot in potatoes is commonly associated with Fusarium sambucinum. Recently, Fusarium graminearum was isolated from potato tubers in commercial storages in North Dakota and Minnesota, showing typical dry rot symptoms. To date, screening for resistance to dry rot has been conducted without considering F. graminearum as a causal agent. Eleven cultivars and four breeding selections from the North Dakota State University potato breeding program were evaluated for resistance to dry rot caused by F. graminearum and F.sambucinum. Potato tubers were inoculated by removing a 5 mm in diameter plug and replacing it with a mycelial plug of actively growing culture, incubated in a plastic tub at a room temperature of 18°C for four weeks. Potato tuber width was measured, as well as the depth of the dry rot lesion, to obtain an infection ratio. There were significant differences among cultivars and breeding selections when challenged with F. graminearum and F. sambucinum inoculations. Some cultivars or breeding selections showed infection rates lower than 10% when inoculated with F. graminearum, but an infection rate above 60% when inoculated with F. sambucinum. Differences were observed between the two species on both cultivars and selections. F. sambucinum rate of infection was higher in every case, while cultivars and breeding selections appeared to be more tolerant to F. graminearum infection. This data suggests that F. graminearum infection severity is lower than F. sambucinum. It also indicates that even when a genotype seems to be tolerant to one Fusarium species, it may be susceptible to the other, suggesting that resistance is mediated differently in each case. Therefore, when breeding for resistance to dry rot, each species should be considered separately.
Log in to add this item to your schedule
Related Links:
First report of Fusarium graminearum causing dry rot in potato
1 - North Dakota State University, Department of Plant Pathology, 306 Walster Hall, Fargo, ND, 58105, USA
2 - North Dakota State University, Plant Sciences, 370F Foftsgard Hall, Fargo, ND, 58105
Keywords:
potato dry rot
Fusarium graminearum and Fusarium sambucinum.
Session: PAA09-1
Location: Hall of Ideas Room G/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 1:30 PM
Abstract ID:84 |
