Genetic variation in Fusarium oxysporum f. sp. conglutinans strains causing fusarium-wilt of canola in Western Canada
Fusarium wilt of canola (Brassica napus L.), caused by Fusarium axysporum f.sp conglutinans (Wollenweber) Snyder & Hansen(FOC), is a disease that has recently been discovered in Western Canada. It has already been observed that canola cultivars differ in their susceptibility to this disease, with resistance likely coming predominantly from a monogenic source. Breeders and pathologists have been interested in investigating the variation in the pathogen population to assist breeding efforts. Sequence related amplified polymorphism (SRAP) molecular analysis was used on 89 isolates of the pathogen isolated from fusariuminfected canola plants grown throughout Manitoba, Saskatchewan and Alberta. A very high percentage (99％) of variation was caused by diversity within geographic populations, with the number of polymorphic loci (γ) within each population ranging from 100 ％ for Alberta, 97％ for Saskatchewan. However the r-value for Manitoba was only 30％, probably due to the low＃ of isolates.On the other hand Neis genetic distance didnt differentiate the three geographic populations as they clustered as one group on the dendrogram probably due to gene flow among the Fusarium oxysporum populations occurring across Western Canada. The isolates from different host species were diverse in genetics. Our data suggests that there are significant polymorphisms between FOC strains implicating diversity among isolates from Western Canada. To our knowledge, this is the first report of the genetic variation determination of the fusarium-wilt pathogen strains from canola.
Canola Brassiea napus Fusarium oxysporum f. sp. conglutinans genetic variation fusarium-wilt
Jeremy Klassen CHEN Yu Ralph Lange W.G.Dilantha Fernando
University of Manitoba, Department of Plant Science, Winnipeg, MB Canada R3T 2N2 Alberta Research Council, Vergreville, Alberta Canada T9C 1T4.
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
433-435
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）