A national system for comparative rating of blackleg resistance in Brassica napus L. cultivars in Australia
Blackleg is the major disease of canola in Australia. Consequently, farmers choose canola cultivars based on their level of blackleg resistance. During the 1990s, companies published their own blackleg ratings leading to confusion amongst farmers. To overcome this situation, a national system for comparative rating of blackleg resistance has been established in Australia for the past 6 years. The system is coordinated by the Canola Association of Australia. Protocols for testing and minimum standards that have to be met for the inclusion of data have been devised. Data can be submitted by public and private researchers provided the blackleg nurseries have been quality assured by independent observers. Data from all nurseries are combined for analysis using all relevant nurseries from three years of testing prior to and including the current year. Minimum disease severity standards are enforced where the survival of a nominated susceptible control cultivar must be less than 30％ in conventional and triazine tolerant trials and 40％ for Clearfield trials (more susceptible Clearfield cultivars are not available). The analysis accommodates error variance heterogeneity between trials and spatial variation within trials, thereby increasing the accuracy and precision of cultivar estimates. The analysed results are arithmetically converted to a 1-9 scale with 9 representing the line/cultivar with the highest survival and 1 representing the lowest survival. Cultivars with less than 6 site years over two calendar years are given a provisional rating. Ratings are managed and presented to farmers by the Canola Association of Australia. Correlations between sites and years have been very high indicating that the national ratings are a very robust system.
Canola Brassica napus blackleg rating system Australia
Trent Potter Neil Wratten Chris Lisle Steve Marcroft
South Australian Research and Development Institute Naracoorte 5271 Australia New South Wales Department of Primary Industries Wagga Wagga 2650 Australia Marcroft Grains Pathology Horsham 3400 Australia
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
1269-1271
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）