Abstract:

In order to screen stable and reliable reference varieties for rice new plant variety DUS testing, 117 representative rice varieties of common knowledge from China, Japan and South Korea were used in the field testing experiment for 2 years observation continuously and the reference varieties for 106 expression statuses of 27 characteristics were screened systematically. The results showed that, the 16 varieties which were screened provided not only reference varieties for the characteristics represented by the original 23 reference varieties in the testing guideline, but also the reference varieties for several other characteristic expression statuses which had no reference varieties in the testing guideline. ‘Yuanzizhan’, ‘Tanzi’, ‘Hanlundao’, ‘Qijin’ and ‘Wuzuinuo’ had comparatively strong ecological adaptability and priority should be given for the screening of rice reference varieties in other ecological area. The means of clustering statistical method was very useful for the screen of reference varieties of visual observation characteristics and might be considered as the method in the screen of reference varieties of visual observation characteristics for other plant species.