Vol: 36 Page: 225

Authors:
Bogna Zawieja
Wiesław Pilarczyk

Title:
 The comparison of decisions on uniformity of rye varieties based on COYU approach and Bennett’s test

Language: English

Keywords:
coefficient of variation
DUS testing
uniformity

Summary:
Every new variety of any species before being listed on national list of varieties and being allowed to enter the market must fulfill so-called DUS requirements. DUS stands here for distinctness (D), uniformity (U) and stability (S). Decisions are usually taken after three (sometimes after two) years of testing in special DUS trials. The average (over years) standard deviations are usually used as a measure of uniformity of varieties for quantitative characteristics. Also in recommended by UPOV method for testing uniformity (it is so-called COYU- combined over years uniformity), variety standard deviations form the basis for such decisions. UPOV is an official acronym of The International Union for the Protection of New Varieties of Plants. In the present paper the decisions concerning distinctness of rye varieties based on traditional (COYU) method and on new method that uses Bennett’s test for coefficients of variations are compared. All considerations are illustrated with trial data concerning winter rye varieties. Both methods use the same results from three year series of DUS trials.