Comparison of some indices for evaluating wide adaptation degree of cultivars on the basis of data from pre-registration trials with winter wheat
Marzena Iwańska
marzena_iwanska@sggw.edu.plKatedra Doświadczalnictwa i Bioinformatyki SGGW w Warszawie (Poland)
Wiesław Mądry
Katedra Doświadczalnictwa i Bioinformatyki SGGW w Warszawie (Poland)
Anna Rajfura
Katedra Doświadczalnictwa i Bioinformatyki SGGW w Warszawie (Poland)
Tadeusz Drzazga
Hodowla Roślin Rolniczych — Nasiona Kobierzyc w Kobierzycach (Poland)
Abstract
In experimental design and plant breeding a wide adaptation degree of the cultivar is understood as the combined information on genotypic mean of yield and Shukla’s stability variance, to serve as a measure of the degree of yield stability of this cultivar in a given region of its cultivation. If both the genotypic yield mean and the degree of yield stability of the cultivar increase, the degree of wide adaptation of this cultivar also increases. The effective measures for wide adaptation degree of cultivars are expected to represent the combined information on a genotypic mean of yield and stability variance. Then, they should be strongly correlated both with a genotypic mean of yield and with stability variance, and ought to put the cultivars in order in a similar way like the measures that are in a balanced way determined by genotypic mean yield and stability variance. The measures that fulfill the above requirements are believed to reflect a relatively large degree of wide adaptation. The aim of the study was to compare the suitability of the measures to be used as criteria for selecting cultivars that show a relatively large degree of wide adaptation. In the analysis, one nonparametric measure (Kang’s yield stability measure, YS) and four parametric measures: 1) reliability index of yield outperforming, R(0), 2) mean value of yield outperforming reliability, MR, 3) superiority index, P, and 4) yield reliability index, I, were applied. The work was performed using data for grain yield obtained in three pre-registration cultivar trials with winter wheat done in the years 1994, 2000 and 2006. The measures Ii(0.90) and Ii(0.95) were found to be the most suitable tools for estimating a relative degree of wide adaptation, as they put in a similar order all the cultivars under study as well as about 40% of cultivars producing the highest yields. The measures YSi, Ri(0), MRi and Pi appeared to be less useful in assessing a degree of wide adaptation of all winter wheat cultivars tested and of 40% of those giving the best yields. However, the measures Ii(0.90) and Ii(0.95) , as compared to the other ones, turned out to be the worse tool in determining a relative degree of wide adaptation in 20% of the cultivars producing the highest yields.
Keywords:
grain yield, pre-registration trials, statistical measures, wide adaptation degree, winter wheatReferences
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Authors
Marzena Iwańskamarzena_iwanska@sggw.edu.pl
Katedra Doświadczalnictwa i Bioinformatyki SGGW w Warszawie Poland
Authors
Wiesław MądryKatedra Doświadczalnictwa i Bioinformatyki SGGW w Warszawie Poland
Authors
Anna RajfuraKatedra Doświadczalnictwa i Bioinformatyki SGGW w Warszawie Poland
Authors
Tadeusz DrzazgaHodowla Roślin Rolniczych — Nasiona Kobierzyc w Kobierzycach Poland
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