Multi-environmental evaluation of winter oilseed rape genotypic performance using mixed models

Jan Bocianowski,Alina Liersch

doi:10.1007/s10681-020-02760-1

Abstract

The production of winter oilseed rape (WOSR) (Brassica napus) together with increasing seed yields per hectare is one of the strategies for breeding the genetic base of oilseed rape genotypes adapted to different environments. The main objective of this study was to evaluate the genotypic performance of 25 winter oilseed rape genotypes using mixed models. The plant material was examined in five locations in Poland. Field trials were carried out in a randomized complete block design with four replicates. The REML/BLUP was used to estimate genetic parameters. Selection of genotypes was made on the basis of genetic values by the harmonic mean of relative performance these parameters. The mean heritability for genotype had an average value at a high accuracy of selection, while additionally it facilitated selection of agronomically superior individuals. Three restorer lines PN18, PN17 and PN21, CMS ogura line PN64 as well as hybrids PN66 × PN21 and PN64 × PN21 characterized good adaptability and stability of seed yield. There were similarities among the statistics (hat{mu } + hat{g}), adaptability and stability of genetic values in the discrimination of the most productive genotypes by best linear unbiased predictor analysis. Mixed models can be recommended as a potential selection method for the inclusion of new plant material in different oilseed rape breeding programs aimed at developing new WOSR cultivars.

Highlights

Winter oilseed rape (WOSR, rapeseed, canola) (Brassica napus L.) is the most important oil and protein crop in Europe
The plant material used in this study comprised open pollinated cultivar Californium and Hercules F1— hybrid cultivar, 15 Polish Ogura F1 hybrids under development [PN64 9 PN17, PN64 9 PN18, PN64 9 PN21, PN64 9 PN05, PN64 9 PN07, PN66 9 PN17, PN66 9 PN18, PN66 9 PN21, PN66 9 PN05, PN66 9 PN07, PN68 9 PN17, PN68 9 PN18, PN68 9 PN21, PN68 9 PN05, PN68 9 PN07] and their eight parental lines, i.e. three Ogura CMS lines—PN64, PN66, PN68 and five restorer lines—PN05, PN07, PN17, PN18, PN21]
The process of breeding hybrid varieties requires a large number of cross-pollination combinations of parental lines and their evaluation in field trials in terms of general and specific combining ability, with simultaneously very careful selection of the components based on a number of qualitative characteristics and good adaptability for different environments

Summary

Introduction

Winter oilseed rape (WOSR, rapeseed, canola) (Brassica napus L.) is the most important oil and protein crop in Europe. 80 Page 2 of 9 contents are a source of the healthiest vegetable oils with a balanced fatty acid composition (SzydłowskaCzerniak et al 2011). The residual meal from oilseed rape seeds after oil extraction provides a protein-rich (38–44%) animal feed. Thanks to its nutritional value oilseed rape may be considered as an alternative source of protein to replace soya in countries with moderate climate, such as Poland. This meal represents a favorable composition of amino acids, including comparatively high contents of the essential sulfuric amino acids: methionine and cysteine (Downey and Bell 1991). The meal is rich in minerals, Ca, Mg and P, and contains vitamins B4 and E (Thies 1994)

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Conclusion