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Evaluation of yield and agronomic traits and their genetic variation in 488 global collections of Brassica napus L.

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Abstract

It is important to evaluate yield and agronomic traits when selecting for elite lines in Brassica napus L. In this study, 488 global collections of B. napus L. were evaluated for yield and agronomic traits during two consecutive years under growing conditions in central China. A series of phenotypic data for yield and agronomic traits were obtained. Large variations in yield and agronomic traits were found among these accessions, making selection possible for these characters. Chinese accessions, in general, tended to have higher plot yield (POY), higher seed yield per plant (PY), higher thousand-seed weight (TSW), more seeds per silique (SS), and fewer siliques per plant (PS) than foreign accessions. Comparing winter, semi-winter, and spring accessions, semi-winter accessions tended to have the highest POY, highest PY, highest TSW, most SS and fewest PS. Genotypic variation for TSW accounted for 71.23 % of the total variation, and it was the highest for all 12 of the phenotypic traits. Significant correlations were observed between different traits. Principal component analysis (PCA) revealed that significant variation among the traits with the first four principal components could explain 49.8 % of the total variation. Three major groups (winter, spring and semi-winter oilseed rape accessions) could be distinguished when projecting the accessions onto the first two PCAs. The information on variations in yield and agronomic traits detected in this study provided useful parents for rapeseed breeding. Moreover, the phenotypic data on yield and agronomic traits obtained may be used in our subsequent genome-wide association studies for B. napus.

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Acknowledgments

The authors thank anonymous reviewers for their comments on the manuscript and constructive suggestions. This project was sponsored by the National Basic Research Program of China (973 Program) (2011CB109300), Germplasm Resources Protection Project in China (NB 2011–2013013–29).

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Authors and Affiliations

  1. Oil Crop Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Xudong 2th Road No. 2, Wuhan, 430062, China

    Biyun Chen, Kun Xu, Jun Li, Feng Li, Jiangwei Qiao, Hao Li, Guizhen Gao, Guixin Yan & Xiaoming Wu

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  1. Biyun Chen
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  2. Kun Xu
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  3. Jun Li
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  4. Feng Li
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  6. Hao Li
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  7. Guizhen Gao
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  8. Guixin Yan
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  9. Xiaoming Wu
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Correspondence to Xiaoming Wu.

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Chen, B., Xu, K., Li, J. et al. Evaluation of yield and agronomic traits and their genetic variation in 488 global collections of Brassica napus L.. Genet Resour Crop Evol 61, 979–999 (2014). https://doi.org/10.1007/s10722-014-0091-8

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