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Broadening the avenue of intersubgenomic heterosis in oilseed Brassica

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Abstract

Accumulated evidence has shown that each of the three basic Brassica genomes (A, B and C) has undergone profound changes in different species, and has led to the concept of the “subgenome”. Significant intersubgenomic heterosis was observed in hybrids between traditional Brassica napus and first generation lines of new type B. napus. The latter were produced by the partial introgression of subgenomic components from different species into B. napus. To increase the proportion of exotic subgenomic components and thus achieve stronger heterosis, lines of first generation new type B. napus were intercrossed with each other, and subjected to intensive marker-assisted selection to develop the second generation of new type B. napus. The second generation showed better agronomic traits and a higher proportion of introgression of subgenomic components than did the first generation. Compared with the commercial hybrid and the hybrids produced with the first generation new type B. napus, the novel hybrids showed stronger heterosis for seed yield during the 2 years of field trials. The extent of heterosis showed a significant positive correlation with the introgressed subgenomic components in the parental new type B. napus. To increase the content of the exotic subgenomic components further and to allow sustainable breeding of novel lines of new type B. napus, we initiated the development of a gene pool for new type B. napus that contained a substantial amount of genetic variation in the Ar and Cc genome. We discuss new approaches to broaden the avenue of intersubgenomic heterosis in oilseed Brassica.

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Acknowledgments

The authors gratefully acknowledge Dr. Wei Qian (Southwest University of China and Dr. Martin Frauen (Norddeutsche Pflanzenzucht Hans-Georg Lembke KG, Germany) for their provision of data about the yield performance of the intersubgenomic hybrids bred with 14 lines of the new rapeseed first. We also thank Assoc. Prof. Wallace Cowling (The University of Western Australia) for his critical reading and comments on the manuscript. This work was supported financially by the National Natural Science Foundation of China (project code: 30830073) and the National Basic Research and Development Program (project code: 2007CB109006).

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Authors and Affiliations

  1. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, 430070, Wuhan, China

    Jun Zou, Jiali Zhu, Shunmou Huang, Entang Tian, Yong Xiao, Donghui Fu, Jinxing Tu, Tingdong Fu & Jinling Meng

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  1. Jun Zou
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  2. Jiali Zhu
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  3. Shunmou Huang
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  4. Entang Tian
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  5. Yong Xiao
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  6. Donghui Fu
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  7. Jinxing Tu
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  8. Tingdong Fu
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  9. Jinling Meng
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Corresponding author

Correspondence to Jinling Meng.

Additional information

Communicated by H. Becker.

Contribution to the special issue “Heterosis in Plants”.

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Zou, J., Zhu, J., Huang, S. et al. Broadening the avenue of intersubgenomic heterosis in oilseed Brassica . Theor Appl Genet 120, 283–290 (2010). https://doi.org/10.1007/s00122-009-1201-4

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