Beukert Ulrike, Li Zuo, Liu Guozheng, Zhao Yusheng, Ramachandra Nadhigade, Mirdita Vilson, Pita Fabiano, Pillen Klaus, Reif Jochen Christoph
Department of Breeding Research, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Corrensstraße 3, 06466, Stadt Seeland, Germany.
Bayer Bioscience, 500081, Hyderabad, India.
Rice (N Y). 2017 Dec;10(1):22. doi: 10.1186/s12284-017-0163-4. Epub 2017 May 19.
Hybrid rice breeding facilitates to increase grain yield and yield stability. Long-term success of hybrid breeding depends on the recognition of high-yielding complementary heterotic patterns, which is lacking in crops like rice.
The main goal of this study was to evaluate the potential and limits to use genomics for establishing heterotic patterns in rice. For this purpose, data of a commercial hybrid rice breeding program targeted to India was analyzed, including 1,960 phenotyped hybrids from three market segments and 262 genotyped parental lines. Our cross-validation study revealed that grain yield of all potential single-crosses can be accurately predicted. Based on the full matrix of hybrid performances, high-yielding heterotic patterns were identified. These heterotic patterns increased grain yield up to 9% compared to the currently employed groups. Heterotic groups of around 14 individuals reflect a good compromise between long-term and short-term selection response.
Our findings clearly underlined the benefits of a genome-based establishment of heterotic patterns in rice as a requirement for a sustainable long-term success of hybrid rice breeding.
杂交水稻育种有助于提高粮食产量和产量稳定性。杂交育种的长期成功取决于对高产互补杂种优势模式的认识，而水稻等作物缺乏这种认识。
本研究的主要目标是评估利用基因组学建立水稻杂种优势模式的潜力和局限性。为此，分析了一个针对印度的商业杂交水稻育种项目的数据，包括来自三个市场细分的1960个表型杂交种和262个基因型亲本系。我们的交叉验证研究表明，所有潜在单交种的籽粒产量都可以准确预测。基于杂交表现的完整矩阵，确定了高产杂种优势模式。与目前使用的群体相比，这些杂种优势模式使籽粒产量提高了9%。大约14个个体的杂种优势群反映了长期和短期选择反应之间的良好折衷。
我们的研究结果清楚地强调了基于基因组建立水稻杂种优势模式的好处，这是杂交水稻育种可持续长期成功的必要条件。
