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. 2020 Mar 6;11:252. doi: 10.3389/fpls.2020.00252

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Copyright © 2020 Hao, Zhang, Ning, Huang, Yuan, Wu, Yan, Dai, Jiang, Zheng and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The double top-cross (DTC) and two phase selection (2PS) strategies deployed to manage introgression into elite germplasm from an SHW. The DTC populations retain on average 12.5% of the nuclear genome of the SHW parent. The aim of the first selection phase, carried out in the F₂ and F₃ generations, is to eliminate serious agronomic defects, while that of the second phase (applied from the F₄ generation onward) is to improve yield. Shumai 969 and Shumai 830 were both bred using this strategy.