文献类型： 外文期刊

第一作者： Luo, Jiangtao

作者： Luo, Jiangtao;Liu, Zhongqi;Xiao, Ziquan;Rao, Shida;Zheng, Jianmin;Liu, Peixun;Deng, Qingyan;Pu, Zongjun;Ren, Yong;Tao, Jun;Li, Shengrong;Tian, Ning;Liu, Zhongqi

作者机构：

关键词： hybrid wheat; T. timopheevii cytoplasm three line; thermo-photo sensitive; chemical-hybridizing agent; dwarf male-sterile wheat line with a blue seed marker

期刊名称：CHINESE SCIENCE BULLETIN-CHINESE （ 影响因子：1.1； ）

ISSN： 0023-074X

年卷期： 2022 年 67 卷 26 期

页码：

收录情况： SCI

摘要： Sichuan Province is an important wheat-producing region in China. Breeding of hybrid wheat and research related to this topic have been conducted for more than 50 years in Sichuan. Both three-line and two-line methods have been used for breeding. Three-line hybrid wheat has been developed mainly using cytoplasmic male sterility (CMS) systems derived from other wild relatives. Among them, the Triticum timopheevii-based CMS (T-type) system is considered to be the best, and has therefore attracted most attention. Fertility restoration in lines carrying the timopheevii cytoplasm is often only partial, so different crossing and selection methods have been proposed to pyramid two or more Rf genes in restorer lines. However, this can be difficult to track because there is a lack of functional markers or associated molecular markers. Various restorer lines and combinations have been developed and tested, but no new commercial varieties have been released in Sichuan. The recent cloning of Rf1 and Rf2 genes has laid the foundation to develop effective restorer lines that may promote hybrid wheat breeding using the T-type three-line system. Hybrid wheat breeding programs based on the two-line system have generally been more successful in Sichuan. Two systems, photoperiod and temperature-sensitive genic male sterility (PTGMS) and chemical-hybridizing agent-induced male sterility (CHAMS), have been used for two-line hybrid wheat breeding. Mianyang 32 and Mianzamai 168, two hybrid wheat varieties developed using the PTGMS system, have been approved through national yield trials, and another two, Mianzamai 512 and Mianzamai 638, have been approved through provincial yield trials. For the CHAMS system. different types of chemical agents have been screened to determine their effectiveness and suitable doses to induce male sterility, and two new hybrid wheat varieties, Chuanmai 59 and Chuanrnai 69. have been approved for release. The Taigu genic dominant male sterile system has also been studied in Sichuan. A new male-sterile line was bred by adding a single rearranged chromosome carrying Ms2. Rht10, and the blue aleurone layer gene from 4E (lgropyron elongatum). When this type of male-sterile line is crossed with a restorer line, about 20% of the progeny are male-sterile lines with short plant height and blue aleurone markers. This demonstrates the low reproduction coefficient of this sterile line. Another problem is the ability to maintain the integrity of the monosomic chromosome during meiosis. Until now, this system has not been used successfully to breed new hybrid wheat varieties in Sichuan. To summarize, there have been some important achievements in hybrid wheat breeding and research in Sichuan. For the sustainable development of hybrid wheat in Sichuan. it is important to improve the existing technical systems and develop and use new hybrid wheat breeding systems. By comparing the advantages and disadvantages of various hybrid wheat systems and combining them with new wheat production practices, we can develop strategies to further improve hybrid wheat in the future from the aspects of heterosis development and utilization, persistent disease resistance, economic benefits, and high yield and quality.

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