文献类型： 外文期刊
作者： Yan, Xu 1 ; Cheng, Mingjun 1 ; Li, Yingzheng 1 ; Wu, Zizhou 1 ; Li, Yang 1 ; Li, Xiaofeng 1 ; He, Ruyu 1 ; Yang, Chunyan; 1 ;
作者机构： 1.Sichuan Agr Univ, Maize Res Inst, 211 Huimin Rd Wenjiang Dist, Chengdu 611130, Peoples R China
2.Sichuan Acad Agr Sci, Anim Husb Res Ctr, Nanchong 637000, Peoples R China
3.Sichuan Acad Agr Sci, Sericulture Res Inst, Nanchong 637000, Peoples R China
4.Sichuan Grass Ind Technol Res & Promot Ctr, Chengdu 610041, Peoples R China
5.Guizhou Prataculture Inst, Guiyang 550006, Peoples R China
6.Neijiang Acad Agr Sci, Inst Forestry & Pomol, Neijiang 641000, Peoples R China
关键词： Zea mays; Tripsacum dactyloides; Zea perennis; trihybrid; maize improvement; forage breeding
期刊名称：G3-GENES GENOMES GENETICS （ 影响因子：3.154； 五年影响因子：3.369 ）
ISSN： 2160-1836
年卷期： 2020 年 10 卷 2 期
页码：
收录情况： SCI
摘要： A trispecific hybrid, MTP (hereafter called tripsazea), was developed from intergeneric crosses involving tetraploid Zea mays (2n = 4x = 40, genome: MMMM), tetraploid Tripsacum dactyloides (2n = 4x = 72, TTTT), and tetraploid Z. perennis (2n = 4x = 40, PPPP). On crossing maize-Tripsacum (2n = 4x = 56, MMTT) with Z. perennis, 37 progenies with varying chromosome numbers (36-74) were obtained, and a special one (i.e., tripsazea) possessing 2n = 74 chromosomes was generated. Tripsazea is perennial and expresses phenotypic characteristics affected by its progenitor parent. Flow cytometry analysis of tripsazea and its parents showed that tripsazea underwent DNA sequence elimination during allohexaploidization. Of all the chromosomes in diakinesis I, 18.42% participated in heterogenetic pairing, including 16.43% between the M- and P-genomes, 1.59% between the M- and T-genomes, and 0.39% in T- and P-genome pairing. Tripsazea is male sterile and partly female fertile. In comparison with previously synthesized trihybrids containing maize, Tripsacum and teosinte, tripsazea has a higher chromosome number, higher seed setting rate, and vegetative propagation ability of stand and stem. However, few trihybrids possess these valuable traits at the same time. The potential of tripsazea is discussed with respect to the deployment of the genetic bridge for maize improvement and forage breeding.
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