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Tripsazea, a Novel Trihybrid of Zea mays , Tripsacum dactyloides , and Zea perennis .

时间： 2020-11-26 点击次数：次

作者:
作者背景:

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Animal Husbandry Research Center.

  • Sericulture Research Institute, Sichuan Academy of Agricultural Sciences, Nanchong 637000, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Sichuan Grass Industry Technology Research and Promotion Center, Chengdu 610041, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Guizhou Prataculture Institute, Guiyang 550006, China, and.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Institue of Forestry and Pomology, Neijiang Academy of Agricultural Sciences, Neijiang 641000, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China.

  • Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China, tangqilin71@163.com.

DOI: 10.1534/g3.119.400942
文章关键词: Tripsacum dactyloides,Zea mays,Zea perennis,Forage breeding,Maize improvement,Trihybrid
原文摘要: A trispecific hybrid, MTP (hereafter called tripsazea), was developed from intergeneric crosses involving tetraploid Zea mays (2 n = 4 x = 40, genome: MMMM), tetraploid Tripsacum dactyloides (2 n = 4 x = 72, TTTT), and tetraploid Z perennis (2 n = 4 x = 40, PPPP). On crossing maize- Tripsacum (2 n = 4 x = 56, MMTT) with Z perennis , 37 progenies with varying chromosome numbers (36-74) were obtained, and a special one ( i.e. , tripsazea) possessing 2 n = 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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