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Allopolyploidization facilitates gene flow and speciation among corn, Zea perennis and Tripsacum dactyloides

文献类型： 外文期刊

作者： Iqball, Muhammad Zafar 1 ; Cheng, Mingjun 1 ; Su, Yuegu 1 ; Li, Yang 1 ; Jiang, Weiming 1 ; Li, Huaxiong 5 ; Zhao, Yan 1 ;

作者机构： 1.Sichuan Agr Univ, Maize Res Inst, Chengdu 611130, Sichuan, Peoples R China

2.Sichuan Grass Ind Technol Res & Promot Ctr, Chengdu 610041, Sichuan, Peoples R China

3.Guangxi Acad Agr Sci, Maize Res Inst, Nanning 530007, Guangxi, Peoples R China

4.Sichuan Agr Univ, Rice Res Inst, Chengdu 610041, Sichuan, Peoples R China

5.Neijiang Acad Agr Sci, Inst Forestry & Pomol, Neijiang, Sichuan, Peoples R China

关键词： Apomixes; Chromosome translocation; Eastern gamagrass; Germplasm expansion; Perennial tetraploid teosinte; Tri-genomic bridge plant

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

ISSN： 0032-0935

年卷期： 2019 年 249 卷 6 期

页码：

收录情况： SCI

摘要： Main conclusionTripsacum dactyloides is closely related to Zea mays since Zea perennis and the MTP tri- species hybrid have four possible reproductive modes.Eastern gamagrass (Tripsacum dactyloides L.) and tetraploid perennial teosinte (Zea perennis) are well known to possess genes conferring resistance against biotic and abiotic stresses as well as adaptation to flood and aluminum toxic soils. However, plant breeders have been hampered to utilize these and other beneficial traits for maize improvement due to sterility in their hybrids. By crossing a tetraploid maize-inbred line x T. dactyloides, a female fertile hybrid was produced that was crossed with Z. perennis to yield a tri-genomic female fertile hybrid, which was backcrossed with diploid maize to produce BC1 and BC2. The tri-genomic hybrid provided a new way to transfer genetic material from both species into maize by utilizing conventional plant breeding methods. On the basis of cytogenetic observations using multi-color genomic in situ hybridization, the progenies were classified into four groups, in which chromosomes could be scaled both up and down with ease to produce material for varying breeding and genetic purposes via apomixis or sexual reproduction. In the present study, pathways were found to recover maize and to obtain specific translocations as well as a speedy recovery of the T. dactyloides-maize addition line in a second backcross generation. However, phenotypes of the recovered maize were in most cases far from maize as a result of genetic load from T. dactyloides and Z. perennis, and could not be directly used as a maize-inbred line but could serve as an intermediate material for maize improvement. A series of hybrids was produced (having varying chromosome number, constitution, and translocations) with agronomic traits from all three parental species. The present study provides an application of overcoming the initial interspecific barriers among these species. Moreover, T. dactyloides is closely related to Z. mays L. ssp. mays since Z. perennis and the MTP tri- species hybrid have four possible reproductive modes.

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