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Construction of maize–teosinte introgression line population and identification of major quantitative trait loci

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Abstract

Maize (Zea mays L.) is a staple food and energy crop worldwide. As the closest related wild progenitor of maize, teosinte (Z. mays ssp. Parviglumis) can, therefore, be a rich resource for useful variants lost during domestication. Here, we used the maize inbred line, B73, as the recurrent parent and a teosinte subspecies, K67-11, as the donor, and constructed a introgression line (IL) population. In brief, 10 K single nucleotide polymorphism (SNP) chips were used to genotype 135 maize–teosinte ILs from the BC2F4 population. Then, quantitative trait locus (QTL) mapping was performed for five plant-type and five ear traits across two different environments. In total, 94 putative QTLs were detected in a single environment analysis, whereas 14 QTLs were detected in two environments. In the whole genome, four regions controlling multiple traits were detected by comparing QTL distribution. Thus, these segments were possibly related to the functional regions controlling the aforementioned traits of maize. These results may not only be helpful for fine-mapping of major QTLs related to important agronomic traits in maize but also provide a valuable reference for molecular marker-assisted breeding and related basic research in maize.

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Abbreviations

ILs:

Introgression lines

RILs:

Recombinant inbred lines

QTL:

Quantitative trait loci

GZ:

Guangzhou

ZH:

Zhuhai

MAS:

Marker-assisted selection

SNP:

Single nucleotide polymorphism

PH:

Plant height

EH:

Ear height

TBN:

Tassel branches number

NE:

Number of ears

LNAE:

Leaf number above ear

EL:

Ear length

ED:

Ear diameter

KNR:

Kernel number per row

KRN:

Kernel row number

SL:

Shank length

DAP:

Days after pollination

RRGB:

Recovery rate of genetic background

PVE:

Phenotypic variation explanation

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (32101706), the Natural Science Foundation of Guangdong Province of China (2021A1515010552), the Key Area Research and Development Program of Guangdong Province, China (2018B020202013), Science and Technology Innovation Team of Hubei University of Arts and Sciences(2021kptd01), and Xiangyang Youth Science and Technology Talent Development Plan.

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Correspondence to Lihong Zhai or Jun Huang.

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Wang, X., Liao, C., Wang, X. et al. Construction of maize–teosinte introgression line population and identification of major quantitative trait loci. Euphytica 217, 179 (2021). https://doi.org/10.1007/s10681-021-02912-x

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  • DOI: https://doi.org/10.1007/s10681-021-02912-x

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