Mapping quantitative trait loci associated with stem-related traits in maize ( Zea mays L.)
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Mapping quantitative trait loci associated with stem‑related traits in maize (Zea mays L.) Qiqi Shang1 · Degui Zhang2 · Rong Li1 · Kaixin Wang1 · Zimeng Cheng1 · Zhiqiang Zhou2 · Zhuanfang Hao2 · Jinbao Pan1 · Xinhai Li2 · Liyu Shi1 Received: 6 May 2020 / Accepted: 27 August 2020 © Springer Nature B.V. 2020
Abstract Key message Mapping QTL for stem-related traits using RIL population with ultra-high density bin map can better dissect pleiotropic QTL controlling stem architecture that can provide valuable information for maize genetic improvement. Abstract The maize stem is one of the most important parts of the plant and is also a component of many agronomic traits in maize. This study aimed to advance our understanding of the genetic mechanisms underlying maize stem traits. A recombinant inbred line (RIL) population derived from a cross between Ye478 and Qi319 was used to identify quantitative trait loci (QTL) controlling stem height (SH), ear height (EH), stem node number (SN), ear node (EN), and stem diameter (SD), and two derived traits (ear height coefficient (EHc) and ear node coefficient (ENc)). Using an available ultra-high density bin map, 46 putative QTL for these traits were detected on chromosomes 1, 3, 4, 5, 6, 7, 8, and 10. Individual QTL explained 3.5–17.7% of the phenotypic variance in different environments. Two QTL for SH, three for EH, two for EHc, one for SN, one for EN, and one for SD were detected in more than one environment. QTL with pleiotropic effects or multiple linked QTL were also identified on chromosomes 1, 3, 4, 6, 8, and 10, which are potential target regions for fine-mapping and marker-assisted selection in maize breeding programs. Further, we discussed segregation of bin markers (mk1630 and mk4452) associated with EHc QTL in the RIL population. We had identified two putative WRKY DNA-binding domain proteins, AC209050.3_FG003 and GRMZM5G851490, and a putative auxin response factor, GRMZM2G437460, which might be involved in regulating plant growth and development, as candidate genes for the control of stem architecture. Keywords Maize · RIL population · Stem architecture · Quantitative trait loci · Candidate genes
Qiqi Shang, Degui Zhang and Rong Li have contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11103-020-01062-3) contains supplementary material, which is available to authorized users. * Xinhai Li [email protected] * Liyu Shi [email protected] 1
College of Plant Science and Technology, Beijing University of Agriculture, 7 Beinong Road, Changping District, Beijing 102206, China
Institute of Crop Science, The National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences (CAAS), 12 Zhongguancun South Street, Beijing 100081, China
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Abbreviations SH Stem height EH Ear height EHc Ear height coefficient, EH/SH SN Stem node number EN Ear node ENc Ear node coefficient, EN/SN SD Stem diameter MAS Marker-assisted selection QTL Q
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