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QTL Mapping of Low-Temperature Germination Ability in the Maize IBM Syn4 RIL Population
PloS One
  • Shuaidong Hu, Zhejiang Agriculture and Forestry University
  • Thomas Lubberstedt, Iowa State University
  • Guangwu Guangwu Zhao, Zhejiang Agriculture and Forestry University
  • Michael Lee, Iowa State University
Document Type
Article
Publication Date
3-31-2016
DOI
10.1371/journal.pone.0152795
Abstract

Low temperature is the primary factor to affect maize sowing in early spring. It is, therefore, vital for maize breeding programs to improve tolerance to low temperatures at seed germination stage. However, little is known about maize QTL involved in low-temperature germination ability. 243 lines of the intermated B73×Mo17 (IBM) Syn4 recombinant inbred line (RIL) population was used for QTL analysis of low-temperature germination ability. There were significant differences in germination-related traits under both conditions of low temperature (12°C/16h, 18°C/8h) and optimum temperature (28°C/24h) between the parental lines. Only three QTL were identified for controlling optimum-temperature germination rate. Six QTL controlling low-temperature germination rate were detected on chromosome 4, 5, 6, 7 and 9, and contribution rate of single QTL explained between 3.39%~11.29%. In addition, six QTL controlling low-temperature primary root length were detected in chromosome 4, 5, 6, and 9, and the contribution rate of single QTL explained between 3.96%~8.41%. Four pairs of QTL were located at the same chromosome position and together controlled germination rate and primary root length under low temperature condition. The nearest markers apart from the corresponding QTL (only 0.01 cM) were umc1303 (265.1 cM) on chromosome 4, umc1 (246.4 cM) on chromosome 5, umc62 (459.1 cM) on chromosome 6, bnl14.28a (477.4 cM) on chromosome 9, respectively. A total of 3155 candidate genes were extracted from nine separate intervals based on the Maize Genetics and Genomics Database (http://www.maizegdb.org). Five candidate genes were selected for analysis as candidates putatively affecting seed germination and seedling growth at low temperature. The results provided a basis for further fine mapping, molecular marker assisted breeding and functional study of cold-tolerance at the stage of seed germination in maize.

Comments

This article is published as Hu, Shuaidong, Thomas Lübberstedt, Guangwu Zhao, and Michael Lee. "QTL mapping of low-temperature germination ability in the maize IBM Syn4 RIL population." PloS one 11, no. 3 (2016): e0152795. doi:10.1371/journal.pone.0152795. Posted with permission.

Creative Commons License
Creative Commons Attribution 4.0 International
Copyright Owner
The Authors
Language
en
File Format
application/pdf
Citation Information
Shuaidong Hu, Thomas Lubberstedt, Guangwu Guangwu Zhao and Michael Lee. "QTL Mapping of Low-Temperature Germination Ability in the Maize IBM Syn4 RIL Population" PloS One Vol. 11 Iss. 3 (2016)
Available at: http://works.bepress.com/thomas-lubberstedt/47/