Quantitative trait loci analysis for the developmental behavior of Soybean (Glycine
max L. Merr.) |
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Authors: | Desheng Sun Wenbin Li Zhongchen Zhang Qingshan Chen Hailong Ning Lijuan Qiu Genlou Sun |
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Institution: | (1) Soybean Research Institute, Key Laboratory of Soybean Biology, Ministry of Education, Northeast Agricultural University Harbin, 150030 Harbin, China;(2) Department of Life Science, University of Zhejiang, Zhejiang, China;(3) Institute of Crop Resources, Chinese Academy of Agriculture, Beijing, China;(4) Biology Department, Saint Mary’s University, Halifax, NS, Canada, B3H 3C3 |
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Abstract: | Quantitative trait loci (QTLs) identified so far in soybean were mainly derived in the final stage of plant development, which
did not apply to the exploitation of genetic effects that were expressed during a specific developmental stage. Thus, the
aim of this study was to identify conditional QTLs associated with yield traits at a specific developmental interval of soybean
plant. The 143 recombinant inbred lines developed from the cross of soybean cultivars ‘Charleston’ and ‘Dongnong 594’ were
used for the developmental QTLs analysis of pod number in the main stem and plant height by composite interval mapping method
combined with mixed genetic model. The results indicated that the number and type of QTLs and their genetic effects for the
two agronomic traits were different in a series of measuring stages. A total of 10 unconditional QTLs in 6 linkage groups
and 5 conditional QTLs in 3 linkage groups were identified for the pod number of the main stem, while 13 unconditional QTLs
in 7 linkage groups and 12 conditional QTLs in 6 linkage groups were identified for plant height. Many QTLs that were detected
in the early stages were different from those detected at the later stages. Some QTLs existed only at one stage and others
existed across two or three stages. Five marker intervals (satt509-satt251, sat_099-sat_113, sat_113-OPAW19_4, satt457-OPC10_85,
sat_095-OPBA08_5) were proven to be associated both with the development of pod number in the main stem and the development
of plant height. The present study suggested that the development of pods and plant height in soybean were governed by time-dependent
gene expression. |
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