Reference Report for JRS20180531.1
| Title: | Identification of QTLs for branching in soybean (Glycine max (L.) Merrill) |
| Authors: | Shim, S., Kim, M., Ha, J., Lee, Y., Lee, S. |
| Source: | Euphytica (2017) 213-225 |
| Abstract: | In soybean, the number of branches directly affects total pod number per plant. In this study, we sought to identify QTLs and candidate genes associated with branching in 200 F6 recombinant inbred lines derived from a cross between Jiyu69 and SS0404-T5-76, which exhibit significant differences in branch number. Using a high-resolution genetic map constructed using the BARCSoySNP6K chip, we detected a novel QTL and confirmed three known QTLs related to branching, as well as two known QTLs for total pod number. Two of the QTLs conferring branching, including a major QTL on chromosome six with an R 2 value of 14.5%, were co-localized with QTLs associated with total pod number. Although several of the QTLs we identified for the two traits were located near identified QTLs, the high-resolution map enabled us to significantly narrow down the genomic regions for these QTLs (from 26 Mb to 460 kb at most), facilitating identification of promising candidate genes. From the QTL regions we identified, we selected six candidate genes, mostly encoding transcription factors regulating expression of gene networks involved in axillary branching via interactions with the auxin hormone network, including a TEOSINTE-BRANCHED1/CYCLOIDEA/PCF (TCP) transcription factor (BRANCHED1: BRC1) and a homeobox-leucine zipper protein (REVOLUTA: REV). The results of this study will help breeders improve soybean yield by increasing the branch number using marker-assisted selection, and will facilitate identification of the causative genes for branching. |
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