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QTL analysis for plant height and fine mapping of two environmentally stable QTLs with major effects in soybean
TIAN Yu, YANG Lei, LU Hong-feng, ZHANG Bo, LI Yan-fei, LIU Chen, GE Tian-li, LIU Yu-lin, HAN Jia-nan, LI Ying-hui, QIU Li-juan
2022, 21 (4): 933-946.   DOI: 10.1016/S2095-3119(21)63693-6
Abstract241)      PDF in ScienceDirect      
Plant height is an important agronomic trait, which is governed by multiple genes with major or minor effects.  Of numerous QTLs for plant height reported in soybean, most are in large genomic regions, which results in a still unknown molecular mechanism for plant height.  Increasing the density of molecular markers in genetic maps will significantly improve the efficiency and accuracy of QTL mapping.  This study constructed a high-density genetic map using 4 011 recombination bin markers developed from whole genome re-sequencing of 241 recombinant inbred lines (RILs) and their bi-parents, Zhonghuang 13 (ZH) and Zhongpin 03-5373 (ZP).  The total genetic distance of this bin map was 3 139.15 cM, with an average interval of 0.78 cM between adjacent bin markers.  Comparative genomic analysis indicated that this genetic map showed a high collinearity with the soybean reference genome.  Based on this bin map, nine QTLs for plant height were detected across six environments, including three novel loci (qPH-b_11, qPH-b_17 and qPH-b_18).  Of them, two environmentally stable QTLs qPH-b_13 and qPH-b_19-1 played a major role in plant height, which explained 10.56–32.7% of the phenotypic variance.  They were fine-mapped to 440.12 and 237.06 kb region, covering 54 and 28 annotated genes, respectively.  Via the function of homologous genes in Arabidopsis and expression analysis, two genes of them were preferentially predicted as candidate genes for further study.
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Development and identification of glyphosate-tolerant transgenic soybean via direct selection with glyphosate
GUO Bing-fu, HONG Hui-long, HAN Jia-nan, ZHANG Li-juan, LIU Zhang-xiong, GUO Yong, QIU Li-juan
2020, 19 (5): 1186-1196.   DOI: 10.1016/S2095-3119(19)62747-4
Abstract178)      PDF in ScienceDirect      
Glyphosate-tolerant soybean is the most widely planted genetically modified crop worldwide.   However, soybean remains recalcitrant to routine transformation because of the low infection efficiency of Agrobacterium to soybean and lack of useful selectable markers.  In this study, several Agrobacterium strains and cell densities were compared by transient expression of the GUS gene.  The results showed that Agrobacterium strain Ag10 at cell densities of OD600 of 0.6–0.9 yielded the highest infection efficiency in Agrobacterium-mediated soybean cotyledonary node transformation system.  Meanwhile, a simple and rapid method was developed for identification of glyphosate tolerance in putative T0 transgenic plants, consisting of spotting plantlets with 1 µL Roundup®.  The whole cycle of genetic transformation could be shortened to about 3 mon by highly efficient selection with glyphosate during the transformation process and application of the spot assay in putative T0 transgenic plantlets.  The transformation frequency ranged from 2.9 to 5.6%.  This study provides an improved protocol for development and identification of glyphosate-tolerant transgenic soybeans.
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