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Isolation of soybean plants with stable transgene expression by visual selection based on green fluorescent protein

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Abstract

Particle bombardment is a common platform for soybean transformation but tends to cause transgene silencing due to the integration of rearranged or multiple copies of transgenes. We now describe the isolation of a total of 44 independent transgenic soybean plants after transformation by particle bombardment with one of two gene constructs, pHV and pHVS. Both constructs contain the hygromycin phosphotransferase gene (hpt) as a selectable marker and a modified glycinin gene (V3-1) for evaluation of homology-dependent silencing of endogenous glycinin genes; pHVS also contains sGFP(S65T), which encodes a modified form of green fluorescent protein (GFP), as a reporter gene in the flanking region of V3-1. Fluorescence microscopy revealed that the leaves of 8 of the 25 independent transgenic plants obtained with pHVS expressed GFP; most of these GFP-positive plants also contained V3-1 mRNA and an increased glycinin content in their seeds, and they exhibited simple banding patterns on Southern blots that were indicative of a low copy number of each of the three transgenes. In contrast, most of the transgenic plants obtained with pHVS that did not express GFP, as well as most of those obtained with pHV, lacked endogenous glycinin in their seeds and exhibited more complex patterns of transgene integration. The use of a reporter gene such as sGFP(S65T) in addition to an antibiotic resistance gene may thus help to reduce the problem of gene silencing associated with direct DNA transformation systems and facilitate the recovery of transgenic plants that stably express the gene of interest.

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El-Shemy, H.A., Teraishi, M., Khalafalla, M.M. et al. Isolation of soybean plants with stable transgene expression by visual selection based on green fluorescent protein. Molecular Breeding 14, 227–238 (2004). https://doi.org/10.1023/B:MOLB.0000047772.48746.f4

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