Increased Chromosomal Variation in Transgenic versus Nontransgenic Barley (Hordeum vulgare L.) Plants

By H. Choi, P. Lemaux, M. Cho. 2000

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Recent advances in genetic transformation of forage and turf grasses (2006, background): “It is well known that callus induction and plant regeneration from the induced callus is not only time-consuming and laborious, but also causes somaclonal variation (Spangenberg et al., 1998; Choi et al., 2000; Goldman et al., 2004).”
Comparative study on vegetative, reproductive and qualitative traits of seven diploid and tetraploid watermelon lines (2005, background): “Similar phenotypic variations, such as larger plant organs in polyploid compared with diploid plants, were reported in plants of alfalfa and potato (Lee & Phillips, 1988) and barley (Choi et al., 2000).”
Efficient in vitro plant regeneration from shoot apices and gene transfer by particle bombardment in Jatropha curcas (2010, background): “Transgenic plants regenerated through more or less long-term callus phase have an increased risk of somaclonal variation, problems in transgene inheritance and stability of expression (Choi et al. 2000, Bregitzer and Tonks 2003).”