transgenic engineering of plants has facilitated a thorough understanding of gene expression, offering the possibility of introducing desirable genes from foreign species into target plants, more specifically, into target tissues or cells. In most cases, the foreign genes are driven by a powerful constitutive promoter, such as the cauliflower mosaic virus 35S (CaMV 35S) (Covey et al. 1981) and its derivatives (Rushton et al. 2002). However, excessive accumulation of heterologous proteins and metabolic…
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