Maize regulatory system

Fig. 1. The maize seedling system. Left The putative regulatory sites for movement of lAA from endosperm to shoot. Right A photograph showing partially dissected seedlings...

ILLUSTRATIONS OF THE MODE OF OPERATION OF A REGULATORY SYSTEM IN MAIZE... 

Within each species, individual promoters resulted in distinct, tissue-dependent accumulation patterns. The cauliflower mosaic virus (CaMV) 35S promoter, for example, led to high-level accumulation in callus and leaves whereas the maize ubiqui-tin-1 promoter was the best choice for producing recombinant proteins in cereal seeds even though it is not in itself seed-specific [23]. The lack of such comparative studies for proteins other than rAbs makes it difficult to generalize an optimal expression strategy for all proteins. Tables 7.1 and 7.2 list recombinant proteins expressed in plants and provide details of the production system, promoters and other regulatory elements used in each case. 

Bradley, J.M. et al.. Variation in the ability of the maize Lc regulatory gene to upregulate flavonoid biosynthesis in heterologous systems. Plant Scl, 140, 37, 1999. 

It is likely that the regulatory mechanisms discussed in Section 5 apply to the regulation of CO2 fixation in C4 plants. In particular it is known that the ferre-doxin/thioredoxin system of light-linked enzyme activation (see Section 5.2.2) is present in C4 plants. NADP-malate dehydrogenase, FBPase and SBPase from maize leaves are regulated in this way [33]. 

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