Photosynthesis-Associated Gene Families: Differences in Response to Tissue-Specific and Environmental Factors

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Abstract
The endogenous small subunit of the ribulose-1,5-bisphosphate carboxylase gene rbcS and the light-harvesting chlorophyll a/b-binding protein gene ( LHCP ) of pea are expressed in a light-inducible manner and are active mainly in green chloroplast-containing tissue. Chimeric genes under control of the 5′-flanking sequences of the rbcS ss 3.6 or LHCP AB 80 genes from pea were used to study the factors relating to the tissue-specific and light-inducible expression of these nuclear-encoded genes in transgenic tobacco plants. The results show that plastid development plays a crucial role in the activation of expression of these chimeric genes. Particular members of each of the above gene families respond differently to tissue-specific and environmental factors. Furthermore, the light-inducible expression directed by the 5′-flanking sequence of ss 3.6 rbcS gene is not exclusively mediated by phytochrome, but probably is controlled in large part by another photoreceptor.

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