Regulation of Storage Protein Synthesis in Cereal Seeds: Developmental and Nutritional Aspects

Autor: Massimo Maddaloni, Søren Knudsen, Philippe Gallusci, Mario Motto, Dirk Schmitz, Mikael Blom Sørensen, Martin Müller, Jost R. Muth, Francesco Salamini, Diter von Wettstein, Richard D. Thompson
Rok vydání: 1995
Předmět:
Zdroj: Journal of Plant Physiology. 145:606-613
ISSN: 0176-1617
DOI: 10.1016/s0176-1617(11)81271-x
Popis: Summary The major seed storage proteins of cereals are deposited in the maturation phase of endosperm development, starting at 12 days after pollination (dap) in maize and continuing up to around 30dap. Cell types-pecific expression in the endosperm is conferred by a multicomponent promoter motif, the endosperm box sequence. Proteins interacting at this motif include the gene product of the regulatory gene Opaque-2 (O2). O2 encodes a b2IP transcription factor, which is capable of activating its target promoters, 22kD α-zein and b-32, in a number of experimental systems. Storage protein accumulation, and storage protein promoter activity, are modulated according to available levels of nitrogen (N). In barley, nitrogen regulation is mediated by the endosperm box via interaction of the endosperm and GCN 4 motifs. The nitrogen- responsive components of the 22kd zein promoter have been shown to include the O2-binding sites Z1–Z3 but to display N-responsiveness even in the absence of O2 protein.
Databáze: OpenAIRE
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