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. 1997 Sep;9(9):1547–1557. doi: 10.1105/tpc.9.9.1547

Light-Dependent Spatial and Temporal Expression of Pigment Regulatory Genes in Developing Maize Seeds.

A Procissi 1, S Dolfini 1, A Ronchi 1, C Tonelli 1
PMCID: PMC157032  PMID: 12237395

Abstract

Both light and developmental stimuli are directly involved in the regulation of plant gene expression. In maize, activation of the anthocyanin pathway represents an excellent model system for studying the interactions between an external factor, such as light, and internal factors that regulate plant and seed development. By analyzing in detail the aleurone and pericarp seed layers, different developmental windows for light have been found in the two tissues[mdash]the former in the advanced stages of development and the latter in the early stages of seed development. Transcriptional control of the structural genes involved in anthocyanin deposition within the pericarp is known to be exerted by the Sn and pl genes, whereas the aleurone is controlled by the R and C1 regulatory genes. By using in situ hybridization analysis, we detected tissue-specific expression of Sn and R in the seed layers, revealing a correlation between structural gene activation and anthocyanin accumulation. In addition, RNA gel blot analysis revealed that Sn expression is enhanced by light, whereas the R gene expression is not. However, the light-induced expression of the myb-type genes C1 and pl, detected by reverse transcriptase-polymerase chain reaction, was found to be the limiting factor for conferring the developmental competence of the pericarp and the aleurone layers to light responsiveness.

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Selected References

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