Distinct cell-specific expression of homospermidine synthase involved in pyrrolizidine alkaloid biosynthesis in three species of the boraginales.

Plant Physiology
Daniel NiemüllerDietrich Ober

Abstract

Homospermidine synthase (HSS) is the first specific enzyme in pyrrolizidine alkaloid (PA) biosynthesis, a pathway involved in the plant's chemical defense. HSS has been shown to be recruited repeatedly by duplication of a gene involved in primary metabolism. Within the lineage of the Boraginales, only one gene duplication event gave rise to HSS. Here, we demonstrate that the tissue-specific expression of HSS in three boraginaceous species, Heliotropium indicum, Symphytum officinale, and Cynoglossum officinale, is unique with respect to plant organ, tissue, and cell type. Within H. indicum, HSS is expressed exclusively in nonspecialized cells of the lower epidermis of young leaves and shoots. In S. officinale, HSS expression has been detected in the cells of the root endodermis and in leaves directly underneath developing inflorescences. In young roots of C. officinale, HSS is detected only in cells of the endodermis, but in a later developmental stage, additionally in the pericycle. The individual expression patterns are compared with those within the Senecioneae lineage (Asteraceae), where HSS expression is reproducibly found in specific cells of the endodermis and the adjacent cortex parenchyma of the roots. The individual ex...Continue Reading

References

May 1, 1997·Biological Signals·M H ParkY A Joe
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Dec 28, 1999·Proceedings of the National Academy of Sciences of the United States of America·D Ober, T Hartmann
Aug 7, 2003·Trends in Genetics : TIG·Balázs PappLaurence D Hurst
Sep 27, 2005·Current Opinion in Plant Biology·Peter J Facchini, Benoit St-Pierre
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Mar 11, 2008·The Plant Cell·Jun MurataVincenzo De Luca
Sep 13, 2008·PLoS Genetics·Jamie T BridghamJoseph W Thornton
Jun 24, 2009·Phytochemistry·Dietrich Ober, Elisabeth Kaltenegger

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Citations

Mar 17, 2015·Proceedings of the National Academy of Sciences of the United States of America·Simon IrmerDietrich Ober
Apr 4, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mahmoud M ZakariaDietrich Ober

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