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Expression profiles of genes involved in fatty acid and triacylglycerol syntheses in castor bean (Ricinus communis L.)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry.
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2007 (English)In: Lipids, ISSN 0024-4201, Vol. 42, no 3, 263-274 p.Article in journal (Refereed) Published
Abstract [en]

Castor seed triacylglycerols (TAGs) contain 90% ricinoleate (12-hydroxy-oleate) which has numerous industrial applications. Due to the presence of the toxin ricin and potent allergenic 2S albumins in the seed, it is desirable to produce ricinoleate from temperate oilseeds. To identify regulatory genes or genes for enzymes that may up-regulate multiple activities or entire pathways leading to the ricinoleate and TAG synthesis, we have analyzed expression profiles of 12 castor genes involved in fatty acid and TAG synthesis using quantitative reverse transcription-polymerase chain reaction technology. A collection of castor seeds with well-defined developmental stages and morphologies was used to determine the levels of mRNA, ricinoleate and TAG. The synthesis of ricinoleate and TAG occurred when seeds progressed to stages of cellular endosperm development. Concomitantly, most of the genes increased their expression levels, but showed various temporal expression patterns and different maximum inductions ranging from 4- to 43,000-fold. Clustering analysis of the expression data indicated five gene groups with distinct temporal patterns. We identified genes involved in fatty acid biosynthesis and transport that fell into two related clusters with moderate flat-rise or concave-rise patterns, and others that were highly expressed during seed development that displayed either linear-rise or bell-shaped patterns. Castor diacylglycerol acyltransferase 1 was the only gene having a higher expression level in leaf and a declining pattern during cellular endosperm development. The relationships among gene expression, cellular endosperm development and ricinoleate/TAG accumulation are discussed.

Place, publisher, year, edition, pages
2007. Vol. 42, no 3, 263-274 p.
Keyword [en]
Ricinus communis, Gene transcription, Fatty acid, Triacylglycerol, Ricinoleate, Seed development, Temporal pattern
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-15001DOI: 10.1007/s11745-007-3022-zOAI: oai:DiVA.org:uu-15001DiVA: diva2:42772
Available from: 2008-02-01 Created: 2008-02-01Bibliographically approved

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Turner, Charlotta
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