Seed-specific over-expression of an Arabidopsis cDNA encoding a diacylgylcerol acyltransferase enhances seed oil content and seed weight

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1104/pp.126.2.861
Author	Search for: Jako, Colette¹; Search for: Kumar, Arvind¹; Search for: Wei, Yangdou¹; Search for: Zou, Jitao¹; Search for: Barton, Dennis L.¹; Search for: Giblin, E. Michael¹; Search for: Covello, Patrick S.¹; Search for: Taylor, David¹
Affiliation	National Research Council Canada. NRC Plant Biotechnology Institute
Format	Text, Article
Abstract	We recently reported the cloning and characterization of an Arabidopsis (ecotype Columbia) diacylglycerol acyltransferase cDNA (Zou et al., 1999) and found that in Arabidopsis mutant line AS11, an ethyl methanesulfonate-induced mutation at a locus on chromosome II designated as Tag1 consists of a 147-bp insertion in the DNA, which results in a repeat of the 81-bp exon 2 in the Tag1 cDNA. This insertion mutation is correlated with an altered seed fatty acid composition, reduced diacylglycerol acyltransferase (DGAT; EC 2.3.1.20) activity, reduced seed triacylglycerol content, and delayed seed development in the AS11 mutant. The effect of the insertion mutation on microsomal acyl-coenzyme A-dependent DGAT is examined with respect to DGAT activity and its substrate specificity in the AS11 mutant relative to wild type. We demonstrate that transformation of mutant AS11 with a single copy of the wild-type Tag1 DGAT cDNA can complement the fatty acid and reduced oil phenotype of mutant AS11. More importantly, we show for the first time that seed-specific over-expression of the DGAT cDNA in wild-type Arabidopsis enhances oil deposition and average seed weight, which are correlated with DGAT transcript levels. The DGAT activity in developing seed of transgenic lines was enhanced by 10% to 70%. Thus, the current study confirms the important role of DGAT in regulating the quantity of seed triacylglycerols and the sink size in developing seeds.
Publication date	2001-06
Publisher	Oxford Academic American Society of Plant Biologists
In	Plant Physiology 126, no. 2 (1 June 2001): 861–874.
Language	English
Peer reviewed	Yes
NPARC number	13053718
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Record identifier	eefab379-f076-4319-85c2-592b2ca727d6
Record created	2009-11-25
Record modified	2023-04-14

Date modified:: 2026-01-22