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As an allotetraploid oilcrop,  Brassica napus  contains four duplicated Acyl-CoA:diacylglycerol acyltransferase 1 ( DGAT1 ) genes, which catalyze one of the rate-limiting steps in triacylglycerol (TAG) biosynthesis in plants. While all four  BnDGAT1 s have been expressed functionally in yeast, their expression patterns in different germplasms and tissues and also consequent contribution to seed oil accumulation  in planta  remain to be elucidated. In this study, the coding regions of the four  BnDGAT1s  were expressed in an Arabidopsis  dgat1  mutant. All four BnDGAT1s showed similar effects on oil content and fatty acid composition, a result which is different from that observed in previous studies of their expression in yeast. Expression patterns of  BnDGAT1s  were analyzed in developing seeds of 34  B. napus  inbred lines and in different tissues of 14 lines. Different expression patterns were observed for the four  BnDGAT1 s, which suggests that they express independently or randomly in different germplasm sources. Higher expression of  BnDGAT1s  was correlated with higher seed oil content lines. Tissue-specific analyses showed that the  BnDGAT1 s were expressed in a uniform pattern in different tissues. Our results suggest that it is important to maintain expression of the four  BnDGAT1s  for maximum return on oil content.

BnDGAT1s Function Similarly in Oil Deposition and Are Expressed with Uniform Patterns in Tissues of Brassica napus