Location: Sunflower and Plant Biology ResearchTitle: Fatty acid and transcript profiling in developing seeds of three Brassica napus cultivars Author
|Petkova, Mariana - Agricultural University Of Bulgaria|
|Rahman, Mukhlesur - North Dakota State University|
Submitted to: Plant Breeding and Seed Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/30/2016
Publication Date: 8/22/2017
Citation: Petkova, M., Chao, W.S., Cook, L., West, M., Rahman, M., Foley, M.E. 2015. Fatty acid and transcript profiling in developing seeds of three Brassica napus cultivars. Plant Breeding and Seed Science. 72(1):3-32. https://doi.org/10.1515/plass-2015-0029.
DOI: https://doi.org/10.1515/plass-2015-0029 Interpretive Summary: Canola is a relatively new crop in the U.S. with 80% of the acreage in North Dakota. We examined the level of fatty acids during seed development for three cultivars that might be important for the public canola breeding program in at North Dakota State University. The expression of several genes involved in the biosynthesis of oil, fatty acids, and seed proteins for the three cultivars was also determined. Data were subjected to correlation analyses to determine potential associations between gene expression and fatty acid levels across cultivars. Correlation analysis indicated no general trend; rather correlations seem to depend on the genotype.
Technical Abstract: Fatty acid levels and gene expression profiles for selected genes associated with the synthesis of fatty acids (FA), triacylglycerol, and oil body proteins were examined in three oilseed rape (Brassica napus) cultivars that have utility for cultivar development in our spring canola breeding program. The seed oil content of Bronowski, Q2, and Westar was 39.0, 40.1, and 40.6%, respectively at 40 days after flowering (DAF). During the 20 to 40 day period of seed development, cultivars had varying levels of palmitic, stearic, oleic, linoleic, a-linolenic, eicosenoic, and erucic acid. In general, the percentage of each FA was similar among the cultivars during seed development. However, the level of oleic acid was lower and the levels of eicosenoic acid and erucic acid were higher in Bronowski than in Q2 and Westar seeds; linoleic acid also tended to be lower in Bronowski. Gene expression among the cultivars was similar from 10 to 40 DAF. The few exceptions were that expression of KAS1 and SAD were higher in Westar and Q2 than in Bronowski at 25 DAF, SAD was highest in Q2, intermediate in Westar, and lowest in Bronowski at 35 DAF, FAD2 was higher in Q2 than in Bronowski at 35 DAF, FAD3 was higher in Q2 than in Bronowski at 15 DAF and Q2 and Westar at 25 and 30 DAF, and FAE1 was higher in Westar and Q2 than in Bronowski at 30 DAF. Correlation analysis for gene expression against DAF for each genotype supported a common trend in gene expression among the three cultivars with gene expression tending to decrease over time; except for LPAAT, which tended to increase. The correlation between the level of FAs and expression of genes by genotype indicated no general trend; rather correlations seem to depend on the genotype.