Canola oil increases in polyunsaturated fatty acids and decreases in oleic acid in drought-stressed Mediterranean-type environments |
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| Authors: | M N Aslam M N Nelson S G Kailis K L Bayliss J Speijers and W A Cowling |
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| Institution: | School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009;;Canola Breeders Western Australia Pty Ltd, Locked Bag 888, Como, WA 6952;;Present address: Biological Sciences and Biotechnology, Murdoch University, South Street, Murdoch, WA 6150;;Department of Agriculture and Food Western Australia, 3 Baron-Hay Court, South Perth, WA 6151, Australia;;Corresponding author, E-mail: |
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| Abstract: | Seed fatty acid (FA) composition, oil and protein (meal) was assessed on five canola ( Brassica napus ) varieties in 14 cropping environments in southern Australia, including several low rainfall drought-stressed environments. We modelled the relationship between seed quality attributes and growing season rainfall and temperature using a linear mixed model. Variance components for variety and years within locations were relatively large, but variance components for variety × environment interaction were small or insignificant for most seed quality traits. Mean oleic acid content varied from 57% in 'Surpass 300TT' to 62% in 'ATR-Beacon'. As growing season rainfall decreased from 300 mm (moderate) to 150 mm (severe drought stress), mean oleic acid decreased by 3.8%, linoleic acid increased by 2.0%, linolenic acid increased by 1.7%, and saturated FA decreased by 0.4%. Seed oil (% dry weight) decreased by 3.2% and protein in meal (% dry weight) increased by 3.9% across the same rainfall range. High oleic acid composition was associated with higher rainfall and cooler average minimum and maximum temperatures during the growing season. |
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| Keywords: | oilseed rape rapeseed gas chromatography specialty oil genotype by environment interaction G × E |
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