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Canola oil increases in polyunsaturated fatty acids and decreases in oleic acid in drought‐stressed Mediterranean‐type environments
Author(s) -
Aslam M. N.,
Nelson M. N.,
Kailis S. G.,
Bayliss K. L.,
Speijers J.,
Cowling W. A.
Publication year - 2009
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2008.01577.x
Subject(s) - canola , oleic acid , linoleic acid , biology , brassica , fatty acid , linolenic acid , meal , polyunsaturated fatty acid , agronomy , zoology , growing season , food science , botany , biochemistry
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.