Variation in the chemical composition of wheats grown in Western Australia as influenced by variety, growing region, season, and post-harvest storage
Kim, J.C., Mullan, B.P., Simmins, P.H. and Pluske, J.R. (2003) Variation in the chemical composition of wheats grown in Western Australia as influenced by variety, growing region, season, and post-harvest storage. Australian Journal of Agricultural Research, 54 (6). pp. 541-550.
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Two experiments were conducted to examine varietal and environmental influences on physical characteristics and chemical content in a cohort of wheats grown in Western Australia. In Expt 1, a 3 x 3 x 2 factorial experiment examined the relationships between wheat variety (Arrino, Stiletto, and Westonia), growing region (high, medium, and low rainfall zone), and 2 harvest years (1999 and 2000). In Expt 2, the effect of storage for 6 months on the chemical composition of the wheats was examined. Wide variations in the content of crude protein (CP, CV 19.4%), total starch (CV 5.45%), total non-starch polysaccharides (NSP, CV 9.4%), insoluble NSP (CV 10.4%), and soluble NSP (CV 20.7%) were observed. The crude protein content of wheat was inversely related to total starch content (r = -0.779, P < 0.001). Variety influenced fast digestible starch (P < 0.001), acid detergent fibre (ADF, P < 0.01), total NSP (P < 0.05), insoluble NSP (P < 0.05), and in vitro extract viscosity (P < 0.05). The annual precipitation level (mm) irrespective of growing region was correlated to bushel weight (r = -0.683, P < 0.01), CP (r = -0.631, P < 0.01), total starch (r = 0.526, P < 0.05), ADF (r = -0.687, P < 0.01), lignin (r = -0.863, P < 0.001), soluble NSP (r = 0.826, P < 0.001), and free sugar contents (r = -0.795, P < 0.001), indicating the importance of annual rainfall for accumulation of protein, carbohydrates, and lignin in wheats. Harvest year had a strong influence on chemical composition (P < 0.05 to <0.001) and bushel weight (P < 0.001) of wheat. Storage for 6 months decreased soluble NSP (P < 0.01), ADF (P < 0.05), and lignin content (P < 0.01), and increased free sugar content (P < 0.001).
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Veterinary and Biomedical Sciences|
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