
TY  - JOUR
A1  - Kim, J. C. 
A1  - Mullan, B. P. 
A1  - Simmins, P. H. 
A1  - Pluske, J. R. 
T1  - Variation in the chemical composition of wheats grown in Western Australia as influenced by variety, growing region, season, and post-harvest storage
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 2003
VL  - 54
IS  - 6
SP  - 541
EP  - 550
KW  - wheat, growing environment, storage, monogastric animals.
UR  - https://doi.org/10.1071/AR02183 
N2  - 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 &#215; 3 &#215; 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 = &#8211;0.779, P &#60; 0.001). Variety influenced fast digestible starch (P &#60; 0.001), acid detergent fibre (ADF, P &#60; 0.01), total NSP (P &#60; 0.05), insoluble NSP (P &#60; 0.05), and in vitro extract viscosity (P &#60; 0.05). The annual precipitation level (mm) irrespective of growing region was correlated to bushel weight (r = &#8211;0.683, P &#60; 0.01), CP (r = &#8211;0.631, P &#60; 0.01), total starch (r = 0.526, P &#60; 0.05), ADF (r = &#8211;0.687, P &#60; 0.01), lignin (r = &#8211;0.863, P &#60; 0.001), soluble NSP (r = 0.826, P &#60; 0.001), and free sugar contents (r = &#8211;0.795, P &#60; 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 &#60; 0.05 to &#60;0.001) and bushel weight (P &#60; 0.001) of wheat. Storage for 6 months decreased soluble NSP (P &#60; 0.01), ADF (P &#60; 0.05), and lignin content (P &#60; 0.01), and increased free sugar content (P &#60; 0.001). 
ER  -

