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United States Department of Agriculture

Agricultural Research Service

Title: Mixograph: How Effective Is It for Wheat Breeding Program?

Authors
item Chung, Okkyung
item Ohm, Jae-Bom
item Caley, Margo
item Seabourn, Bradford

Submitted to: Cereal Foods World
Publication Type: Abstract Only
Publication Acceptance Date: July 17, 2000
Publication Date: November 5, 2000
Citation: Chung, O.K., Ohm, J., Caley, M.S., Seabourn, B.W. 2000. Mixograph: how effective is it for wheat breeding program?. Cereal Foods World. Abstract No. 114 in: 2000 AACC Annual Meeting Program Book. p.219. Meeting Abstract.

Interpretive Summary: To be presented at the 2000 American Association of Cereal Chemists (AACC) Annual Meeting, November 5-9, 2000, in Kansas City, MO.

Technical Abstract: Due to insufficient quantity of early generation samples in wheat breeding programs, hard winter wheat experimental lines (F4-6) are evaluated by a mixograph rather than by experimental breadmaking. The three primary data obtained from a mixogram are optimum mix time (MT), water absorption (WA), and mixing tolerance (TOL) of a given flour. We have made a critical review of mixograph parameters in relation to breadmaking (pup straight dough procedure) parameters using 1706 experimental lines. There were highly significant correlations between mixograph and bake parameters for MT (r=0.848) and for WA (r=0.526). Bake WA can be estimated better from mixo WA if flour protein content and TOL scores are given (r=0.619). Mixograph TOL scores were linearly correlated with bake MT (r=0.697), bread crumb grain scores (r=0.271), LV potential (r=0.241), and bake WA (r=0.186, P<0.0001). Mixograph TOL scores ranged from 0 (unsatisfactory) to 5 (outstanding) with 4 being satisfactory. Bake parameters were compared between samples with different TOL scores: those (N=23) having 0 TOL showed significantly shortest MT, the lowest WA, the smallest LV and LV potential and the worst crumb grain scores, followed by those (N=120) having 1 TOL and those (N=225) having 2 TOL. In conclusion, it is justifiable to discard lines with low TOL scores from breeding lines, and a mixograph is a suitable instrument for early generation screening purposes.

Last Modified: 7/31/2014
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