Graduate Thesis Or Dissertation
 

Possible associations between three procedures to measure noodle starch quality in winter wheat (Triticum aestivum L.)

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  • Until recently, the viscoamylograph had been the primary method for measuring starch as it relates to noodle quality in wheat. This method requires a large sample of flour and is time consuming. With the introduction of the rapid visco-analyser (RVA) in 1986 and the more recent flour swelling volume procedure, both the time to determine starch quality and the sample size required have been reduced Parents, reciprocal F₂, and backcross generations from a cross involving two white wheat lines were space-planted to study the association among the three procedures for measuring noodle starch quality. Grain protein and hardness and plant height also were measured. Differences among the generations were observed for the viscoamylograph, flour swelling volume, and plant height. Coefficients of variation were low for both flour swelling volume and plant height. A significant positive association was found between the viscoamylograph and the RVA (r=0.61). This indicates that for the populations evaluated in this study the RVA can be used in place of the viscoamylograph to measure starch quality. The RVA values, however, varied greatly between years suggesting a large environmental influence. There was also evidence for a genotype by environment interaction. No maternal effects were noted between reciprocal crosses. Conflicting results were found for the association between the flour swelling volume procedure and the RVA and viscoamylograph. Further experiments are required to clarify the possible association between flour swelling volume and other starch quality tests. Such experiments may have to be delayed until the F₄ or F₅ generations when adequate amounts of flour can be obtained from more genetically uniform lines.
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