Natural Variability of Metabolites in Maize Grain: Differences Due to Genetic Background

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• 作者：Tracey L. Reynolds ; Margaret A. Nemeth ; Kevin C. Glenn ; William P. Ridley ; and James D. Astwood
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2005
• 出版时间：December 28, 2005
• 年：2005
• 卷：53
• 期：26
• 页码：10061 - 10067
• 全文大小：134K
• 年卷期：v.53,no.26(December 28, 2005)
• ISSN：1520-5118

文摘

Understanding the impact of genetic diversity on crop biochemical composition is a prerequisite tothe interpretation and potential relevance of biochemical differences experimentally observed betweengenotypes. This is particularly important in the context of comparative safety assessments for cropsdeveloped by new technologies such as genetic engineering. To interrogate the natural variability ofbiochemical composition, grain from seven maize hybrids grown at four geographically distinct sitesin Europe was analyzed for levels of proximates (fat, protein, moisture, ash, and carbohydrates),fiber, amino acids, fatty acids, four vitamins, nine minerals, and secondary metabolites. Statisticalevaluation of the compositional data at the p < 0.05 level compared each hybrid against every otherhybrid (head-to-head) for all analytes at each site and then across all sites to understand the factorscontributing to variability. Of the 4935 statistical comparisons made in this study, 40% (1986) werefound to be significant. The magnitude of differences observed, as a percent, ranged between 0.84and 149% when all individual sites and the combined sites were considered. The large number ofstatistically significant differences in the levels of these analytes between seven commercial hybridsemphasizes the importance of genetic background and environment as determinants of thebiochemical composition of maize grain, reflects the inherent natural variability in those analytes acrossa representative sampling of maize hybrids, and provides a baseline of the natural range of thesenutritional and antinutritional components in maize for comparative compositional assessments.Keywords: Maize (Zea mays L.); natural variability; composition; substantial equivalence