Co-Authors:
Tadmor, Y., USDA-Agricultural Research Service, Aberdeen, ID 83210, United States
Tracy, W.F., USDA-Agricultural Research Service, Aberdeen, ID 83210, United States
Yousef, G.G., USDA-Agricultural Research Service, Aberdeen, ID 83210, United States
Juvik, J.A., USDA-Agricultural Research Service, Aberdeen, ID 83210, United States
Raboy, V., USDA-Agricultural Research Service, Aberdeen, ID 83210, United States
Abstract:
Sweet corn (Zea mays L.) kernel sucrose concentration is determined by genetic and physiological factors that affect carbohydrate metabolism during kernel development. Phosphorus homeostasis via phytic acid metabolism may play a role in carbohydrate metabolism. Isolines and isohybrids that were homozygous sugary1 and either homozygous for the wild-type Low phytic acid 1 (Lpa1) allele, or the recessive lpa1-1 allele, were produced. As originally observed in starchy genetic backgrounds, seed phytic acid was greatly reduced and inorganic P greatly increased, both during development and at maturity, in su1:lpa1-1 as compared with su1:Lpa1 grain. This perturbation in kernel P metabolism had little discernable effect on kernel sugar and water-insoluble starch concentrations during development and at maturity. However mature kernel phytoglycogen (soluble starch) concentration was 43% greater in lpa1-1/su1 grain as compared with Lpa1/su1 grain. These results support the conclusion that normal seed phytic acid metabolism plays a relatively minor role in P homeostasis during development. No preference difference between these two su1 types was detected by a trained taste panel. This supports the possibility that the "low phytic acid" trait, of possible value in improving the nutritional quality of staple foods, can be introduced into food corns without having a large affect on their acceptability.
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