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GrainGenes Reference Report: JFC-48-6074

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Reference	JFC-48-6074
Title	Nutritionally relevant parameters in low-phytate barley (Hordeum vulgare L.) grain mutants
Journal	Journal of Agricultural and Food Chemistry
Year	2000
Volume	48
Pages	6074-6080
Author	Hatzack F Johansen KS Rasmussen SK
Abstract	Summary: Nutritionally relevant parameters in barley low-phytate mutant grains were analyzed in order to assess the potential value of these lines for future feeding trials. Phytate (myo-inositol 1,2,3,4,5,6-hexakisphosphate) levels in grains from A- and B-type low-phytate mutants corresponded to 25% and 66% of those of the parent line content, respectively. These relative decreases in phytate were accompanied by proportional increases of inorganic phosphate amounts. Apart from phytate, A-type grains also contained substantial quantities of myo-inositol 1,3,4,5-tetrakisphosphate. Phytate levels in straw and root material from mutants were similar to parent line controls, indicating that low-phytate mutations were grain specific. Analysis of K, Mg, Ca, and Zn revealed normal or slightly increased mineral cation levels in grains from all low-phytate lines, suggesting that mutationally impaired phytate accumulation did not affect mineral storage capacity. Other nutritionally important parameters such as starch and protein contents were similar to parent line controls. Finally, dynamic changes in the phosphorus composition during kernel development suggested that A-type mutations directly affected phytate synthesis, whereas B-type mutations seemed to act on regulation of synthesis
Keyword	[ Hide all but 1 of 22 ] barley calcium corn elements hordeum vulgare magnesium mineral cations mutant mutation phosphate phosphorus phytase phytate potassium protein content regulation root soybean seeds starch storage washington zinc

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