The long-term objective is to develop genetics of plant and seed chemistry useful in developing crops with improved end-use quality. The primary crops studied are barley and maize. The primary targeted end-uses are for feeds, foods, and biofuel production. Over the next five years the main focus will continue to be the genetics of plant and seed phosphorus. There are three specific objectives. The first objective will be to identify and characterize genes perturbed in barley low phytic acid mutants. Second, this project will develop a better understanding of the relationship between seed phosphorus and inositol phosphate chemistry, plant performance, and stress tolerance. The third objective is to identify novel crop genotypes conditioning altered plant or seed phosphorus chemistry or related phenotypes that are of end-use value. This includes the development of genetic tools useful in breeding or engineering crops with normal shoot P but altered levels of seed total P, and the development of genetic approaches useful in engineering reduced shoot total P. This last objective involves developing genotypes that are tolerant to reduced plant total P.