Described herein are inventions in the field of genetic engineering of plants, including combinations of polynucleotides encoding LMPs to improve agronomic, horticultural, and quality traits. This invention also relates to the combination of polynucleotides encoding proteins that are related to the presence of seed storage compounds in plants. More specifically, the present invention relates to LMP polynucleotides encoding lipid metabolism proteins (LMP) and the use of these combinations of these sequences, their order and direction in the combination, and the regulatory elements used to control expression and transcript termination in these combinations in transgenic plants. In particular, the invention is directed to methods for manipulating fatty acid-related compounds and for increasing oil and starch levels and altering the fatty acid composition in plants and seeds. The invention further relates to methods of using these novel combinations of polypeptides to stimulate plant growth, and/or root growth and/or to increase yield and/or composition of seed storage compounds.