2012 Annual Report 1a.Objectives (from AD-416): 1: To determine the ethylene biosynthetic capacity of the tomato plant. [NP 301, C 4, PS 4A] 2: To determine some of the molecular details of the regulation of the tomato genes by the hormone auxin. [NP 301, C 4, PS 4A] 1b.Approach (from AD-416): Ethylene is a unique plant signaling molecule. The hydrocarbon gas, known as the fruit ripening hormone, controls many aspects of plant growth and development, and its synthesis is highly regulated. Recent experimental evidence indicates that the key enzyme in the ethylene biosynthetic pathway,1-aminocyclopropane-1-carboxylic acid (ACC) synthase (ACS) is encoded by a highly divergent multigene family in various mono and dicotyledonous plants. The members of each family are differentially regulated by various inducers and developmental stages. Studies on the heterodimerization properties of the various ACS isozymes are proposed in order to determine the biochemical capacity of the ACC gene family. Functional intermolecular complementation and biomolecular fluorescence complementation (BiFC) experiments will be carried to achieve this objective. Furthermore, molecular experiments are proposed to determine which of the Auxin Response Factor (ARF) gene family members regulates the various ACS genes in tomato. 3.Progress Report: The SY retired and a new SY will be hired this coming fall. A new research project will be written at that time. Funds were used to pay the salary of research scientist in the Vegetable and Forage Crops Research Laboratory in Prosser, Washington. A portion of the remaining funds were placed into our specific cooperative agreement for start-up funds for the new hire that we hope to attract during FY2013. The start-up funds will pay for travel, buying equipment, supplies and hiring people.