** AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** THIS RESEARCH FOCUSES ON UNDERSTANDING AND COMBATING THE THREAT POSED BY WEEDS THAT SIGNIFICANTLY HAMPERS CROP PRODUCTION. THIS WORK USES A WEEDY GRASS,POA ANNUA,AS A MODEL OF STUDY DUE TO ITS GLOBAL DOMINANCE, WIDE RANGE OF PHENOTYPES, AND GENOMIC INSTABILITY. WEEDS LIKEPOA ANNUACAN DRASTICALLY REDUCE AGRICULTURAL YIELDS, IMPACTING FOOD SUPPLY AND ECONOMIC STABILITY. GIVEN THE GROWING GLOBAL POPULATION AND CHANGING CLIMATE, IT IS CRUCIAL TO DEVELOP EFFECTIVE STRATEGIES TO MANAGE THESE WEEDS. THIS PROJECT IS NOT ONLY RELEVANT TO FARMERS BUT ALSO TO THE BROADER COMMUNITY, AS IT AIMS TO ENHANCE FOOD SECURITY, PROMOTE ENVIRONMENTAL SUSTAINABILITY, AND SUPPORT ECONOMIC RESILIENCE.TO TACKLE THIS ISSUE, OUR RESEARCH WILL DELVE INTO THE GENETIC MAKEUP OFPOA ANNUA. BY STUDYING ITS GENOME, WE AIM TO UNDERSTAND HOW IT ADAPTS TO DIFFERENT ENVIRONMENTAL CONDITIONS. OUR APPROACH INVOLVES SEQUENCING THE DNA AND RNA OF VARIOUSPOA ANNUASAMPLES FROM DIVERSE ECOLOGICAL REGIONS SPANNING HOT-DRY MEDITERANEAN CLIMATES AND COOL-WET ALPINE CLIMATES. THIS WILL HELP US IDENTIFY GENETIC VARIATIONS THAT ALLOW THE WEED TO THRIVE IN DIVERSE CLIMATES. ADDITIONALLY, WE WILL DEVELOP A COMPUTATIONAL TOOL TO ANALYZE GENETIC DIFFERENCES BETWEEN THESE SAMPLES, WHICH CAN BE USED FOR STUDYING OTHER SIMILAR ORGANISMS AS WELL.THE ULTIMATE GOAL OF OUR RESEARCH IS TO UNCOVER THE GENETIC FACTORS THAT MAKEPOA ANNUAA SUCCESSFUL AND ADAPTABLE WEED. BY UNDERSTANDING THESE FACTORS, WE CAN DEVISE NEW, SCIENCE-BASED STRATEGIES TO MANAGE AND CONTROL THIS WEED MORE EFFECTIVELY. THIS WILL NOT ONLY HELP FARMERS INCREASE CROP YIELDS BUT ALSO REDUCE THE ENVIRONMENTAL IMPACT OF WEED MANAGEMENT PRACTICES. THE INSIGHTS GAINED FROM THIS STUDY WILL BE SHARED WITH THE SCIENTIFIC COMMUNITY TO INFORM FUTURE AGRICULTURAL PRACTICES, ENSURING A MORE SUSTAINABLE AND RESILIENT FOOD PRODUCTION SYSTEM.