The “Nanguo” pear is a typically climacteric fruit and ethylene is the main factor controlling the ripening process of climacteric fruit. Ethylene biosynthesis has been studied clearly and ACC synthase (ACS) is the rate-limited enzyme. ACO (ACC oxidase) is another important enzyme in ethylene biosynthesis. By exploring the pear genome, we identified 13 ACS genes and 11 ACO genes, respectively, and their expression patterns in fruit and other organs were investigated. Among these genes, 11 ACS and 8ACO genes were expressed in pear fruits. What’s more, 4 ACS and 3ACO genes could be induced by Ethephon and inhibited by 1-MCP treatment. This study is the first time to explore ACS and ACO genes at genome-wide level and will provide new data for research on pear fruit ripening.

“南果”梨是典型的更年期水果，乙烯是控制更年期水果成熟过程的主要因素。乙烯的生物合成已被清楚地研究，ACC合酶（ACS）是限速酶。ACO（ACC氧化酶）是乙烯生物合成中的另一种重要酶。通过探索梨基因组，我们分别鉴定了13个ACS基因和11个ACO基因，并研究了它们在水果和其他器官中的表达模式。在这些基因中，有11个ACS和8个ACO基因在梨果实中表达。此外，乙烯利可以诱导4个ACS基因和3个ACO基因，而1-MCP处理则可以抑制它们。这项研究是第一次探索全基因组水平的ACS和ACO基因将为梨果实成熟的研究提供新数据。