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To grow old: regulatory role of ethylene and jasmonic acid in senescence

Joonyup Kim, Caren Chang, Mark L. Tucker
Frontiers in plant science 2015 v.6 pp. 20
Arabidopsis, developmental stages, ethylene, flowers, fruits, hormones, jasmonic acid, leaves, microRNA, senescence (aging), transcription factors
Senescence is the final stage in the development of an organ or whole plant. It is a genetically programmed process controlled by both developmental and environmental signals. Age-related processes and signals underlie the onset of senescence in both organs (leaf, flower, and fruit) and the whole plant (monocarpic senescence). Rudimentary to most senescence processes is the plant hormone ethylene. Ethylene is a small two-carbon, gaseous molecule critical to a diverse set of developmental processes including senescence. The role of ethylene in senescence was discovered almost 100 years ago, but the mechanism and processes controlled by ethylene have only recently been deciphered and much of this is through genetic studies in Arabidopsis. The regulatory network of ethylene involves integration of key transcription factors, microRNAs (miRNAs), and other hormones. In this review, we summarize the current understanding of ethylene’s role in senescence, and discuss the interplay of ethylene with jasmonic acid in the regulation of senescence.