The yellowing of leaves and fruits is a frequently observed effect of ethylene. The biochemistry of chlorosis is regulated by many factors and is reversible (W0084934). Other hormones such as IAA, gibberellic acid, and cytokinins, and treatments such as darkness, decapitation, and jasmonic acid can influence chlorophyll levels. In addition, under steady-state conditions, there is a constant turnover of chlorophyll. Although chlorosis is a commonly observed process, its biochemistry remains a mystery. Each year billions of tons of chlorophyll disappear from senescing plants without our understanding of how the process is accomplished (HEN87255). Ethylene-enhanced chlorophyll degradation is of commercial interest. In green vegetables workers try to prevent chlorophyll loss, while in fruits they encourage it. Most of the research on ethylene-chlorophyll relationships has dealt with the ability of ethylene to induce catabolism. However, it has also been shown that ethylene can regulate chlorophyll synthesis. 
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