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By influencing the decline in proteins involved in photosynthetic metabolism.

Reference:

Regulation of leaf senescence by cytokinin, sugars, and light. Astrid Wingler, Antje von Schaewen, Richard C. Leegood, Peter J. Lea, and W. Paul Quick. Plant Physiol. (1998) 116: 329-335.

http://www.plantphysiol.org/cgi/content/full/116/1/329

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Q: How does cytokinins delay senescence of leaves?
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