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The shade avoidance response is a plant's way of changing its growth pattern when it is being shaded by another plant. Upon to shade, many plants will grow taller, flatten their leaf angle, and extend their leaves further from their stems in order to reac sunlight. Research performed by Pierik et al. Interactions between ethylene and gibberellins in phytochrome- mediated shade avoidance responses in tobacco. 2004. Plant Physiology 136:2928- 36; online at "http://www.plantphysiol.org/cgi/content/full/136/2/2928)" http://www.plantphysiol.org/cgi/content/full/136/2/2928) examined the role of ethylene and gibberellins on the shade avoidance response in tobacco plants. The shade avoidance response is known to involve phytochromes.
-Ethylene's role in the shade avoidance response in tobacco plants is related to its role in fruit ripening, leaf abscission, and senescence.

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Ethylene's role in the shade avoidance response is distinct from its roles in fruit ripening, leaf abscission, and senescence, as it specifically relates to how plants adjust their growth in response to shade, rather than to these other processes.

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