Glossary of "Plant Biology (1st ed.)" by Graham et al. (2003)
- A gaseous plant hormone that is involved in fruit ripening, leaf abscission, and other plant processes.
Glossary of "Life (9th ed.)" by Sadava et al. (2011)
- One of the plant growth hormones, the gas H2C=CH2. Involved in fruit ripening and other growth and developmental responses.
- Graham, L. E., Graham, J. M. & Wilcox, L. W. 2003. Plant Biology. -xxxv + 497 pp. Pearson Education, Inc., Upper Saddle River.
- Sadava, D., Hillis, D. M., Heller, H. C. & Berenbaum, M. R. 2011. Life: The Science of Biology, 9th ed. -xliv + 1266 pp. Sinauer Associates, Inc., Sunderland.