Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Ethylene triple response of etiolated soybean seedlings. Plants were germinated for 6 d in complete darkness in sealed vessels containing air or air supplemented with ethylene to the concentrations noted. The typical triple response to ethylene includes shortening of the hypocotyl, radial thickening of the central hypocotyl, and excessive curling of the hypocotyl hook.
