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.
ABA-induced stomatal closure in ferns. A and B, Stomatal aperture of P. proliferum (A) and N. exaltata (B) in the control (0–20 min) and 50 μm ABA (20–120 min) treatment. Blank (control) stomatal aperture measurements were also conducted for 120 min in both species. Data are mean ± se (n = 30–40 stomata from five biological replicates).
