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.
Upper and lower epidermal cell morphology of lettuce Caesar Green (A,B) and Polla (C,D), cell length and width, ratio of cell length to width, and ratio of the upper and lower epidermal cell lengths of lettuce Caesar Green (E–H) and Polla (I–L) as affected by the lighting direction. Vertical bars indicate the means ± stand error (n = 3). Different small letters indicate the significant separation within treatments by the Duncan’s multiple range test at p ≤ 0.05. Bars indicate 20 μm.
