Table 1.

Stomatal Spacing

% of Rings That Contained at Least One
Guard Cell (Observed, Predicteda)b
OrganRing 1Ring 2Ring 3
Cotyledon0.5, 42c73, 8380, 98
First leaf0.4, 45c53, 75c100, 99
  • a See Methods for formula.

  • b The first ring consisted of all cells adjacent to the selected stoma. The second ring included all cells in contact with and outside of the first ring, etc. A total of 300 first rings, 100 second rings, and 20 third rings were scored.

  • c What was observed was significantly different from what was predicted (P < 0.05).