Figure 1.

Diversity of stomata across the land plant kingdom. (a) The lycophyte Huperzia prolifera, (b) the fern Nephrolepis exaltata, (c) the herbaceous angiosperm Tradescantia virginiana and (d) the grass (wheat) Triticum aestivum. (e) Images of stomata on a leaf epidermis of Commelina communis showing fully inflated guard cells creating approximately circular open pores (scale bar, 50 µm). (f) Images of fluorescing stomata with guard cells expressing guard cell specific GFP-tags (green fluorescent proteins) on a leaf epidermis of Arabidopsis (scale bar, 25 µm) (S. Casson, University of Sheffield, unpublished). Images (a–d) reprinted with permission from Franks & Farquhar [1] (Copyright © American Society of Plant Biologists), (e) reproduced with permission from Franks et al. [2].