FIGURE 2.

A case study of SD and SS. (A) Automatically measured SD of abaxial (red) and adaxial (blue) surfaces. The first leaves from bread wheat (Triticum aestivum) were observed at the four-leaf stage of seedlings. Gray horizontal bars indicate mean values. (B) Automatically measured SS of different species with a series of genome sizes. Besides a scatter plot of length (x-axis) and width (y-axis), the density plots along each axis are shown. “x6_Tr,” “x4_Tr,” “x2_Tr,” “x2_Ae,” and “Br” indicate hexaploid T. aestivum, tetraploid Triticum turgidum, diploid Triticum urartu, diploid Aegilops tauschii and diploid Brachypodium distachyon, respectively. More than a thousand stomata were measured for each species. Abaxial stomata from the former four species and adaxial stomata of Brachypodium were measured because the Brachypodium has rich abaxial prickle hairs that hinder automatic measurements. (C) Local SD and local mean stomatal length of bread wheat (T. aestivum). Data were collected by automatic measurements. Each point represents a single microscopic image with a size of 0.984 mm². Besides a scatter plot of SD (x-axis) and length (y-axis), the box plots along each axis are shown.