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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Fig. 5 | Journal of Wood Science

Fig. 5

From: Relationship between formation of earlywood vessels and leaf phenology in two ring-porous hardwoods, Quercus serrata and Robinia pseudoacacia, in early spring

Fig. 5

Light micrographs showing transverse and radial images of differentiating vessel elements in R. pseudoacacia. On 16th April, deposition of secondary walls in the first earlywood vessels was observed at the top of the stem (a) and 6 m above the ground (c). Radial images revealed perforations (no end walls) at the top of the stem (b), but end walls of earlywood vessels (arrows) were still visible 6 m above the ground (d). On 20th April, deposition of secondary walls in the first earlywood vessels was observed 6 m above the ground (e) and near the ground (g). Radial images revealed perforations 6 m above the ground (f) and partial perforation of vessels near the ground (h). Some end walls of earlywood vessels (arrows) were visible near the ground (h). On 24 April, deposition of secondary walls in earlywood vessels was observed (i) and perforations were observed near the ground (j). Bars 100 µm (a, b, d, f, g) and 200 µm (c, e, g–j)

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