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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Fig. 3 | Journal of Wood Science

Fig. 3

From: Temporally and spatially controlled death of parenchyma cells is involved in heartwood formation in pith regions of branches of Robinia pseudoacacia var. inermis

Fig. 3

Light micrographs of transverse and radial sections, stained with acetocarmine, showing nuclei in parenchyma cells around the center of branches of Robinia pseudoacacia L. var. inermis. a A transverse section from near the apical region of a branch (NA sample). b A radial section from near the apical region of a branch (NA sample). c A transverse section of upper region of tissue with four annual rings in xylem that lacked dark-colored heartwood (LH-1 sample). d A radial section of upper region of tissue with four annual rings in xylem that lacked dark-colored heartwood (LH-1 sample). e A radial section of tissue in upper region of LH-2 sample. f A radial section of tissue in lower region of LH-2 sample. g A transverse section of tissue in LH-3 sample. h A radial section of tissue at the same position as in g. Arrows indicate nuclei. Arrowheads indicate cells without nuclei. The left side of the micrographs corresponds to the outer side of the branch. AP Axial parenchyma cell, P pith, PZ perimedullary zone (with double-headed arrow), RP ray parenchyma cell, V vessel element, Xy xylem. Bars 100 μm

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