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Key message Complete differentiation of the first earlywood vessels occurred earlier in upper regions of stems than in middle and lower regions when buds swelling in a ring-porous hardwood Quercus serrata seedlings. Abstract In deciduous ring-porous hardwoods, the timing of the onset of conduction of water via the networks of the current year’s earlywood vessels is very important for the growth...
Key messageA better understanding of the influence of environmental conditions on wood formation should help to improve the radial growth of trees and to prepare for climate change. Abstract The cambial activity of trees is associated with seasonal cycles of activity and dormancy in temperate zones. The timing of cambial reactivation in early spring and dormancy in autumn plays an important role...
Key messageChanges in cellular contents of ray parenchyma cells during the formation of reaction zone differ between earlywood and latewood in the sapwood ofCryptomeria japonica. Abstract Changes over time in the cellular contents of xylem parenchyma cells provide important clues to the mechanism of the early events in the wound reaction of trees. In this study, we monitored the events that occur...
Key messageCalli of hybrid poplar that had been exposed to desiccation in air before transfer to the induction medium differentiated into tracheary elements at higher rates than calli without air desiccation. Abstract Cells of hybrid poplar (Populus sieboldii x P. grandidentata) in culture can be induced to differentiate into secondary xylem-like tracheary elements that form the highly developed...
Key messageWe observed the formation of latewood tracheids with narrow diameters and thick walls and the disappearance of stored starch around the cambium on the locally heated region of stems in evergreen coniferChamaecyparis pisiferaduring winter cambial dormancy. Abstract Wood formation is controlled by...
Key messageWe found tracheary elements that were induced in suspension cultures of cells derived from young needles of the coniferCryptomeria japonica after cells had been transferred to solidified medium. Abstract The formation of tracheary elements was induced in suspension cultures of cells derived from young needles of the conifer Cryptomeria japonica, 7 days after the cells had been...
Differences in the timing of cell death, differentiation and function among three different types of ray parenchyma cells in the hardwood Populus sieboldii × P. grandidentata which form uniseriate and homocellular rays were examined and clarified. Ray parenchyma cells died within 5 years, and the disappearance of nuclei from ray parenchyma cells did not occur successively from the pith side, even...
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