Spacial Distribution and Morphological Features of Root Sprouts in Niseakasia (Robinia pseudo-acasia L.) Growing under a Coastal Black Pine Forest

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  • 海岸クロマツ林内に生育するニセアカシアの根萌芽の分布とその形態的特徴
  • カイガン クロマツバヤシナイ ニ セイイクスル ニセアカシア ノ コン ホウガ

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Distributions of horizontal roots and root suckers in Robonia pseudo-acasia L, were investigated in a coastal black pine forest and the morphological features of root sucker were observed by microscopic method. Many horizontal roots were creeping about 10 cm below the ground, and root suckers had developed on these horizontal roots. The maximum length of horizontal roots was 60.9m and the averaged elongation rate was assumed to be 1.64m/year. There were 143 indivisuals in the investigated site, and almost all of them had originated from root suckers. Root suckers could be found on every age classes, and ages of root suckers were corresponded with that of horizontal roots. These results suggest that root suckers of R. pseudo-acasia had developed coutinously not under stress conditions but under natural conditions closely following the elongation of horizontal roots. Many vascular traces could be observed in the epidermis of horizontal roots. Every root sucker, developed by cutting treatment, was situated above these vascular traces. Vascular traces were arranged regularly on five orthostichys, indicating that vascular traces would be the mark of secondary laterral roots that had been suppressed under epidermis. In contact with these vascular traces, many meristems could be observed in the epidermis, some of which had leaf primordia-like organs. The morphology of these meristems were similar to that of latent buds in the stem. The root suckers developed under natural conditions had similar morphology but their bascular traces had spread widely from the stele, indicating that there were no suppressed period for their development. These morphological features suggested that root suckers of R, pseudo-acasia had originated from the apical meristems of secondary root which were bedded or differentiated in the horizontal roots.

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