Temporally and spatially controlled death of parenchyma cells is involved in heartwood formation in pith regions of branches of Robinia pseudoacacia var. inermis
Temporally and spatially controlled death of parenchyma cells is involved in heartwood formation in pith regions of branches of Robinia pseudoacacia var. inermis
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DOI：
10.1007/s10086-011-1221-y
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发表时间：
2012-02-01
影响因子：
2.9
通讯作者：
Funada, Ryo
中科院分区：
文献类型：
--
作者：
Nakaba, Satoshi;Yamagishi, Yusuke;Funada, Ryo
重点研究刺槐分枝髓部周围的四种薄壁组织细胞。 inermis，我们研究了心材形成过程中细胞死亡的时间和作用。位于髓内部的大薄壁细胞在一年内死亡。相比之下，其他实质细胞在 4 年内死亡，细胞死亡时间取决于细胞类型。靠近髓部的木质部轴向薄壁细胞首先死亡。然后，髓部外部髓周区的小薄壁细胞死亡。最后，木质部靠近髓部的射线薄壁细胞死亡。首先在木质部射线薄壁组织细胞和髓周区的小薄壁组织细胞中观察到细胞壁自发荧光的变化，这可能是由于心材物质的沉积所致。我们的结果表明，刺槐枝条的髓部区域在 4 年内开始形成心材。无刺。此外，似乎不仅木质部射线薄壁细胞，而且髓周区的小薄壁细胞也可能参与心材物质的合成。
Focussing on four types of parenchyma cell around pith regions of branches of Robinia pseudoacacia L. var. inermis, we examined the timing and role of cell death during heartwood formation. Large parenchyma cells that were located in the inner part of the pith died within a year. By contrast, other parenchyma cells died within 4 years, with the timing of cell death depending on the type of cell. Axial parenchyma cells of the xylem close to the pith died first. Then, small parenchyma cells died in the perimedullary zone in the outer part of the pith. Finally, ray parenchyma cells in the xylem close to the pith died. Variations in the autofluorescence of cell walls, which might have been due to deposition of heartwood substances, were observed first in xylem ray parenchyma cells and small parenchyma cells in the perimedullary zone. Our results indicate that the initiation of heartwood formation occurs within 4 years in pith regions of branches in Robinia pseudoacacia L. var. inermis. Moreover, it appears that not only xylem ray parenchyma cells but also small parenchyma cells in the perimedullary zone might be involved in the synthesis of heartwood substances.