DISAPPEARANCE OF MICROTUBULES, NUCLEI AND STARCH DURING CELL DEATH OF RAY PARENCHYMA IN ABIES SACHALINENSIS
DISAPPEARANCE OF MICROTUBULES, NUCLEI AND STARCH DURING CELL DEATH OF RAY PARENCHYMA IN ABIES SACHALINENSIS
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DOI：
10.1163/22941932-00000012
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发表时间：
2013-01-01
期刊：
影响因子：
1.9
通讯作者：
Funada, Ryo
中科院分区：
文献类型：
--
作者：
Nakaba, Satoshi;Sano, Yuzou;Funada, Ryo
形态学变化和单个细胞器消失的时间为理解细胞死亡机制提供了关键信息。研究了长寿命针叶冷杉射线薄壁细胞死亡过程中微管、细胞核和淀粉粒的消失。从形成层开始的第8 ~ 10年轮，射线薄壁细胞形态发生变化，细胞器消失。细胞核的形态变化首先显现。然后微管消失，最后细胞核消失。因此，微管可能在射线薄壁细胞死亡过程中起重要作用。淀粉粒消失的时间在射线薄壁细胞中存在差异。这一结果表明，射线薄壁细胞储存功能丧失的时间可能并不取决于细胞死亡的进程。讨论了微管在长寿命射线薄壁细胞死亡过程中可能起的不同于短寿命射线管细胞死亡的作用。
Morphological changes and the timing of disappearance of individual organelles provide key information for understanding the mechanism of cell death. The disappearance of microtubules, nuclei and starch grains was monitored during the death of long-lived ray parenchyma cells in the conifer Abies sachalinensis. From the eighth to the tenth annual ring from the cambium, morphological changes occurred in ray parenchyma cells and organelles disappeared. Morphological changes in nuclei became apparent first. Then microtubules disappeared and, finally, nuclei disappeared. Therefore, microtubules might play an important role during the death of ray parenchyma cells. The timing of the disappearance of starch grains differed among individual ray parenchyma cells. This result indicates that the timing of the loss of storage function in ray parenchyma cells might not depend on the progress of cell death. The possible role of microtubules during cell death of long-lived ray parenchyma cells that might differ from cell death of short-lived ray tracheids is discussed.