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Disappearance of Microtubules, Nuclei and Starch During Cell Death of Ray Parenchyma in Abies Sachalinensis

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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.


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