NDLI: Programmed cell death of secretory cavity cells of citrus fruits is associated with Ca2+ accumulation in the nucleus

Content Provider	Springer Nature Link
Author	Zheng, P. Bai, M. Chen, Y. Liu, P. W. Gao, L. Liang, S. J. Wu, H.
Copyright Year	2014
Abstract	An increase in Ca 2+ concentration in the nucleus may activate the PCD of secretory cavity cells, and further Ca 2+ accumulation contributes to the regulation of nuclear DNA degradation. Calcium plays an important role in plant programmed cell death (PCD). Previously, we confirmed that PCD was involved in the degradation of secretory cavity cells in Citrus sinensis (L.) Osbeck fruits. To further explore the function of calcium in the PCD of secretory cavity cells, we used potassium pyroantimonate precipitation to detect and locate calcium dynamics. At the precursor cell stage of the secretory cavity, Ca2+ was only distributed in the cell walls. At the early stage of secretory cavity initial cells, Ca2+ in the cell walls was gradually transported into the cytoplasm via pinocytotic vesicles. Although a small amount of Ca2+ was present in the nucleus, the TUNEL signal was scarcely observed. At the middle stage of initial cells, a large number of pinocytotic vesicles were transferred to the nucleus, where the vesicle membrane fused with the nuclear membrane to release calcium into the nucleoplasm. In addition, abundant Ca2+ aggregated in the condensed chromatin and nucleolus, where the TUNEL signal appeared the strongest. At the late stage of initial cells, the chromatin and nucleolus gradually degraded and disappeared, and the nucleus appeared broken-like, as Ca2+ in the cell wall had nearly completely disappeared, and Ca2+ in the nucleus was also rapidly reduced. Furthermore, the TUNEL signal also disappeared. These phenomena indicated that an increase in Ca2+ concentration in the nucleus might activate the PCD of secretory cavity cells, and further Ca2+ accumulation contributed to the regulation of nuclear DNA degradation.
Starting Page	1137
Ending Page	1144
Page Count	8
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	28
Issue Number	4
e-ISSN	14322285
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-05-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ca2+ Programmed cell death Secretory cavity Citrus sinensis Forestry Plant Sciences Agriculture Plant Anatomy/Development Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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