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Author Paszkiewicz, Gaël ♦ Gualberto, José M. ♦ Benamar, Abdelilah ♦ Macherel, David ♦ Logan, David C.
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher American Society of Plant Biologists
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Technology ♦ Medicine & health
Abstract Seed germination is a vital developmental transition for production of progeny by sexual reproduction in spermatophytes. Quiescent cells in nondormant dry embryos are reawakened first by imbibition and then by perception of germination triggers. Reanimated tissues enter into a germination program requiring energy for expansion growth. However, germination requires that embryonic tissues develop to support the more energy-demanding processes of cell division and organogenesis of the new seedling. Reactivation of mitochondria to supply the required energy is thus a key process underpinning germination and seedling survival. Using live imaging, we investigated reactivation of mitochondrial bioenergetics and dynamics using as a model. Bioenergetic reactivation, visualized by presence of a membrane potential, is immediate upon rehydration. However, reactivation of mitochondrial dynamics only occurs after transfer to germination conditions. Reactivation of mitochondrial bioenergetics is followed by dramatic reorganization of the chondriome (all mitochondrial in a cell, collectively) involving massive fusion and membrane biogenesis to form a perinuclear tubuloreticular structure enabling mixing of previously discrete mitochondrial DNA nucleoids. The end of germination coincides with fragmentation of the chondriome, doubling of mitochondrial number, and heterogeneous redistribution of nucleoids among the mitochondria, generating a population of mitochondria tailored to seedling growth.
Description Country affiliation: France
Author Affiliation: Paszkiewicz G ( IRHS, Université d'Angers, INRA, AGROCAMPUS-Ouest, SFR 4207 QUASAV, 49071 Beaucouzé cedex, France.); Gualberto JM ( Institut de Biologie Moléculaire des Plantes, CNRS UPR2357, Université de Strasbourg, 67084 Strasbourg, France.); Benamar A ( IRHS, Université d'Angers, INRA, AGROCAMPUS-Ouest, SFR 4207 QUASAV, 49071 Beaucouzé cedex, France.); Macherel D ( IRHS, Université d'Angers, INRA, AGROCAMPUS-Ouest, SFR 4207 QUASAV, 49071 Beaucouzé cedex, France.); Logan DC ( IRHS, Université d'Angers, INRA, AGROCAMPUS-Ouest, SFR 4207 QUASAV, 49071 Beaucouzé cedex, France david.logan@univ-angers.fr.)
ISSN 10404651
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2017-01-01
Publisher Place United States
e-ISSN 1531298X
Journal THE PLANT CELL ONLINE
Volume Number 29
Issue Number 1


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Source: WHO-Global Index Medicus