NDLI: Characterisation of programmed cell death during aerenchyma formation induced by ethylene or hypoxia in roots of maize(Zea mays L.)

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Planta : Volume 212, Issue 1, December 2000

Characterisation of programmed cell death during aerenchyma formation induced by ethylene or hypoxia in roots of maize(Zea mays L.)

Content Provider	Springer Nature Link
Author	Gunawardena, Arunika H. L. A. N. Pearce, Deborah M. Jackson, Michael B. Hawes, Chris R. Evans, David E.
Copyright Year	2001
Abstract	Aerenchyma is a tissue type characterised by prominent intercellular spaces which enhance flooding tolerance in some plant species by facilitating gas diffusion between roots and the aerial environment. Aerenchyma in maize roots forms by collapse and death of some of the cortical cells in a process that can be promoted by imposing oxygen shortage or by ethylene treatment. Maize roots grown hydroponically in 3% oxygen, 1 μl l−1 ethylene or 21% oxygen (control) were analysed by a combination of light and electron microscopy. Use of in-situ terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling (TUNEL) suggested internucleosomal cleavage of DNA. However, chromatin condensation detectable by electron microscopy was preceded by cytoplasmic changes including plasma membrane invagination and the formation of vesicles, in contrast to mammalian apoptosis in which chromatin condensation is the first detectable event. Later, cellular condensation, condensation of chromatin and the presence of intact organelles surrounded by membrane resembling apoptotic bodies were observed. All these events were complete before cell wall degradation was apparent. Therefore, aerenchyma formation initiated by hypoxia or ethylene appears to be a form of programmed cell death that shows characteristics in part resembling both apoptosis and cytoplasmic cell death in animal cells.
Starting Page	205
Ending Page	214
Page Count	10
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	212
Issue Number	2
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-19
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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