ORBi: Kevers Claire - Hyperhydricity of micropropagated shoots: a typically stress-induced change of physiological state

Reference : Hyperhydricity of micropropagated shoots: a typically stress-induced change of physiolog...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Microbiology Life sciences : Phytobiology (plant sciences, forestry, mycology...) Life sciences : Biotechnology
	To cite this reference:	http://hdl.handle.net/2268/3079

Title :	Hyperhydricity of micropropagated shoots: a typically stress-induced change of physiological state
Language :	English
Author, co-author :	Kevers, Claire [Université de Liège - ULg > Département des sciences de la vie > Biologie moléculaire et biotechnologie végétales >]
	Franck, Thierry [Université de Liège - ULg > Département clinique des animaux de compagnie et des équidés > Anesthésiologie gén. et pathologie chirurg. des grds animaux >]
	Strasser, Reto [Université de Genève - UNIGE > > Laboratoire de Bioénergétique > >]
	Dommes, Jacques [Université de Liège - ULg > Département des sciences de la vie > Biologie moléculaire et biotechnologie végétales >]
	Gaspar, Thomas [> > Botanique, radiobotanique & serres expér. >]
Publication date :	May-2004
Journal title :	Plant Cell, Tissue & Organ Culture
Publisher :	Kluwer Academic Publ
Volume :	77
Issue/season :	2
Pages :	181-191
Audience :	International
ISSN :	0167-6857
City :	Dordrecht
Keywords :	[en] hyperhydricity ; JKB-trilogy ; micropropagation
	[fr] state change ; stress concept
Abstract :	[en] Hyperhydricity of micropropagated shoots, formerly called vitrification, undoubtedly results from growth and culture conditions, subjectively reputated as stressing factors: wounding, infiltration of soft culture medium, generally of a high ionic strength, rich in nitrogen and in growth regulators in a special balance, in a humid and gaseous confined atmosphere. Stress is (objectively) defined as a disruption of homeostasis resulting from a constraint escaping the usual flexibility of metabolism. It induces another temporary (reversible) or definitive (irreversible) thermodynamic physiological state. The state-change concept developed by Strasser (1988) and Strasser and Tsimilli-Michael (2001) is applicable to the phenomenon of hyperhydricity. An appraisal of the redox capacities of hyperhydrated shoots together with a study of some enzymic activities that catalyse pentose phosphate and glycolytic pathways has indeed shown that such shoots have evolved towards a temporary state of lower differentiation or a juvenile state with a sufficient activity to survive and to defend themselves.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/3079

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