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

Article Article scientifique Article Hyperhydricity of micropropagated shoots: a typically stress-induced change of physiological state eng 2004-05 author Kevers Claire author Franck Thierry 50111 author Strasser Reto 25398 author Dommes Jacques author Gaspar Thomas 25316 181-191 10.1023/B:TICU.0000016825.18930.e4 0167-6857 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. Hyperhydricity JKB-trilogy Micropropagation State change Stress concept Dewey 580 45 Département des sciences végétales 163 false Plant cell, tissue and organ culture 77 2 ff255cf0-83de-4411-b06d-d94f87173328 Article (Published version) Public Kevers_PCTOC_200477181.pdf 465440 application/pdf OA NATIONAL 3d1e9836d08c5e429f0d9c7289b315390fff0b832a4de3d36588077990a88211 openAccess Faculté des sciences / Section de biologie / Département des sciences végétales

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Hyperhydricity of micropropagated shoots: a typically stress-induced change of physiological state	Plant cell, tissue and organ culture			2004	112	477

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