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Scientific article
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English

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

Published inPlant cell, tissue and organ culture, vol. 77, no. 2, p. 181-191
Publication date2004-05
Abstract

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.

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Keywords
  • Hyperhydricity
  • JKB-trilogy
  • Micropropagation
  • State change
  • Stress concept
Citation (ISO format)
KEVERS, Claire et al. Hyperhydricity of micropropagated shoots: a typically stress-induced change of physiological state. In: Plant cell, tissue and organ culture, 2004, vol. 77, n° 2, p. 181–191. doi: 10.1023/B:TICU.0000016825.18930.e4
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ISSN of the journal0167-6857
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