Hyperhydricity of micropropagated shoots: a typically stress-induced change of physiological state
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 i...
Saved in:
Published in | Plant cell, tissue and organ culture Vol. 77; no. 2; pp. 181 - 191 |
---|---|
Main Authors | , , , , |
Format | Journal Article Web Resource |
Language | English |
Published |
Dordrecht
Springer
01.05.2004
Kluwer Academic Publ |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 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. |
---|---|
Bibliography: | scopus-id:2-s2.0-1842420576 |
ISSN: | 0167-6857 1573-5044 1573-5044 |
DOI: | 10.1023/B:TICU.0000016825.18930.e4 |