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Articles

DEVELOPMENT OF A SUITABLE PROTOCOL TO OVERCOME HYPERHYDRICITY IN APPLE (MALUS SP.) DURING IN VITRO REGENERATION

Article number
839_36
Pages
287 – 291
Language
English
Abstract
The occurrence of hyperhydricity of in vitro cultures of apple (Malus × domestica) contributes a key problem in applying tissue cultures for multiplication of plants as well as using biotechnological approaches.
Hyperhydricity is a physiological malformation affecting TC-regenerated plants.
This deformity is associated with excessive hydration and poor lignification resulting in poor regeneration of new shoots from leaf explants.
Several factors have been implicated for inducing hyperhydricity for instance the type of gelling agent and/or the type and composition of phytohormones (e.g., cytokinins). In order to prevent the development of hyperhydricity in different apple rootstock genotypes (M9/T337 and M26) we experimentally evaluated several culturing regimes and media compositions.
Among these the effect of the type of the gelling agent (agar vs. gelrite) and the type of the cytokinin (TDZ vs.
BAP) were tested.
Shoot regeneration on different media formulations was initiated from leaf segments from in vitro propagated plant material.
We could show after optimising the composition of the regeneration medium that shoots regenerated with a significant lower incidence of hyperhydricity on medium with 22.0 µM BAP and 0.8% agar.

Publication
Authors
M.K. Höhnle, G. Weber
Keywords
Malus × domestica, M9/T337, M26, regeneration, rootstock, tissue culture
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