Cryopreservation of Plant Cell Lines Using Alginate Encapsulation.

Plant cell cultures consist of single cells or cell clusters growing as callus or suspension. Such cell cultures may be able to produce secondary metabolites and/or possess embryogenic potential. Therefore, they can be used for very different purposes in research, biotechnological applications, as well as for plant propagation.

ATP Content and Cell Viability as Indicators for Cryostress Across the Diversity of Life.

In many natural environments, organisms get exposed to low temperature and/or to strong temperature shifts. Also, standard preservation protocols for live cells or tissues involve ultradeep freezing in or above liquid nitrogen (-196°C or -150°C, respectively). To which extent these conditions cause cold- or cryostress has rarely been investigated systematically.

Cryopreservation of plant cell lines.

Plant cell cultures may consist of dedifferentiated cells as well as of cells showing embryogenic potential. They can be used for very different purposes in research and biotechnology as well as for plant propagation. For such cell cultures, cryopreservation is the only means for long-term preservation.

Impact of pr-10a overexpression on the cryopreservation success of Solanum tuberosum suspension cultures.

Although many genes are supposed to be a part of plant cell tolerance mechanisms against osmotic or salt stress, their influence on tolerance towards stress during cryopreservation procedures has rarely been investigated. For instance, the overexpression of the pathogenesis-related gene 10a (pr-10a) leads to improved osmotic tolerance in a transgenic cell culture of Solanum tuberosum cv. Désirée.

Over-expression of PR-10a leads to increased salt and osmotic tolerance in potato cell cultures.

The PR-10a protein (formerly STH-2) is known to be induced by biotic stress in potato. The present study demonstrates that transgenic suspension cells of the potato cultivar Desiree over-expressing the PR-10a protein exhibit significantly increased salt and osmotic tolerance compared to the respective wild type cells. A comparison of the proteome pattern of Solanum tuberosum suspension cultures cv.

Dicistronic binary vector system-A versatile tool for gene expression studies in cell cultures and plants.

Dicistronic binary vector constructs based on pGreenII vectors for Agrobacterium mediated gene transfer alleviate the translational expression monitoring of a target gene in plants. The functionality of the transformation vectors was proven by marker gene constructs containing a mannopine synthase promoter (p-MAS) fused to a beta-glucuronidase (gus) gene followed by an internal ribosome entry site and a firefly luciferase (luc) gene. The cap-dependent translation of a physically independent target protein can be monitored by the cap-independently co-translated luciferase, because both mRNAs are located on the same strand.