Protoplasts of Bacillus megaterium readily reverted to bacillary form in liquid media and when plated in a soft-agar layer onto the surface of appropriate agar media. Three phases of the reversion sequence could be differentiated by phase contrast microscopy: (i) increase in size of the individual protoplasts, (ii) non oriented division of the protoplasts and (iii) outgrowth of the bacillary fo...

Liposomes entrapping fluorescein diacetate were fused with protoplasts of Datura innoxia Mill by employing polyethylene glycol (PEG) as the fusogen. Factors that influence liposome-protoplast fusion were optimized as a function of PEG-concentration and incubation duration, liposome composition and surface charge and liposome:protoplast ratio. Phosphatidylcholine-liposomes were found ideal for t...

Ingunn Ulrich and Wolfgang Ulrich Institut für Genetik. Universität Hohenheim , Garbenstraße 30, D-7000 Stuttgart-Hohenheim , Bundesrepublik Deutschland Z. Naturforsch. 41c, 1052 — 1056 (1986); received July 23, 1986 Flow Cytometry, Plant Protoplasts, Protoplasts Preparation, D N A , D A PI Protoplasts prepared from leaves of various higher plants were stained with the specific DNA fluorochrome...

Heat shock transcription factor A2 (HsfA2) participates in multiple stress responses. To provide new insights into the role of HsfA2 in the heat stress (HS) response, in vivo production and localization of reactive oxygen species (ROS) and mitochondrial dynamics were investigated during the onset of cell death induced by an HS (40 degrees C, 10 min) applied after a 2 d recovery at 24 degrees C ...

A method was developed for the large scale and rapid isolation of intact viable corn root protoplasts. Pure and metabolically active protoplasts were collected using a flotation technique. Vital staining tests, light and electron microscopy, and measurements of basic metabolic processes indicated that the isolated protoplasts were metabolically active, and that the plasmalemma and other organel...

The 3' untranslated region (UTR) of turnip crinkle virus (TCV) RNA is 253 nt long (nt 3798-4050) with a 27 nt hairpin structure near its 3' terminus. In this study, the roles of the 3' UTR in virus accumulation were investigated in protoplasts of Hibiscus cannabinus L. and Arabidopsis thaliana (L.) Heynh. Our results showed that, in Hibiscus protoplasts, the minimal 3' UTR essential for TCV acc...

The microviscosity of the plasmalemma of protoplasts isolated from rose (Rosa hyb. cv. Golden Wave) petals was measured by fluorescence depolarization. The plasmalemma's microviscosity was found to increase in petals which were allowed to age on cut flowers or after isolation as well as in isolated protoplasts aged in an aqueous medium. Increasing the temperature of the cut flowers or the isola...

In this study, mutant forms of Bacillus thuringiensis spp. israelensis (H14) were produced. These mutants were identified when the cells were cultured on chloramphenicol plates and stained with crystal violet. Protoplasts of the mutants were isolated by enzymatic digestion (lysozyme) of the cell walls at the presence of an osmotic stabilizer. The protoplasts were induced to fuse to each other i...

A finely dispersed cell suspension was obtained from embryogenic calli of two genotypes of pearl millet (Pennisetum americanum L. Mil cereal). Protoplasts isolated from both cell suspensions divided and produced globular embryoids and calli. On an agar medium, the embryoids were induced to form albino shoots or albino plantlet- like structures

Ceratodon protoplasts regenerate by polar outgrowth to form cell filaments. The kinetics of regeneration show that some cellular event has to be completed before regeneration can be initiated. The development of the regeneration axis is strongly influenced by light, with axis alignment and axis polarity being fixed independently. We define axis alignment as the relationship of the regeneration ...