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Erlangen, Germany

Krenz B.,Lehrstuhl fur Biochemie | Guo T.W.,Cornell University | Kleinow T.,University of Stuttgart
Acta Societatis Botanicorum Poloniae | Year: 2014

Stromules are stroma-filled tubules, extruding from the plastid and surrounded by both envelope membranes, but so far, stromules remain enigmatic structures and their function unknown. Stromules can interconnect plastids and have been found to associate with the nucleus, endoplasmic reticulum, Golgi complex, plasma membrane, mitochondria and peroxisomes. This minireview briefly summarizes markers to visualize stromules, inducers of stromules and provides new data about plant virus induced stromules. Source

Guo T.W.,Cornell University | Vimalesvaran D.,Cornell University | Thompson J.R.,Cornell University | Perry K.L.,Cornell University | Krenz B.,Lehrstuhl fur Biochemie
Virus Genes | Year: 2015

Grapevine red blotch-associated virus is a recently discovered plant monopartite gemini-like virus found in North American grapevines. Leaf discoloration and a decrease in fruit quality are associated with its infection. Two of its six open reading frames (ORFs), V2 and V3, are of unknown function and share no obvious homology with plant or viral genes. Transient expression of these ORFs in fusion with the green fluorescent protein demonstrated that the V2 protein localizes in the nucleoplasm, Cajal bodies, and cytoplasm; and the V3 protein localizes in various unidentified subnuclear bodies. Additionally, the V2 protein is redirected to the nucleolus upon co-expression with the nucleolus and Cajal body-associated protein Fib2. © 2015, Springer Science+Business Media New York. Source

Wyant P.,University of Stuttgart | Strohmeier S.,University of Stuttgart | Fischer A.,University of Stuttgart | Schafer B.,University of Stuttgart | And 3 more authors.
Virus Research | Year: 2015

Asystasia gangetica (. Acanthaceae) from tropical Africa and Asia is used as source of food and for medical applications. Plants collected in West Africa in the 1980s with typical geminivirus symptoms showed an unusual symptom segregation that included vein yellowing, curling and mosaic, which were present simultaneously or separately on different leaves of the same plant or on different plants propagated as cuttings from a single plant. Rolling-circle amplification in combination with restriction fragment length polymorphism analysis followed by deep sequencing of the RCA products identified two geminiviruses in these plants. One with a bipartite genome, Asystasia begomovirus 1, and the other with a monopartite genome together with its defective DNA, Asystasia begomovirus 2. The relationship between leaf symptoms and virus distribution under different light regimes was investigated, and showed for the first time an unusual segregation of symptoms and viruses, either within a single plant, or even within a leaf. © 2014 Elsevier B.V. Source

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