dahlia pinnata/nikotin

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Dahlia mosaic virus and Tobacco streak virus in Dahlia (Dahlia variabilis) in New Zealand.

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Dahlia (Dahlia variabilis Hort.) is a significant ornamental plant in New Zealand. Symptoms such as mosaic, ring spots, mottling, and veinal chlorosis, suggestive of a viral infection, are often seen in various dahlia collections. To better understand the incidence of viruses in dahlia in New

Tobacco streak virus (strain dahlia) suppresses post-transcriptional gene silencing of flavone synthase II in black dahlia cultivars and causes a drastic flower color change.

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CONCLUSIONS Tobacco streak virus suppressed post-transcriptional gene silencing and caused a flower color change in black dahlias, which supported the role of cyanidin-based anthocyanins for black flower appearance. Black flower color of dahlia (Dahlia variabilis) has been attributed, in part, to

[Morphological features of transgenic tobacco plants expressing the AINTEGUMENTA gene of rape under control of the Dahlia mosaic virus promoter].

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Transgenic tobacco plants expressing the AINTEGUMENTA gene of rape under control of the 35S promoter and the promoter of dahlia mosaic virus were obtained. The transgenic plants were characterized by increase in the length of the leaves, flower sizes, stem height, and weight of seeds; at the same

First Report of Tobacco streak virus on Dahlia in the Czech Republic.

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Dahlia is an important ornamental crop in the Czech Republic where they have been grown for more than 150 years. New dahlia cultivars have been selected by Czech plant breeders. Virus diseases, including mosaic and stunt caused mostly by Dahlia mosaic virus, have been a problem. From 2003 to 2005,

First Report of Erwinia amylovora on Firethorn (Pyracantha coccinea) and Mountainash (Sorbus sp.) in Turkey.

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Fire blight, caused by the bacterium Erwinia amylovora, is a serious disease of apples (Malus spp.) and pears (Pyrus spp.) but can also infect many ornamental species in the Rosaceae family. In the summers of 2009 and 2010, leaf and shoot blight and reddish colored cankers were observed on firethorn

First Record of Bacterial Blight Caused by Pseudomonas syringae pv. syringae on Pyracantha coccinea and an Amelanchier sp. in Bulgaria.

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During the spring and summer months of 2004 and 2005, sporadic damage on individual shrubs of Pyracantha coccinea and an Amelanchier sp. were observed at two locations in the region of Plovdiv, Bulgaria. Symptoms initially were expressed as blossom blight and subsequently expanded to the shoots and

First Report of Fire Blight Caused by Erwinia amylovora on Pyracantha coccinea in Bulgaria.

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During late May and June of 2003, a fire blight epidemic occurred in southcentral Bulgaria on earlier reported hosts such as apple, pear, quince, and hawthorn (1). A new host was found when fire blight was also observed in mid-June on Pyracantha coccinea grown in the Plovdiv Region. Symptoms were

Characterization and comparative analysis of promoters from three plant pararetroviruses associated with Dahlia (Dahlia variabilis).

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Two distinct caulimoviruses, Dahlia mosaic virus (DMV) and Dahlia common mosaic virus (DCMV), and an endogenous plant pararetroviral sequence (DvEPRS, formerly known as DMV-D10) were reported from dahlia (Dahlia spp). Promoter elements from these dahlia-associated pararetroviruses were identified

[Characteristics of infection of plants and their cultured tissue with cyanobacterial-bacterial symbiotic associations].

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The infection of tobacco, nightshade, rice plants, and their tissue cultures with the cyanobacteria-bacteria symbiotic associations (CBSA) isolated from natural syncyanoses (the ferns Azolla pinnata and Azolla sp. and the cycad Encephalartos ferox) was studied. The inoculation of the intact plants

Evaluation of indigenous plant extracts against larvae of Culex quinquefasciatus Say (Diptera: Culicidae).

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This study investigates the larvicidal potential of indigenous plant extracts from commonly used medicinal herbs as an environmentally safe measure to control the filarial vector, Culex quinquefasciatus Say (Diptera: Culicidae). The early fourth-instar larvae of C. quinquefasciatus, reared in the

A simple procedure for the extraction of double-stranded RNA from virus-infected plants.

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A simple procedure for the isolation of double-stranded (ds) RNA from virus-infected plants is described. The method is based on grinding plant tissue in 4% p-aminosalicylic acid and recovery of ds RNA by phenol extraction and precipitation with 30% ethanol. The presence of both negative and

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