Life Sciences Commons^™

Exploration Of Antiviral Effects Of Rna-Dependent Rna Polymerases 3, 4 And 5 In Arabidopsis., Eli R. Kallison, Aleksandra Beric, Blake Meyers

IdeaFest: Interdisciplinary Journal of Creative Works and Research from Cal Poly Humboldt

Small RNAs play a number of vital roles in plants, including viral resistance. A particular class of small RNA that regulates plant defense from pathogens, among other functions, is known as small interfering RNAs (siRNAs). A key player in the biogenesis pathway of siRNAs are RNA-Dependent RNA Polymerases (RDRs). There are six RDR proteins in Arabidopsis thaliana, three of which have well documented roles (RDRs 1, 2 and 6), and three of which have no documented role. Here, we look at the functions of the unstudied RDRs, RDRs 3, 4 and 5, to see whether they affect antiviral resistance.

Plant Health In Private Urban Gardens, Stephan Helfer

Turkish Journal of Botany

Private garden plots present a vast area for growing plants for food or enjoyment. The Royal Botanic Garden Edinburgh provides a plant identification and advisory service to the public. This includes a service to advise on plant health problems, which is not advertised. In the past 17 years a moderate number of individuals made use of this service, with an average of 67 enquiries and some 100 specimens per year. Relevant data from the enquiries were entered into a database and analysed. The majority of enquiries concerned tree problems, followed by ornamental and fruit plant problems. Fungi ranked highest, with …

Coming To Grips With Eradu-Patch Of Lupins, Bill Macleod, Mark Sweetingham

Journal of the Department of Agriculture, Western Australia, Series 4

Investigations by Bill MacLoud and Mark Sweetingham have confirmed that Eradu-patch of lupins is caused by apreviously undescribed fungal pathogen,\.

They have developed strategies to minimise the spread of patches but choices are limited for control in lupin crops

Copper Toxicity In Erwinia Amylovora : An X-Ray Microanalytical Study, N. Hodson, D. C. Sigee

Scanning Microscopy

The effect of Cu²⁺ ions on the growth and elemental composition of the phytopathogenic bacterium Erwinia amylovora was investigated by in vitro culture in nutrient broth supplemented with CuSO₄.

No detectable inhibition in bacterial growth occurred with medium supplemented at 10^-4M Cu (compared to control medium with no added Cu), but partial inhibition occurred at 10^-3M Cu (limiting toxicity) and complete inhibition at 10^-2M Cu.

Under conditions of limiting toxicity, incubation in Cu²⁺ ions leads to a reduction in the general synthesis of cell materials and the formation of abnormally …