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Biomass and Quercetin Accumulation Predict Drought Sensitivity in a Novel White Clover Hybrid
Wouter L. Ballizany, Rainer W. Hofmann, Brent A. Barrett. Lincoln University / AgResearch / PGG Wrightson Seeds
This study shows for the first time that drought resistance in a new white clover hybrid can be linked to drought-induced increases in quercetin levels, and quercetin-to-kaempferol ratio levels. Subsequent DNA-marker analysis studies will be used to identify quantitative trait loci (QTL) for improved drought resistance in white clover to combine high Q response with high herbage yield.
Collaboration key to developing world genomics research
. PLoS Medicine
Information exchange and knowledge transfer are key to harnessing genomics research for developing countries, write Josefina Coloma and Eva Harris in a PLoS Medicine essay.
Effects of host plant and temperature on Aphidius colemani (Hymenoptera: Braconidae) intrinsic rate of population increase
Rostislav Zemek, Vojtech Jarosik, Jan Havelka and Fernando P. Chihale. Biology Centre of Academy of Sciences of the Czech Republic, Institute of Entomology, Ceske Budejovice, Czech Republic; Charles University, Faculty of Natural Sciences, Prague, Czech Republic
The aim of this paper was to investigate the aphid-mediated effects of plant (Nicotiana tabacum or Vicia faba ) on A. colemani life-history characteristics. The obtained results corroborated our hypothesis that the host plant is important factor in an aphid-parasitoid relationship. Plant toxins are probably the cause of lower rate of population increase in A. colemani developed on tobacco-reared aphids.
Perspectives on the biological control of Cameraria ohridella
Rostislav Zemek, Eva Prenerova, Lubomir Volter, Frantisek Weyda and Vaclav Skuhravy. Biology Centre of Academy of Sciences of the Czech Republic, Institute of Entomology, Ceske Budejovice, Czech Republic; Laboratory of Plant Protection, Olesna, Czech Republic
We studied the impact of parasitoids on C. ohridella in the Czech Republic and also searched for entomopathogenic fungi associated with this pest. The results showed that the rate of parasitism was 5-15%. The most abundant parasitoid species were Minotetrastichus frontalis, Pnigalio sp. and Pediobius saulius. Using the Galleria-bait method we isolated many strains of entomopathogenic fungi. Dominant species were Paecilomyces fumosoroseus, Paecilomyces farinosus and Beauveria bassiana.
Low-cost wind tunnel for micro-arthropods
Rostislav Zemek and Frantisek Reindl. Biology Centre of Academy of Sciences of the Czech Republic, Institute of Entomology, Ceske Budejovice, Czech Republic
Here we describe a construction of wind tunnel suitable for close-up observation of micro-arthropods behavior under various conditions. The tunnel was made of glass with inner dimensions 6x6x110 centimeters. Both the inlet and outlet compartments were equipped with an electric fan, series of plastic diffusers and a metal mesh to minimize wind turbulence inside a 40 centimeters-long observation chamber in the middle of the tunnel.
The first record of Beauveria bassiana (Deuteromycetes) on the hibernating pupae of Cameraria ohridella (Lepidoptera: Gracillariidae)
Eva Prenerová, Rostislav Zemek, František Weyda. Plant Protection Laboratory Olešná, Olešná 87, Bernartice u Milevska, Czech Republic; Institute of Entomology, Biology Centre AS CR, Branišovská 31, Ceské Budejovice, Czech Republic
Samples of the horse chestnut leaves with C. ohridella pupae were collected in autumn at Ceske Budejovice. The leaves were dissected and the pupae were individually placed into the 23°C and 95% R.H. Development of mycosis was frequently observed but only a few pupae were infected by B. bassiana. The strains of the fungus were isolated from individual pupae and deposited in Culture Collection of Entomopathogenic Fungi Olesna.
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