We investigated the thrips fauna on wheat and we discovered 15 species. The most numerous was wheat thrips Haplothrips tritici Kurdjumov. In the same time we investigated the thrips fauna on the plants of the spontaneous flora in the bordering belt surrounding wheat. We collected thrips on 23 plants of the spontaneous flora. A total of 649 thrips specimens have been collected and 32 thrips spieces were identified. The most numerous species was the Onion thrips Thrips tabaci Lindeman. For this species low presence was recorded on wheat and grasses, but high presence on the spontaneous plants. The second most numerous species was Aeolothrips intermedius Bagnall. We found the specimens of this species in great number on wheat as well as on the spontaneous plants surrounding it. 14 species were common for wheat and the spontaneous plants. Sorensen's index of faunistic similarity was 0.6.
Authors:L. Radenovic, V. Selakovic, B. Janac and Pavle Andjus
The purpose of this study was to investigate neuroprotective efficiency of N-methyl D-aspartate (NMDA) receptor (NMDAR) blockade on the neuronal damage in the less studied and allegedly less affected CA3 hippocampus and striatum in the Mongolian gerbil model of global cerebral ischemia. The common carotid arteries of gerbils were occluded for 5, 10 or 15 minutes. Gerbils were given a low dose of non-competitive NMDA antagonist (MK-801, 3 mg/kg i.p.) or saline immediately after the occlusion in normothermic conditions. Neuronal damage was examined on 4th, 14th and 28th day after reperfusion. The effect of NMDAR blockade was followed in vivo by monitoring the neurological status of whole animals or at the cellular level by standard light- and confocalmicroscopy on brain slices. Increased duration of cerebral ischemia resulted in a progressive loss of striatal and CA3 hippocampal neurons. The most beneficial NMDAR blockade effect was observed when the neuronal damage was most severe — on the 28th day after 15-min ischemia. As judged by morphological and neurological data, the effect of ischemia is also apparent in the presumed less vulnerable regions (CA3 and striatum) which are functionally important in stroke plasticity. So, NMDAR blockade in normothermic conditions showed neuroprotective efficiency.
Authors:S. Trdan, N. Valič, L. Andjus, I. Vovk, M. Martelanc, B. Simonovska, J. Jerman, R. Vidrih, M. Vidrih and D. Žnidarčič
In a field experiment on the natural resistance of cabbage (
) against onion thrips
, 20 cabbage genotypes were included: 9 early, 5 mid-early, 6 mid-late (regarding the longevity of the growing period), 3 red, 17 white (regarding colour), 14 hybrids and 6 varieties (regarding genetic origin). For comparisons between genotypes, we determined significant differences in the mean index of damage on the exterior leaves of cabbage heads (1.12–2.83), the net weight of heads (281.40,151169.6 g), and yield loss (5.8–47.4%). The concentration of several compounds from cabbage leaves (epicuticular wax, α-amyrin, β-amyrin, lupeol, sucrose, glucose, fructose, vitamin C, palmitic acid, stearic acid, and arachidic acid) are measured. For all groups of cabbage genotypes the only confirmed negative correlation was between the extent of damage caused by the sucking of onion thrips and epicuticular wax content on the cabbage leaves (in groups where we artificially placed genotypes with similar characteristics). After this preliminary experiment, the research must be extended in order to determine the effect of the remaining analysed compounds in cabbage leaves for resistance (sensitivity) of cabbage to onion thrips attack.