Soil exploration,nutrient partitioning,and nutrient efficiency of beech and spruce seedlings in a rhizotrone experiment     

Zhenyu Wang  Axel Gttlein  Hermann Rodenkirchen 《植物养料与土壤学杂志》2003,166(3):390-391

  相似文献   

Polyacetylenes from the Apiaceae vegetables carrot, celery, fennel, parsley, and parsnip and their cytotoxic activities     

Zidorn C  Jöhrer K  Ganzera M  Schubert B  Sigmund EM  Mader J  Greil R  Ellmerer EP  Stuppner H 《Journal of agricultural and food chemistry》2005,53(7):2518-2523

A dichloromethane extract of root celery yielded falcarinol, falcarindiol, panaxydiol, and the new polyacetylene 8-O-methylfalcarindiol. The structure of the new compound was established by one- and two-dimensional (1D and 2D) NMR, mass spectrometry, and optical rotation data. Nonpolar extracts of roots and bulbs of carrots, celery, fennel, parsley, and parsnip were investigated for their content of polyacetylenes by high-performance liquid chromatography with diode array detection (HPLC-DAD). All five species contained polyacetylenes, although carrots and fennel only in minor amounts. Additionally, the cytotoxicity of the four polyacetylenes against five different cell lines was evaluated by the annexin V-PI assay. Falcarinol proved to be the most active compound with a pronounced toxicity against acute lymphoblastic leukemia cell line CEM-C7H2, with an IC(50) of 3.5 micromol/L. The possible chemopreventive impact of the presented findings is discussed briefly.  相似文献   

Metabolic profiles of the mycotoxin zearalenone and of the growth promoter zeranol in urine,liver, and muscle of heifers     

Kleinova M  Zöllner P  Kahlbacher H  Hochsteiner W  Lindner W 《Journal of agricultural and food chemistry》2002,50(17):4769-4776

A group of five heifers were fed for 84 days with 2 kg of zearalenone-contaminated oats (1370 microg/kg) resulting in an average daily intake of 2740 microg of zearalenone per animal. In a parallel experiment five heifers were implanted with two 25 mg zeranol pellets, one at the beginning of the study and one after 42 days, and fed with 2 kg of "blank" control oats (79 microg/kg, daily intake = 158 microg). A third group of five animals were also fed with 2 kg of "blank" oats and served as control. Urine samples of all animals were collected every 5-6 days during the whole period of the study. Animals of all three groups were killed 84 days after the beginning of the feeding study. Tissue samples (back, femoral region, liver, and residues of implanted pellets) were taken during post-mortem investigations. The content of zearalenone and zeranol and their metabolites in urine and tissue samples was established by an analytical method combining solid-phase extraction and high-performance liquid chromatography-tandem mass spectrometry. Urinary excretion rates of zeralenone and zeranol were calculated from these results.  相似文献   

Variation for resistance to head blight caused by Fusarium graminearum in wild emmer (Triticum dicoccoides) originating from Israel     

Hermann Buerstmayr  Michael Stierschneider  Barbara Steiner  Marc Lemmens  Michaela Griesser  Eviatar Nevo  Tzion Fahima 《Euphytica》2003,130(1):17-23

Head blight of wheat (FHB, scab) caused by Fusarium spp. has been associated with yield and quality losses in many wheat-growing regions. In tetraploid wheat sources of resistance are scarce. In the search for novel sources of resistance, 151 Triticum dicoccoides genotypes, originating from 16 habitats in Israel and one habitat in Turkey together with several control genotypes, were evaluated for reaction to fungal spread (Type II resistance) in replicated greenhouse experiments. Significant genetic diversity was found among the tested genotypes, the broad sense heritability for Type II FHB resistance was 0.71. Most of the tetraploid accessions were highly susceptible, only a few showed moderate resistance. Among the eight T. dicoccoides lines with the lowest relative infection rates, five originated from the Mt. Gerizim population, and three from the Mt. Hermon population. None of the T. dicoccoides lines reached the level of resistance present in the common wheat cultivar Sumai3. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

QTL analysis of resistance to Fusarium head blight in wheat using a 'Frontana'-derived population   总被引：6，自引：1，他引：6  

M. Mardi    L. Pazouki    H. Delavar    M. B. Kazemi    B. Ghareyazie    B. Steiner    R. Nolz    M. Lemmens    H. Buerstmayr 《Plant Breeding》2006,125(4):313-317

Fusarium head blight (FHB or head scab) has become a major limiting factor for sustainable wheat (Triticum aestivum L.) production around the world. For quantitative trait loci (QTL) analysis of resistance to FHB, F₃ plants and F_{3 : 5} lines, derived from a ‘Frontana’ (moderately resistant)/‘Seri82’ (susceptible) cross, were spray‐inoculated in 2001 and 2002, respectively. Artificial inoculations were carried out under field conditions. Of 273 SSR and AFLP markers, 250 could be mapped and they yielded 42 linkage groups, covering a genetic distance of 1931 cM. QTL analysis was based on the constructed linkage map and area under the disease progress curve (AUDPC). The analyses revealed three consistent QTLs associated with FHB resistance on chromosomes 1BL, 3AL and 7AS explaining 7.9%, 7.7% and 7.6% of the phenotypic variation, respectively, above 2 years. The results confirmed the previously described resistance QTL of ‘Frontana’ on chromosome 3AL. A combination of ‘Frontana’ resistance with ‘Sumai‐3’ resistance may lead to lines with augmented resistance expression.  相似文献   

Present strategies in resistance breeding against scab (Fusarium spp.)     

P. Ruckenbauer  H. Buerstmayr  M. Lemmens 《Euphytica》2001,119(1-2):123-129

  相似文献   

Comparison of conventional eight-point crown projections with LIDAR-based virtual crown projections in a temperate old-growth forest     

Stefan Fleck  Inga Mölder  Mascha Jacob  Tobias Gebauer  Hermann F. Jungkunst  Christoph Leuschner 《Annals of Forest Science》2011,68(7):1173-1185

Introduction   

Sight-based field measurements of tree crown projection area and canopy height are common praxis in forest science but difficult to validate. We quantified their measurement errors based on the virtual representation of an 11-species old-growth forest provided by high-resolution terrestrial LIDAR (light detection and ranging) measurements.  相似文献   

Accurate determination of oosporein in fungal culture broth by differential pulse polarography     

Michelitsch A  Rückert U  Rittmannsberger A  Seger C  Strasser H  Likussar W 《Journal of agricultural and food chemistry》2004,52(6):1423-1426

A simple and accurate differential pulse polarographic method has been developed for the determination of oosporein in the culture broth of the fungus Beauveria brongniartii. This hydroxybenzoquinone derivative is the only major secondary metabolite secreted by this entomopathogenic fungus, which is used as biological pest control agent (BCA) against Melolontha melolontha larvae. It can be found in the host organism as well as in the formulated product. The polarographic behavior of oosporein was examined in various buffer systems over the pH range 3-10. In Britton-Robinson buffer/methanol solution (3:7 v/v, pH 5.5) the differential pulse polarograms exhibited reproducible peaks at E(p) = -0.18 V vs silver/silver chloride/potassium chloride (3 M). Under these conditions, a plot of peak height vs concentration of oosporein was found to be linear over the range 5.9 x 10(-)(7) to 2.5 x 10(-)(5) M (0.18-7.74 microg mL(-)(1); r = 0.9998). The detection limit was calculated to be 54 ng mL(-)(1). To evaluate the concentration of oosporein, the standard addition method was applied. The analysis of oosporein in the culture broth led to a mean value of 524.9 microg mL(-)(1) broth with a relative standard deviation (S(rel)) of +/-2.6%. The proposed polarographic method is accurate, not time-consuming, and it is of low cost because no separation steps are necessary.  相似文献   

Molekulare Regulation von Photosyntheseprozessen     

Hermann Bauwe 《Genetic Resources and Crop Evolution》1990,38(1):39-48

Zusammenfassung Nach einem kurzen historischen Überblick über wesentliche Entdeckungen auf dem Gebiet der Photosyntheseforschung werden Fragen der Regulation der Photosynthese höherer Pflanzen behandelt. Dabei wurden vor allem die an der Ribulose-1,5-biphosphat Carboxylase/Oxygenase angreifenden Regulationsprinzipien berücksichtigt.

---

Molecular regulation of photosynthetic processes

Summary Following a short survey on the history of photosynthesis research some of the main principles of photosynthetic regulation are discussed. Especially, those mechanisms are considered which are involved in the regulation of ribulose-1,5-bisphosphate carboxylase/oxygenase.

---

, . ¶rt; -1,5- / .

---

  相似文献   

Präferenzielle Paarung der Chromosomen autotetraploider Gerste — Mathematisches Modell     

Armin Meister  Hermann Bretschneider 《Genetic Resources and Crop Evolution》1977,25(1):297-311

Zusammenfassung Ein mathematisches Verfahren wird beschrieben, mit dessen Hilfe auf mögliche, durch Translokationen bedingte Paarungspräferenzen der Chromosomen in der Meiose bei Autotetraploiden geschlossen werden kann. Bei Gerste konnte mit Hilfe von einfachen und multiplen Translokationen im duplex-heterozygoten Zustand gezeigt werden, daß die Strukturumbauten offenbar in gewissen Grenzen zu präferenzieller Paarung der an den Translokationen beteiligten Chromosomen führten.

---

Preferential Pairing of the Chromosomes of Autotetraploid Barley — a Mathematical Model

Summary A mathematical method is described which can be used for ascertaining possible effects of translocations on chromosome pairing during meiosis in autotetraploids. Using single and multiple translocations in duplex-heterozygous condition in barley, it has been shown that the structural rearrangements apparently resulted in a certain amount of preferential pairing of the chromosomes involved in the interchanges.

---

.

, , . - , , , .

---

---

Herrn Prof. Dr. Drs. h. c.Hans Stubbe zum 75. Geburtstag gewidmet.  相似文献