Observations on different mildew sources used in apple breeding at Ahrensburg     

Jutta Krüger 《Euphytica》1994,77(1-2):1-6

Fifty-six populations of common bean (Phaseolus vulgaris L.) were grown in Pontevedra (Northwestern Spain) in four different environments in order to study their genetic diversity in 18 agronomical traits. All characters showed significant differences among populations, and most of them had significant genotype-environment interactions. Broad-sense heritability for this pool of characters ranged from 0.87 (seed length) to 0.12 (seed yield). Sixteen populations which deserve special attention because of their breeding value for earliness, yield, pod and seed size have been identified.  相似文献   

Spirocyclic Drimanes from the Marine Fungus Stachybotrys sp. Strain MF347     

Bin Wu  Vanessa Oesker  Jutta Wiese  Susann Malien  Rolf Schmaljohann  Johannes F. Imhoff 《Marine drugs》2014,12(4):1924-1938

A novel spirocyclic drimane coupled by two drimane fragment building blocks 2 and a new drimane 1 were identified in mycelia and culture broth of Stachybotrys sp. MF347. Their structures were established by spectroscopic means. This is the first example of spirocyclic drimane coupled by a spirodihydrobenzofuranlactam unit and a spirodihydroisobenzofuran unit; and the connecting position being N-C instead of an N and N connecting unit. Strain MF347 produced also the known spirocyclic drimanes stachybocin A (12) and stachybocin B (11) featured by two sesquiterpene-spirobenzofuran structural units connected by a lysine residue; the known spirocyclic drimanes chartarlactam O (5); chartarlactam K (6); F1839A (7); stachybotrylactam (8); stachybotramide (9); and 2α-acetoxystachybotrylactam acetate (10); as well as ilicicolin B (13), a known sesquiterpene. The relative configuration of two known spirobenzofuranlactams (3 and 4) was determined. All compounds were subjected to biological activity tests. The spirocyclic drimane 2, 11, and 12, as well as the sesquiterpene 13, exhibited antibacterial activity against the clinically relevant methicillin-resistant Staphylococcus aureus (MRSA).  相似文献   

Identification of a RAPD marker linked to the Vf gene for scab resistance in apples     

Hongyu Yang  Jutta Krüger 《Euphytica》1994,77(1-2):83-87

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Chemical and biological characterization of cinnamic acid derivatives from cell cultures of lavender (Lavandula officinalis) induced by stress and jasmonic acid     

Nitzsche A  Tokalov SV  Gutzeit HO  Ludwig-Müller J 《Journal of agricultural and food chemistry》2004,52(10):2915-2923

Cell cultures of lavender (Lavandula officinalis) were analyzed for the metabolite profile under normal growth conditions and under stress as well as after jasmonic acid treatment. The main compound synthesized was rosmarinic acid, which was also secreted into the culture medium. Different solvent extraction methods at different pH values altered the profile slightly. Anoxic stress induced the synthesis of a cinnamic acid derivative, which was identified as caffeic acid by gas chromatography-mass spectrometry. Caffeic acid was also induced after treatment of the cell cultures with jasmonic acid. Although the antioxidative activity of both compounds, rosmarinic acid and caffeic acid, was confirmed in an assay using 2,2-diphenyl-1-picrylhydrazyl (DPPH), it was demonstrated that both substances have a low cytotoxic potential in vitro using acute myeloid leukemia (HL-60) cells. The potential of the system for finding new bioactive compounds is discussed.  相似文献   

Natural wetland restoration and the use of municipal wastewater     

Silke Velty  Axel Behrendt  Jutta Zeitz 《植物养料与土壤学杂志》2006,169(5):642-650

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Livelihood Strategies and Forest Product Utilisation of Rural Households in Nepal     

Jutta Lax  Margret Köthke 《Small-Scale Forestry》2017,16(4):505-520

Most Nepalese rural households adopt diversified strategies of income generation and use products directly collected from forests. To analyse the influence of livelihood strategy on forest product utilisation, a survey of 336 rural households in lowland Nepal was conducted. Four livelihood strategies were identified by means of a Principal Component Analysis based on income variables, followed by hierarchical cluster analysis. Two livelihood strategies are assigned to on-farm activities and two to off-farm activities. The off-farm based strategies were found to result in higher household incomes. To test for differences across the livelihood strategies, additional socio-demographic variables, physical assets and location information have been analysed using ANOVA. The forest product utilisation behaviour of the households differs significantly between livelihood strategies. The households adopting a subsistence-based strategy collect the most forest products while achieving the lowest total income. However, a general influence of the total household income on the forest utilisation intensity is not confirmed. Households receiving remittances from abroad achieve the highest incomes but still collect forest products. The group of most forest-dependent households is mainly characterised by living near the forest and far from city centres with commodity and labour markets, and by having low education and a young head of household. The households relying mainly on private business income have the lowest forest product utilisation and are characterised by the highest education, proximity to markets and greatest area of agricultural land.  相似文献   

The behavior of lactogenic and steroid hormones in the blood of Awassi ewes in Syria during lactation     

Kaskous S  Grün E  Gottschalk J  Hippel T 《Berliner und Münchener tier?rztliche Wochenschrift》2003,116(3-4):117-123

The concentrations of lactogenic hormones (prolactin--PRL, growth hormone--GH, insulin-like growth factor I--IGF-I) and steroid hormones (progesterone--PG, estradiol--E2) were determined by RIA in the blood plasma of 8 lactating ewes (3 with twins) and compared with that of 3 non-lactating cycling ewes of the same age. All animals live in a flock of 30 Awassi sheep under identical conditions in Syria. The lactation period (192 +/- 25 days) is divided to a suckling period (until day 63) and a hand milking period (2 fold daily) with different levels of milk production (near 2 litres/day in the former, decreasing from 0.8 to 0.1 litre/day in the latter). During the suckling period the concentrations of steroid hormones in the blood plasma are lower, these of lactogenic hormones are higher of lactating than of non-lactating ewes. During the milking period only the concentrations of E2, PRL and IGF-I in the blood plasma of lactating animals are lower than in non-lactating ewes. But, during this time more and more seasonal influences (increasing day length and temperature) overwhelm the influence of lactation on the hormone secretion. Suckling of twins is accompanied with higher levels of E2, PRL and IGF-I in the blood plasma of their mothers than suckling of single lambs. During the lactation period a strong correlation exists between milk yield and the level of GH (r = 0.85) and IGF-I (r = 0.71), a smaller correlations to the level of E2 (r = 0.49) in the blood plasma of the lactating ewes. During the suckling period the milk yield is influenced positively by PRL (r = 0.77) and GH (r = 0.68), but negatively by PG (r = -0.76). During the milking period the milk yield is determined extensively by the level of IGF-I (r = 0.89) in the blood plasma. The concentrations of the analyzed hormones in the blood plasma correlate always positively together.  相似文献   

Molecular biology of avian infectious laryngotracheitis virus     

Fuchs W  Veits J  Helferich D  Granzow H  Teifke JP  Mettenleiter TC 《Veterinary research》2007,38(2):261-279

Infectious laryngotracheitis virus (ILTV) is an alphaherpesvirus that causes an economically important chicken disease, which results in delayed growth, reduced egg production, and also frequently in death of the animals. After acute infection of the upper respiratory tract, the virus can establish latency in the central nervous system, and subsequent reactivations can lead to infection of naive chickens. For prevention of ILT, conventionally attenuated live vaccines are available. However, these vaccine strains are genetically not characterized, and reversions to a virulent phenotype occur. Although molecular analyses of ILTV are hampered by the lack of an optimal cell culture system, the complete nucleotide sequence of the ILTV genome has recently been elucidated, and several ILTV recombinants lacking nonessential, but virulence determining genes have been constructed. Animal trials indicated that genetically engineered stable gene deletion mutants are safe alternatives to the current vaccine strains. Furthermore, since live ILTV vaccines are suitable for fast and inexpensive mass administration, they are promising as vectors for immunogenic proteins of other chicken pathogens. Thus, immunization with ILTV recombinants expressing avian influenza virus hemagglutinin was shown to protect chickens against ILT and fowl plague. Using monospecific antisera and monoclonal antibodies several virion proteins of ILTV have been identified and characterized. Since they include immunogenic envelope glycoproteins, these results can contribute to the improvement of virus diagnostics, and to the development of marker vaccines.  相似文献   

A multicentre placebo‐controlled clinical trial on the efficacy of oral ciclosporin A in the treatment of canine idiopathic sebaceous adenitis in comparison with conventional topical treatment     

Jutta Lortz  Claude Favrot  Lars Mecklenburg  Claudia Nett  Silvia Rüfenacht  Wolfgang Seewald  Monika Linek 《Veterinary dermatology》2010,21(6):593-601

Canine idiopathic sebaceous adenitis (ISA) is an inflammatory reaction of sebaceous glands, potentially resulting in their complete loss. It is considered a T‐cell‐mediated disease, but its precise pathogenesis is still unknown. Topical treatment with oil soaks, humectants and shampoos is effective but laborious. Ciclosporin A (CsA), an immunomodulatory drug, has recently been shown to ameliorate the clinical picture of ISA and to reduce inflammation greatly. It is, however, an expensive treatment option. The objective of this multicentre, partly double‐blinded, randomized controlled study was to evaluate the efficacy of ciclosporin A, either alone or with topical therapy, in comparison to conventional topical treatment alone, as measured by the primary end‐points alopecia and scaling, and multiple histopathological secondary objectives. Thirty‐four dogs with an established diagnosis were treated for 4–6 months and were evaluated before, during and after therapy. Both CsA and topical therapy demonstrated efficacy in this study. Differences between the treatment protocols were marginal. Topical treatment, both alone and in combination with CsA, appeared to reduce scaling more effectively than CsA alone. Both therapies reduced alopecia. There is evidence of a synergistic benefit on both scaling and alopecia, if both treatment options are combined. Inflammation of the sebaceous glands is also best reduced by a combination of both CsA and topical therapy. There is evidence that regeneration of sebaceous glands is best achieved by CsA, either given alone or in combination with topical treatment.  相似文献   

Morphological and biochemical responses of Balanites aegyptiaca to drought stress and recovery are provenance‐dependent     

Galal Khamis  AbdElgawad Hamada  Frank Schaarschmidt  Gerrit T. S. Beemster  Han Asard  Jutta Papenbrock 《Journal of Agronomy and Crop Science》2019,205(5):490-507

Balanites aegyptiaca is a drought‐tolerant tree naturally distributed in Africa and has a high potential for biofuel production and livelihood. To understand the plant tolerance to drought stress, B. aegyptiaca plants collected from five provenances were subjected for 4 weeks to drought stress through different regimes of soil volumetric water content (VWC, i.e. 25% control, 15% as moderate and 5% as a severe drought stress) followed by 2‐week recovery. Morpho‐physiological responses as well as the changes in antioxidant defences under water stress and recovery were investigated. Drought stress significantly reduced plant biomass‐related parameters, stomatal conductance, quantum efficiency and increased leaf temperature. Each provenance showed specific patterns of stress response reactions that were detected in a cluster analysis. The large leaf area and a high level of lipid peroxidation in Cairo provenance increased its sensitivity to severe drought. For provenances El‐Kharga and Yemen, the highest tocopherol contents and the highest catalytic activities of ascorbate peroxidase (SOD), catalase (CAT), glutathione reductase (GR) and dehydroascorbate reductase (DHAR) were recorded. These traits contributed to the high drought tolerance of these two provenances in comparison with the other provenances. All plants recovered from stress and showed specifically increased activity of glutathione‐S‐transferase (GST) as a repair mechanism. Results showed that the drought tolerance level in B. aegyptiaca is provenance‐dependent.  相似文献