Zur Verträglichkeit von Hafer mit sich selbst und mit anderen Getreidearten     

G. Franke 《Archives of Agronomy and Soil Science》2013,59(6):419-433

  相似文献   

Pigeon Health and Disease     

KA Doyle  HMcL Gordon 《Australian veterinary journal》1993,70(7):278-278

  相似文献   

Crosses Involving W. Rimpau's Triticale     

R. Franke 《Plant Breeding》1991,107(4):303-308

One hundred years after the creation of the first true triticale crosses of Rimpau , several recent cultivars of triticale and rye have been crossed with two of them. Recombinants of the awned type of Rimpau 's triticale (10) with ‘Grado’, ‘Lasko’ and ‘Otello’ exhibited a prolonged vegetative period, a shorter straw, an improved lodging resistance, good yielding capacity and higher disease resistance as compared to ‘Lasko’.  相似文献   

Developing environmental principles, criteria, indicators and norms for potato production in South Africa through field surveys and modelling     

A.C. Franke  J.M. SteynK.S. Ranger  A.J. Haverkort 《Agricultural Systems》2011,104(4):297-306

The sustainability of agricultural production is linked to the environment from which it draws its resources. Potato production in the Sandveld in the South African Western Cape occurs in the Cape Floral Kingdom: a vulnerable and globally significant biodiversity hotspot. A scientific approach defining and monitoring sustainability criteria and indicators is required to improve the sustainability of potato production in such a sensitive area. In this paper we propose principles related to the ecological impact of potato production (nature preservation, water preservation and the minimization of chemical and carbon-dioxide emissions) and their derived criteria related to land clearing, irrigation, emissions, and others. Next we defined calculable and measurable indicators of the efficiency with which resources are used, such as proportion of land cleared, water use by the crop, amount of biocides used, the embodied energy of biocides, and the energy needed for farming operations versus the potato yields obtained. In-depth interviews were held with 14 farmers representing 20% of the total potato production area to obtain the current values of these indicators. These were compared to model outcomes of two main sustainability indicators: land and water use efficiency. The land use efficiency varied least between growers, from (36 to 58 Mg (tonnes) ha⁻¹), water use efficiency returned values between 3 and 9 g potato l⁻¹ water, while chemical fertilizer phosphorus use efficiency varied most at 98 and 995 g potato g⁻¹ P applied. Model outcomes confirmed some of the trends revealed by the survey, e.g. growing potatoes in winter and growing them with less than optimal water offers possibilities to double water use efficiency. Ways to derive indicator threshold norms are proposed based on the knowledge of physical and biological processes determining resource availability, the observed variation among farmers and the model outcomes. Knowing indicator values, their range and the means to improve resource use efficiency will aid in establishing sustainability norms by providing a quantitative approach to any environmental certification scheme that wishes to licence the delivery of potatoes from the Sandveld.  相似文献   

The chemistry of sexual deception in an orchid-wasp pollination system     

Schiestl FP  Peakall R  Mant JG  Ibarra F  Schulz C  Franke S  Francke W 《Science (New York, N.Y.)》2003,302(5644):437-438

The "sexually deceptive" orchid Chiloglottis trapeziformis attracts males of its pollinator species, the thynnine wasp Neozeleboria cryptoides, by emitting a unique volatile compound, 2-ethyl-5-propylcyclohexan-1,3-dione, which is also produced by female wasps as a male-attracting sex pheromone.  相似文献   

AWARDS OF THE ELLA SACHS PLOTZ FOUNDATION     

Franke KW  Potter VR 《Science (New York, N.Y.)》1936,83(2153):330-332

  相似文献   

Genetische Variabilität     

Joachim Dehne  Kurt Skiebe  Martin Stein  Hagen Herdam  Rolf Franke  Heinz Leike 《Genetic Resources and Crop Evolution》1988,36(1):247-274

Zusammenfassung Für die Pflanzenzüchtung ist die genetische Variabilität eine entscheidende Voraussetzung. Sie basiert auf Genmutationen, Chromosomenmutationen, Introgressionen, Autopolyploidie, Alloplasmie, transponiblen DNA-Elementen und der Kombination. Diese Variabilitätskomponenten werden charakterisiert. Außerdem wird anhand von Beispielen ihr Einfluß auf die Entwicklung der Kulturpflanzen demonstriert.Um effektiv in der Pflanzenzüchtung arbeiten zu können, bedarf es der Analyse von genetischer Variabilität. Dies geschieht mit Hilfe von Kreuzungsexperimenten und Parameterschätzungen. In zunehmendem Maße werden auch Marker bei der Analyse eingesetzt.Einen wichtigen Faktor zur zielgerichteten Beeinflussung der genetischen Variabilität stellt die Selektion dar. Sie führt zur Einschränkung der Kombination. Die Selektion ist für die Entwicklung von Sorten notwendig. Sie hat aber auch eine Verarmung an genetischer Information zur Folge.Für den weiteren Fortschritt in der Pflanzenzüchtung gilt es, eine genügende genetische Variabilität zu gewährleisten. Dazu bedarf es auch Maßnahmen zu ihrer Erhaltung. Genetische Variabilität muß außerdem verstärkt charakterisiert und analysiert werden.

---

Genetic variability

Summary Genetic variability is a decisive prerequisite to plant breeding. It is based on gene mutations, chromosome mutations, introgressions, autopolyploidy, alloplasmy, transposible DNA elements and recombinations. These components of the genetic variability are illustrated and examples are given to demonstrate their contributions to the evolution of crop plants.Effective plant breeding requires the analysis of the genetic variation. It is analysed by hereditary studies and parameter estimations. The utilization of markers is continuously increasing in studies of the genetic variation.Selection is an important factor to a purposive influence on the genetic variability and leads to a restriction of the recombinations. Selection is necessary for the development of varieties but results also in an impoverishment of genetic information.For the continuous progress in plant breeding an adequate genetic variability is to secure. That includes also activities to its conservation. Furthermore the characterization and analysis of the genetic variability has to be intensified.

---

. , , , , , . . , . , , . . . . . . , , . . . .

  相似文献   

4 THE EFFECTS OF EXERCISE AND INJURY ON CHONDROITIN SULFATE AND KERATAN SULFATE CONTENT IN EQUINE SYNOVIAL FLUID.     

MP  Brown  AHK Plaas  JD Sandy  JA Hernandez  KA Merritt  . 《Veterinary surgery : VS》2003,32(6):599-599

  相似文献   

Effects of fluoride, calcium, and phosphorus on porcine bone   总被引：1，自引：0，他引：1  

G R Spencer  F I el-Sayed  G H Kroening  K L Pell  N Shoup  D F Adams  M Franke  J E Alexander 《American journal of veterinary research》1971,32(11):1751-1774

  相似文献   

Determination of Clostridium boltulinum toxins using passive hemagglutination     

F Franke 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1974,21(9):660-676

  相似文献