scholarly journals Growing techniques of potato from true seed in Finland

1988 ◽  
Vol 60 (2) ◽  
pp. 101-107
Author(s):  
Seija Ahonen ◽  
Helena Lamminsivu
Keyword(s):  
Solanum Tuberosum ◽  
Solanum Tuberosum L ◽  
Production Methods ◽  
Seed Company ◽  
True Seed ◽  
The Common ◽  
Pan American ◽  
The University ◽  
Sensory Tests ◽  
Better Than

The suitability of three production methods for potato (Solanum tuberosum L.) from true seed (TPS)were studied in field conditions at the University of Helsinki, Department of Horticulture. The production methods were direct field sowing, planting 4-week old seedlings raised in peat pots and planting seedlings and covering them with floating polypropylene mulch. The cultivars were Explorer and Pan American Seed Company varieties numbers 2928 and 4000. Also tested were the cultivars 2909, 2928, 3018, 4000, 4016, 4048 and 4147. Floating mulch promoted vegetative growth, but also promoted the propagation and spreading of Phytophtora infestans spores. The best yield was obtained with pot-raised seedlings without mulching (3.38 kg/m2), the second best yield with mulching (2.69 kg/m2) and the lowest yield with field-sowing (2.33 kg/m2). More small tubers were obtained under floating mulch than without mulching. Of the seven Pan American Seed Company cultivars tested, 4047 and 4016 gave the best yield, 4.1 and 4.0 kg/m2. In sensory tests none of the three cultivars (3018, 4047 and Explorer) proved to be better than or equal to the taste of the common vegetatively propagated Finnish potato variety called Pito.

Triploids of the common potato,Solanum tuberosum L.

1976 ◽  
Vol 19 (4) ◽  
pp. 377-380 ◽  
Author(s):  
N. Van Suchtelen
Keyword(s):  
Solanum Tuberosum ◽  
Solanum Tuberosum L ◽  
Common Potato ◽  
The Common

scholarly journals GENETIC ANALYSIS OF ISOZYME LOCI IN TETRAPLOID POTATOES (SOLANUM TUBEROSUM L.)

Genetics ◽  
1984 ◽  
Vol 108 (3) ◽  
pp. 669-679
Author(s):  
J M Martinez-Zapater ◽  
Jose L Oliver
Keyword(s):  
Solanum Tuberosum ◽  
Genetic Control ◽  
Solanum Tuberosum L ◽  
Duplicate Gene ◽  
Starch Gel Electrophoresis ◽  
Tetrasomic Inheritance ◽  
Isozyme Loci ◽  
Starch Gel ◽  
Common Potato ◽  
The Common

ABSTRACT The genetic control of eight isozyme loci revealed by starch gel electrophoresis was studied through the analysis of three progenies derived from four tetraploid cultivars of Solanum tuberosum (groups Andigena and Tuberosum). Duplicate gene expression was found in seven (Got-A, Got-B, Pgd-C, Pgi-B, Pgm-A, Pgm-B and Pox-C) isozyme loci. In another isozyme gene (Adh-A), the parental genotypes were not adequate to distinguish between a monogenic or a digenic model of genetic control. Tetrasomic inheritance was demonstrated in four (Got-A, Got-B, Pgd-C and Pgi-B) isozyme loci. In the remaining duplicate genes, the parental genotypes precluded discrimination between disomic or tetrasomic models. Tetrasomic segregations of the chromosomal type were generally found; however, the isozyme phenotypes shown by three descendants from selfing cv. Katahdin indicate the occurrence of chromatid segregations, although aneuploidy cannot be ruled out. Either autoploidy or amphidiploidy with lack of chromosome differentiation between the two diploid ancestors can account for the existence of tetrasomic inheritance in the common potato.

Advances in imaging SIMS studies of stained and BrdU-labelled human metaphase chromosomes

1995 ◽  
Vol 53 ◽  
pp. 932-933
Author(s):  
R. Levi-Setti ◽  
J. M. Chabala ◽  
R. Espinosa ◽  
M. M. Le Beau
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Analytical Sensitivity ◽  
Metaphase Chromosomes ◽  
Banding Patterns ◽  
Sector Mass Spectrometer ◽  
Staining Methods ◽  
The University ◽  
Secondary Ion ◽  
Better Than

We have shown previously that isotope-labelled nucleotides in human metaphase chromosomes can be detected and mapped by imaging secondary ion mass spectrometry (SIMS), using the University of Chicago high resolution scanning ion microprobe (UC SIM). These early studies, conducted with BrdU- and 14C-thymidine-labelled chromosomes via detection of the Br and 28CN- (14C14N-> labelcarrying signals, provided some evidence for the condensation of the label into banding patterns along the chromatids (SIMS bands) reminiscent of the well known Q- and G-bands obtained by conventional staining methods for optical microscopy. The potential of this technique has been greatly enhanced by the recent upgrade of the UC SIM, now coupled to a high performance magnetic sector mass spectrometer in lieu of the previous RF quadrupole mass filter. The high transmission of the new spectrometer improves the SIMS analytical sensitivity of the microprobe better than a hundredfold, overcoming most of the previous imaging limitations resulting from low count statistics.

Scanning Secondary Electron Microscopy of Myofibrils Using Transmission Techniques

1975 ◽  
Vol 33 ◽  
pp. 556-557
Author(s):  
M. K. Lamvik
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Carbon Films ◽  
Photographic Recording ◽  
Transmission Electron ◽  
Thin Carbon ◽  
The Common ◽  
Scanning Electron ◽  
Better Than ◽  
Cellular Organelles

When observing small objects such as cellular organelles by scanning electron microscopy, it is often valuable to use the techniques of transmission electron microscopy. The common practice of mounting and coating for SEM may not always be necessary. These possibilities are illustrated using vertebrate skeletal muscle myofibrils.Micrographs for this study were made using a Hitachi HFS-2 scanning electron microscope, with photographic recording usually done at 60 seconds per frame. The instrument was operated at 25 kV, with a specimen chamber vacuum usually better than 10-7 torr. Myofibrils were obtained from rabbit back muscle using the method of Zak et al. To show the component filaments of this contractile organelle, the myofibrils were partially disrupted by agitation in a relaxing medium. A brief centrifugation was done to clear the solution of most of the undisrupted myofibrils before a drop was placed on the grid. Standard 3 mm transmission electron microscope grids covered with thin carbon films were used in this study.

Situación económica y social de la población de San José del Carmen, San Cristóbal de las Casas, Chiapas

2019 ◽  
Vol 12 (4) ◽  
Author(s):  
Pedro Cadena-Iñiguez ◽  
Eileen Salinas-Cruz ◽  
Jesús Martínez-Sánchez ◽  
Mariano Morales-Guerra ◽  
Romualdo Vásquez-Ortiz ◽  
...  
Keyword(s):  
Solanum Tuberosum ◽  
Theobroma Cacao ◽  
Zea Mays L ◽  
Solanum Tuberosum L ◽  
San Jose ◽  
Phaseolus Vulgaris L ◽  
Las Casas ◽  
Vicia Faba L ◽  
Las Mujeres ◽  
Theobroma Cacao L

Objetivo: Establecer una línea base como fundamento para la intervención e inducción de innovaciones a través de escuelas de campo y planes de negocios. Diseño/metodología/aproximación: El estudio se desarrolló en San José del Carmen, San Cristóbal de Las Casas, Chiapas, México. Se elaboró una encuesta como instrumento para recabar en campo información de familias de la localidad con la finalidad de conocer su situación actual. La localidad de trabajo se eligió utilizando como criterio las poblaciones que se encuentran dentro de Cruzada Nacional contra el hambre y en la clasificación de la pobreza extrema Resultados: La localidad de San José del Carmen es considerada como de alta marginación, la población es bilingüe, su principal lengua es el Tzotzil, el nivel de estudios promedio es hasta el tercer año de primaria, las principales actividades productivas son la siembra de maíz (Zea mays L.), frijol (Phaseolus vulgaris L.), papa (Solanum tuberosum L.) y haba (Vicia faba L.) que son utilizadas principalmente para autoconsumo.  No cuentan con agua potable ya que su sistema es a través de la recaudación de agua de lluvia o a través de un jagüey. Sus principales actividades económicas son la albañilería por parte de los hombres, y venta de productos, tales como el pozol (bebida energética a base de maíz y cacao (Theobroma cacao L.), tostadas y algunos vegetales por parte de las mujeres. Las tostadas son producidas en forma artesanal con un proceso de doble nixtamalización y vendida en bolsas de 20 tostadas cada una, a un costo de MX$10.00 en los mercados de San Cristóbal de las Casas, una a dos veces por semana alrededor de 40 bolsas por día de venta. Limitaciones del estudio/implicaciones: La afiliación zapatista de alguno de los pobladores y el hecho de que algunos habitantes no hablen español, fueron factores que limitaron desarrollar al 100% el estudio; sin embargo, se considera que se tienen los elementos necesarios para establecer la línea base de la situación de San José del Carmen. Conclusiones: El diagnóstico servirá como una herramienta para establecer una intervención a través de innovaciones y planes de negocios en la comunidad de estudio. Los pobladores cuentan con herramientas necesarias para obtener nuevos conocimientos que ayuden a un desarrollo de su producción. El idioma no deberá de ser una limitante para ello.

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