El uso del cloruro 2, 3, 5-trifeniltetrazolium para determinar la vitalidad del polen
[EN] Tetrazolium salt solutions, 2,3,5-Triphenyltetrazolium chloride has been employed by several workers in many problems involving differences in tissue viability for both animal and plant tissues, e. g. for testing the germinating ability of seeds, especially cereals; for determining freezing inj...
| Autor: | |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 1952 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/61542 |
| Acceso en línea: | http://hdl.handle.net/10261/61542 |
| Access Level: | acceso abierto |
| Palabra clave: | Tetrazolium Pollen viability Vitalidad del polen |
| Sumario: | [EN] Tetrazolium salt solutions, 2,3,5-Triphenyltetrazolium chloride has been employed by several workers in many problems involving differences in tissue viability for both animal and plant tissues, e. g. for testing the germinating ability of seeds, especially cereals; for determining freezing injury in plants during the growing period at the field and for estimating damage in artificially cured peanuts, as well as for testing viability in bacteria and yeast. But we know of no reference regarding use of Tetrazolium Salt solutions to test pollen viability. In practical work it is very important to know whether pollen is living or not before using it in genetic work. In the present work have reported 0,5, 1,0 and 2,0% Tetrazolium Salt solutions were employed to test viability of maize pollen grains, a positive reaction being obtained with all three solutions. With such concentrations insoluble red triphenyl formazan occurred at 5, 6 and 8 minutes respectively when temperature was at 20º C and pH 7,0. To make the test, fresh pollen grains were placed on a slide, and Tetrazolium Salt solutions added before putting on a cover slip. With the lowest concentrations solutions many pollen grains burst; this did not occur however when a 2,0% solution was employed. So all tests to determine the speed of reduction of the Tetrazolium Salt have been made using this concentration at temperatures 20, 30, 40, 50, 60, 70 and 80ºC. The highest speed occurred at 50º C which appears to be the optimum temperature for Tetrazolium reduction by pollen grains. At 50ºC, positive pollen exhibits a uniform red colour over the whole surface. At 60 and 70º C the colour with positive pollen is a pale rose, occupying only a small part of the surface. It is evident that enzyme systems are responsible for this reduction since it does not occur when pollen grain subjected to enzyme inhibitor treatment; e. g. cooling to OºC or heating to 80ºC or higher. Red triphenyl formazan occurs only with living pollen grains. Dead pollen grains produce no red colour. It seems that Tetrazolium Salt solutions provide a quick reliable index for pollen viability, especially those of Graminaceae type. It is recommended that the test be made at 50ºC, using a 2% solution. |
|---|