Portada: Las infraestructuras para la Universiada, en la recta final
Pág. 3: Opinión: Universiada La FISU llega para pasar revista
Pág. 17: La construcción de las instalaciones de la Universiada entra en la recta final
Pág. 19: Linneo, del latín al supermercado
Pág. 23: ‘Deseando amar’, en el ciclo Maestros del cine: Wong Kar-Wai
Descarga por URL: http://sl.ugr.es/0779
Pág. 13: El campus de Cartuja tendrá al final doble sentido para coches particulares
Un congreso estudiará respuestas a alumnos con necesidades especiales
Pág. 15: Publicidad: «ES LA HORA DE APOSTAR POR EL CONOCIMIENTO» es la hora del compromiso. mecenazgo.ugr.es
Pág. 66: Arranca el VII Festival de Teatro Universitario
Pág. 70: La exposición ‘Momias’ bate récords en el Parque de las Ciencias
Pág. 81: Agenda:
– Conferencias:
‘Gemas: estructura, propiedades
– Teatro:
‘Pier Paolo’
– Cine:
‘Deseando amar’
– Exposiciones:
‘DIE MAUER-EL MURO, 25 años desde su caída’
‘El color de la música’
‘La búsqueda es fría’
‘Un jardín japonés: topografías del vacío’
Descarga por URL: http://sl.ugr.es/0778
Pág. 8: La Junta no destinará dinero para la Universiada de Granada, según el PP
Pág. 45: Triple derrota de los equipos universitarios en Cataluña
Pág. 61: ‘Tigres en el jardín’, de Antonio Carvajal, como fuente de inspiración
Pág. 73: Agenda:
– Conferencias:
‘Granada y la literatura viajera’
– Exposiciones:
‘DIE MAUER-EL MURO, 25 años desde su caída’
‘Cien años de Medicina en España’
‘El color de la música’
‘La búsqueda es fría’
‘Un jardín japonés: topografías del vacío’
‘Poéticas del color y del límite’
DXT Págs. 2-3: El Veleta grita ‘No’ a la violencia machista
Descarga por URL: http://sl.ugr.es/076W
73677 An international team of scientists, coordinated by a researcher from the U. of Granada, has found that seed dormancy (a property that prevents germination under non-favourable conditions) was a feature already present in the first seeds, 360 million years ago.
Seed dormancy is a phenomenon that has intrigued naturalists for decades, since it conditions the dynamics of natural vegetation and agricultural cycles. There are several types of dormancy, and some of them are modulated by environmental conditions in more subtle ways than others.
In an article published in the New Phytologist journal, these scientists have studied the evolution of dormancy in seeds using a unique data group. This included the features of dormancy in more than 14.000 species. It is the result of Carol and Jerry Baskin’s work, the co-authors of this publication, who have been studying latency since the 60s.
The analyses conducted by this team of researchers have established that dormancy is as old as seeds themselves. In other words, the oldest among all seeds already had dormancy. ‘Of all possible types of dormancy, the oldest one already featured very sophisticated adjustments to environmental conditions», according to the coordinator of this project, Rafael Rubio de Casas, a researcher from the Environment Department at the University of Granada, and the only Spaniard involved in this research.
Producing new species
The results of this project indicate that plants without dormancy tend to be less capable of diversification, i.e. to produce new species. «This can be due to the fact that dormancy facilitates that germination only takes place at the optimal moment, in spite of changes in the environment, due either to weather phenomena, or whether due to the fact that the seeds reach a new location after dispersal. This adjustment of the plant cycle to the new environment can reduce the probability of a particular species to become extinct», Rubio de Casas pointed out.
Dormancy does not simply involve that seeds do not germinate when it is too hot or too cold, since under those conditions it is the environment itself which precludes germination. «What dormancy does is make sure that the seeds do not germinate even when conditions are favourable, which precludes germination after a summer storm, or during a few warm days in winter», the U. of Granada researcher added.
However, not all plants have dormant seeds. Actually, many species of plants simply germinate at the moment when their seeds are exposed to favourable conditions. Besides, it appears that plants can acquire and lose the dormancy of their seeds in a relatively fast way as a result of natural selection.
«For instance, in the case of cultivated plants, dormancy is one of the first features that appear to have been lost over the domestication process, and for this reason the date for sowing is such an important parameter in farming», according to Rubio de Casas.
Pág. 3: Opinión: PRODUCCIÓN CIENTÍFICA
Pág. 10: La producción científica ‘resiste’ pese a la caída de la inversión
Nuevo espacio en el PTS para el Instituto de Investigación
El grupo espera la acreditación del Instituto Carlos III de Madrid
Pág. 16: La FISU llega a Granada para pasar revista a la Universiada
Pág. 22: ‘La búsqueda es fría’, fotografías de Pilar Baena
Pág. 23: El flamenco en fotografías en la exposición ‘¿Donde va lo jondo?’
Pág. 38: Los Guerreros de los artistas
Sup. Deportes Pág. 23: El Universidad regresa con una segunda derrota
Descarga por URL: http://sl.ugr.es/076S
