Monthly Archives: April 2016

Wheat blast – Devastating wheat fungus appears in Asia for first time

Nature      click here 27 April 2016

Scientists race to determine origin of  Bangladesh outbreak, which they warn could spread farther afield.Ewen Callaway

Fields are ablaze in Bangladesh, as farmers struggle to contain Asia’s first outbreak of a fungal disease that periodically devastates crops in South America. Plant pathologists warn that wheat blast could spread to other parts of south and southeast Asia, and are hurrying to trace its origins. After rice, wheat is the second most cultivated grain in Bangladesh, which has a population of 156 million people. More broadly, inhabitants of south Asia grow 135 million tonnes of wheat each year.

Wheat blast is caused by the fungus Magnaporthe oryzae. Since 1985, when scientists discovered it in Brazil’s Paraná state, the disease has raced across South America.

The fungus is better known as a pathogen of rice. But unlike in rice, where M. oryzae attacks the leaves, the fungus strikes the heads of wheat, which are difficult for fungicides to reach. A 2009 outbreak in wheat cost Brazil one-third of that year’s crop. “There are regions in South America where they don’t grow wheat because of the disease,” Valent says. Wheat blast was spotted in Kentucky in 2011, but vigorous surveillance helped to stop it spreading in the United States.

 

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X Jornadas Regionales Sobre Mosquitos- Curso Pre-Jornadas

Este año se realizará como actividad adicional el Curso Pre-Jornadas:

12 al 14 de Septiembre de 2016

“Biología y taxonomía de mosquitos (Diptera: Culicidae) en Argentina”

a cargo del Prof. Gustavo Rossi y con la colaboración de los Dres. Sylvia Fischer, Leonardo Díaz-Nieto y Corina Berón,.

Ver Tercera Circular y costos de inscripción here

Prions in plants

Nature, April 25, 2016     Naturedoi:10.1038/nature.2016.19824

Plant protein behaves like a prion

Molecule that controls flowering time misfolds when expressed in yeast.

A protein in thale cress (Arabidopsis, pictured) behaves like a prion when it is expressed in yeast.

“Prions, the misfolded proteins that are known for causing degenerative illnesses in animals and humans, may have been spotted for the first time in plants.

Researchers led by Susan Lindquist, a biologist at the Whitehead Institute for Biomedical Research in Cambridge, Massachusetts, report that they have found a section of protein in thale cress (Arabidopsis) that behaves like a prion when it is inserted into yeast.

In plants, the protein is called Luminidependens (LD), and it is normally involved in responding to daylight and controlling flowering time. When a part of the LD gene is inserted into yeast, it produces a protein that does not fold up normally, and which spreads this misfolded state to proteins around it in a domino effect that causes aggregates or clumps. Later generations of yeast cells inherit the effect: their versions of the protein also misfold.

This does not mean that plants definitely have prion-like proteins, adds Lindquist — but she thinks that it is likely. “I’d be surprised if they weren’t there,” she says. To prove it, researchers would need to grind up a plant and see whether they could find a protein such as LD in several different folded states, as well as show that any potential prion caused a misfolding cascade when added to a test-tube of protein. Lindquist adds that because she’s not a plant scientist — her focus is on using yeast to investigate prions — she hasn’t tried these experiments. The study is reported on 25 April in the Proceedings of the National Academy of Sciences1.”

 

Concurso para Logotipo de RAFV 2016

La Sociedad Argentina de Fisiología Vegetal, llama a Concurso para elegir un LOGOTIPO XXXI RAFV CORRIENTES 2016

La convocatoria se encuentra abierta hasta el 15 de mayo de 2016, y pueden encontrar más detalles al respecto en :
CONCURSO LOGOTIPO XXXI RAFV
http://facebook.us4.list-manage.com/track/click?u=4c131f3a7fc924dd1246015fc&id=ea62fcb452&e=095551e88f

Día de la Tierra – Mother Earth Day

22 de abril         http://www.un.org/es/events/motherearthday/

El Día de la Madre Tierra coincide con la firma del Acuerdo de París.

“Este año, el Día de la Madre Tierra coincide con la ceremonia de firma del Acuerdo de París sobre el cambio climático, que tendrá lugar en la sede de las Naciones Unidas en Nueva York. El Acuerdo fue aprobado por los 196 Estados partes de la Convención Marco sobre el Cambio Climático en París el 12 de diciembre de 2015. Estos 196  países se comprometieron a trabajar para limitar el aumento de la temperatura global por debajo de los 2 grados centígrados, y dados los graves riesgos, a esforzarse por lograr que sea menos de 1,5 grados centígrados.

Tema 2016: Los árboles para la Tierra

El Día de la Tierra comenzó a celebrarse en los Estados Unidos de América en 1970 y ahora se dirige hacia su 50 aniversario. El Día está organizado por la Earth Day Network Disponible en inglés, cuya misión consiste en ampliar y diversificar el movimiento ambiental en todo el mundo y movilizarlo eficazmente para construir un medio ambiente saludable y sostenible, hacer frente al cambio climático, y proteger la Tierra para las generaciones futuras. El tema de este año tiene el objetivo de plantar 7,8 millones de árboles en los próximos cinco años.

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Cianobacterias y el perro como animal centinela

Cianobacterias y el perro

Jornadas Regionales Sobre Mosquitos

Mar del Plata, 15 y 16 de septiembre – Más información (ver 2da. Circular) en https://fibamdp.wordpress.com/mosquitos-vectores-de-enfermedades/