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Researchers identify gene that allows corn to grow in poor conditions
Científicos estadounidenses identifican un gen que permite cultivar maíz en suelos pobres


Gainsville, Florida, USA
March 12, 2013

Approximately 30 percent of the world’s total land is too acidic to support crop production, according to the U.S. Department of Agriculture. However, a solution may lie in a strand of corn that is able to grow successfully in acidic soil, thanks to a genetic variation recently identified with help from the University of Florida Genetics Institute.

Findings published Monday in the journal Proceedings of the National Academy of Sciences show that certain strands of corn growing in acidic tropical and subtropical areas have three copies of a particular gene. The expression of the copies results in an increased tolerance to aluminum — a chemical element toxic to many plants at high levels in acidic soil.

The triplicate gene may ultimately be used to breed or genetically modify plants to adapt to soil containing high levels of aluminum.

“Identifying genes that make plants more tolerant of aluminum is very critical for farmers growing crops where productivity is suboptimal due to acidic soil,” said Matias Kirst, co-author and a member of Genetics Institute.

In plants, tolerance to aluminum is a phenotype — a trait such as growth, physiology and yield. It has been long suspected that multiple gene copies determine certain phenotypes, but this is the first actual proof, said Kirst, an assistant professor in UF’s College of Agricultural and Life Sciences.

“This is the first time copy number variation has been shown to affect a phenotype in plants,” Kirst said. “From now on, people will be paying more attention to this type of variation to identify and explain traits.”

The findings suggest that the changes in gene copy number may be a rapid evolutionary response to new environments or climate change. The fact that genome changes are still happening today, after the domestication of maize, is relevant, said lead author Lyza Maron.

“That has implications for adaptation,” said Maron, a research associate at the Robert W. Holley Center for Agriculture and Health at Cornell University. “It’s important, more than ever, that we can breed crops in a changing environment.”



 

Source: Fundacion Antama
April 16, 2013

Científicos estadounidenses identifican un gen que permite cultivar maíz en suelos pobres

Investigadores del Instituto de Genética de la Universidad de Florida (Estados Unidos) han descubierto un gen que permite a las plantas tolerar altos niveles de aluminio en suelos ácidos. Publicado en la revista Proceedings of the National Academy of Sciences, los científicos han descubierto que variedades con tres copias de este gen crecían con normalidad en suelos ácidos.

Según el Departamento de Agricultura de los Estados Unidos, el 30% del total de la tierra mundial es demasiado ácido para ser usado para la agricultura. El descubrimiento de este gen permitiría así usar estas tierras para cultivos mejorando las variedades a través de métodos biotecnológicos.

Los científicos han visto que las plantas que contienen tres copias de este gen crecen fácilmente en áreas ácidas tropicales y subtropicales. Una expresión genética que les confiere una mayor tolerancia al aluminio, un elemento tóxico para muchas plantas que imposibilita su crecimiento.

Según Matias Kirst, miembro del equipo de científicos y miembro del Instituto de Genética, “averiguar qué genes confieren a las plantas mayor tolerancia al aluminio es crucial para los agricultores que producen cultivos cuya productividad no es óptima debido a la acidez del suelo”.

“Es la primera vez en la que se demuestra que las copias de genes afectan al fenotipo de las plantas (…) A partir de ahora la gente va a prestar más atención a este tipo de variaciones para identificar y explicar rasgos”, matiza Kirst.

Este descubrimiento también demuestra que el número de copias de un gen podría ser la respuesta evolutiva de una planta para adaptarse a nuevas condiciones ambientales y meteorológicas.



More news from:
    . University of Florida
    . FundaciĆ³n Antama


Website: http://www.ufl.edu

Published: April 16, 2013

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