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Regulation of the OsNHX1 Gene Expression: Identification and Characterization of Novel Transcription Factors
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Resumo(s)
For half of the world´s population, rice is life. This cereal crop is
considered an important staple food worldwide, and more than three billion people
count on it for 50-80% of their daily calorie intake. Soil salinity is a major
environmental constraint to crop production, resulting in considerable yield losses
around the globe every year. According to the Food and Agriculture Organization
(FAO), in 2008 over 6% of world's total land and over 20% of irrigated land were
affected by high levels of salt. Irrigated land is only 15% of cultivated land, but it
produces one third of the world’s food, raising awareness about salinity as a
serious problem for crop productivity. Rice like as most crops is very sensitive to
salt, showing salt stress symptoms and reduced yield at relatively low soil salinity
levels (≈ 40 mM NaCl). Among the agronomically important cereals, rice shows
the highest sensitivity to salt. However, some degree of genotype tolerance for
salt stress is available in rice germplasm. To cope with salt stress conditions,
plants evolved several and diverse response mechanisms. One of these
mechanisms is tissue tolerance, in which high salt concentration is found in leaves
but is compartmentalized, especially in the vacuole, reducing the deleterious
effect of Na+ in the cytosol and driving water uptake to cells. Cation/H+ antiporters
mediate the transport of Na+ into the vacuole.(...)
Descrição
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Novel Transcription Factors
Contexto Educativo
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Instituto de Tecnologia Química e Biológica António Xavier. Universidade Nova de Lisboa