<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952017000100013</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Response of Tunisian durum (Triticum turgidum ssp. durum) and bread (Triticum aestivum L.) wheats to water stress]]></article-title>
<article-title xml:lang="es"><![CDATA[Respuesta al estrés hídrico de trigos duros (Triticum turgidum ssp. durum) y harineros (Triticum aestivum L.) de Túnez]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayed]]></surname>
<given-names><![CDATA[Sourour]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rezgui]]></surname>
<given-names><![CDATA[Mohsen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Othmani]]></surname>
<given-names><![CDATA[Afef]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rezgui]]></surname>
<given-names><![CDATA[Mounir]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trad]]></surname>
<given-names><![CDATA[Hiba]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Jaime A. Teixeira-da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ben Younes]]></surname>
<given-names><![CDATA[Mongi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ben Salah]]></surname>
<given-names><![CDATA[Hamadi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kharrat]]></surname>
<given-names><![CDATA[Mohamed]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Regional Research Development Office of Agriculture in Semi Arid North West of Kef  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Tunisia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Carthage National Agricultural Research Institute of Tunisia Science and Agronomic Techniques Laboratory]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Tunisia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,National Agronomic Institute of Tunisia Department of Agronomy and Biotechnology Genetic and Plant Breeding Laboratory]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Tunisia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,aff4  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Japan</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<volume>51</volume>
<numero>1</numero>
<fpage>13</fpage>
<lpage>26</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952017000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952017000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952017000100013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Wheat is a staple crop in Tunisia, but little is known about the response of Tunisian durum wheat (Triticum turgidumssp.durum) and bread wheat (Triticum aestivum L.) to water stress. In semi-arid regions, where cereals are concentrated, grain yield is subject to water deficit especially due to variability in rainfall. Therefore, the objective of this study was to evaluate the response to water stress of three durum wheat (Mâali, Nasr and Salim) and two bread wheat (Tahent and Utique) varieties. The experimental design was a complete randomized block, water treatments were rainfed conditions (T0) and irrigation applied at the tillering and flowering stages (T1, control) with three replications per treatment, and data was analyzed by ANOVA and Tukey test to compare treatments means (p&#8804;0.05). Variables analyzed were grain yield and yield-related components: plants per square meter (NP), tillers per square meter (NT), ears per square meter (NE), seed per ear (NSE) and 1000-kernel weight (TKW). NP, NE, NSE and TKW were significantly affected by water stress, but there was no change on NT. Seed yield was weakly correlated with NE (r=0.376) but significantly correlated with NSE (r=0.604) and NP (r=0.639). Supplemental irrigation increased grain yield by 74.4%, 42.3%, 36.1%, 33.7% and 24.5% for Utique, Tahent, Nasr, Maâli and Salim, respectively, compared to control. Four drought tolerance indices, stress tolerance index (STI), stress tolerance (TOL), stress susceptibility index (SSI), and mean productivity (MP), were assessed and were adjusted based on grain yield under drought (Y s) and normal Yp) conditions. A positive and significant correlation between Ys and Y p with SSI and PM, respectively, indicate that they are the most suitable variables to select wheat genotypes in drought stress. These indices were able to screen a drought-tolerant genotype (Nasr), which showed the highest STI (1.10). In contrast, Salim showed the lowest STI (0.47) and was considered to be a drought-susceptible genotype.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El trigo es un cultivo básico en Túnez, aunque se sabe poco de la respuesta al estrés hídrico del trigo duro (Triticum turgidum ssp. durum) y el trigo harinero (Triticum aestivum L.) de Túnez. En regiones semiáridas, donde se concentran los cereales, el rendimiento de grano está sujeto al déficit hídrico, debido en especial a la variabilidad en le precipitación. Por lo tanto, el objetivo de este estudio fue evaluar la respuesta al estrés hídrico de tres variedades de trigo duro (Mâali, Nasr y Salim) y dos de trigo harinero (Tahent y Utique). El diseño experimental fue bloques completamente al azar, los tratamientos fueron en condiciones de secano (T0) e irrigación aplicada en los estados de brote y floración (T1, testigo) con tres repeticiones por tratamiento, y los datos fueron analizados por ANDEVA y prueba de Tukey para comparar medias entre tratamientos (p&#8804;0.05). Las variables analizadas fueron el rendimiento de grano y componentes relacionados con el rendimiento: plantas por metro cuadrado (NP), brotes por metro cuadrado (NT), espigas por metro cuadrado (NE), semillas por espiga (NSE) y peso de 1000-semillas (TKW). NP, NE, NSE y TKW fueron afectados por el estrés hídrico significativamente, pero NT no presentó cambios. El rendimiento de semillas presentó correlación menor con NE (r=0.376), pero significativa con NSE (r=0.604) y NP (r=0.639). Riegos suplementarios aumentaron el rendimiento de granos 74.4%, 42.3%, 36.1%, 33.7% y 24.5% en Utique, Tahent, Nasr, Mâali y Salim, respectivamente, comparado con el testigo. Cuatro índices de tolerancia se evaluaron y ajustaron al estrés hídrico, índice de tolerancia al estrés (STI ), tolerancia al estrés (TOL), índice de susceptibilidad al estrés (SSI) y productividad promedio (MP), con base en rendimiento de grano bajo sequía (Ys) y condiciones normales (Y p). Una correlación positiva y significativa entre Ys y Yp con SSI y PM, respectivamente, indica que son las variables más adecuadas para seleccionar genotipos de trigo con estrés hídrico. Estos índices pudieron seleccionar un genotipo tolerante al estrés por sequía (Nasr), que presentó el STI más elevado (1.10). En contraste, Salim presentó el STI menor (0.47), y se le consideró un genotipo susceptible.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Water stress]]></kwd>
<kwd lng="en"><![CDATA[durum wheat]]></kwd>
<kwd lng="en"><![CDATA[bread wheat]]></kwd>
<kwd lng="en"><![CDATA[grain yield]]></kwd>
<kwd lng="en"><![CDATA[yield components]]></kwd>
<kwd lng="es"><![CDATA[Estrés hídrico]]></kwd>
<kwd lng="es"><![CDATA[trigo duro]]></kwd>
<kwd lng="es"><![CDATA[trigo harinero]]></kwd>
<kwd lng="es"><![CDATA[rendimiento de grano]]></kwd>
<kwd lng="es"><![CDATA[componentes de rendimiento]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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