{"id":62871,"date":"2008-12-02T00:00:00","date_gmt":"2008-12-02T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/respuesta-fisiologica-bioqua%c2%admica-y-molecular-de-las-leguminosas-a-estreses-abioticos\/"},"modified":"2008-12-02T00:00:00","modified_gmt":"2008-12-02T00:00:00","slug":"respuesta-fisiologica-bioqua%c2%admica-y-molecular-de-las-leguminosas-a-estreses-abioticos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisiologia-vegetal\/respuesta-fisiologica-bioqua%c2%admica-y-molecular-de-las-leguminosas-a-estreses-abioticos\/","title":{"rendered":"Respuesta fisiol\u00f3gica, bioqu\u00edmica y molecular de las leguminosas a estreses abi\u00f3ticos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Loreto Naya Aquilu\u00e9 <\/strong><\/h2>\n<p>Las leguminosas se caracterizan por su capacidad para establecer una relaci\u00f3n simbi\u00f3tica con rizobios del suelo que infectan lasra\u00edces de las leguminosas desarrollando n\u00f3dulos. En el interior de los n\u00f3dulos, las bacterias se diferencian a bacteroides y llevan acabo la fijaci\u00f3n biol\u00f3gica de n2 por parte del complejo enzim\u00e1tico nitrogenasa. Existen dos tipos de n\u00f3dulos, determinados eindeterminados. Los n\u00f3dulos determinados son caracter\u00edsticos de leguminosas de clima tropical (lotus, soja), tienen forma esf\u00e9rica yexportan el n en forma de ureidos, mientras que los n\u00f3dulos indeterminados se desarrollan en leguminosas de clima templado(alfalfa, guisante), son alargados y exportan el n en forma de amidas. En esta tesis se ha estudiado la respuesta a estr\u00e9s abi\u00f3tico deuna leguminosa modelo, lotus japonicus (lotus) y otra de inter\u00e9s agron\u00f3mico, medicago sativa (alfalfa) desde distintasperspectivas.Los dos primeros objetivos consistieron en determinar el mecanismo de inhibici\u00f3n de la fijaci\u00f3n de n2 y el an\u00e1lisis de la respuestadel metabolismo del c y de los sistemas antioxidantes, en los n\u00f3dulos de alfalfa por el estr\u00e9s h\u00eddrico. Se concluy\u00f3 que la inhibici\u00f3nde la nitrogenasa est\u00e1 causada por al menos tres factores: degradaci\u00f3n de las dos prote\u00ednas que constituyen el complejo nitrogenasa,una disminuci\u00f3n de la capacidad respiratoria de los bacteroides y el da\u00f1o oxidativo a los l\u00edpidos y prote\u00ednas de las c\u00e9lulas del n\u00f3dulo.Asimismo, se observ\u00f3 que la inhibici\u00f3n de la actividad sacarosa sintasa es posterior a la inhibici\u00f3n de la nitrogenasa, y por tanto nopuede ser causa de esta \u00faltima como se ha visto en otras leguminosas (soja, guisante y jud\u00eda). En relaci\u00f3n a los sistemasantioxidantes del n\u00f3dulo, la inducci\u00f3n de los genes cuznsodc, fesodp,apx, grc, soda, katb y katc indica que el estr\u00e9soxidativo afect\u00f3 tanto a las c\u00e9lulas nodulares como a los bacteroides. Una de las causas del estr\u00e9s oxidativo fue la disminuci\u00f3n deascorbato, y p<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Respuesta fisiol\u00f3gica, bioqu\u00edmica y molecular de las leguminosas a estreses abi\u00f3ticos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Respuesta fisiol\u00f3gica, bioqu\u00edmica y molecular de las leguminosas a estreses abi\u00f3ticos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Loreto Naya Aquilu\u00e9 <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Zaragoza<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 12\/02\/2008<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Manolo Becana Ausejo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: tom\u00e1s Ruiz arg\u00ed\u00bceso <\/li>\n<li>Jos\u00e9 Olivares pascual (vocal)<\/li>\n<li>pedro Aparicio tejo (vocal)<\/li>\n<li>ram\u00f3n Carpena ruiz (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Loreto Naya Aquilu\u00e9 Las leguminosas se caracterizan por su capacidad para establecer una relaci\u00f3n simbi\u00f3tica con rizobios [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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