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Evaluación de microorganismos con potencial de promoción de crecimiento vegetal y biocontrol de Spongospora subterranea
oleh: Juliana Soler Arango, Elizabeth Gilchrist Ramelli, Juan Carlos Pérez Naranjo
| Format: | Article |
|---|---|
| Diterbitkan: | Universidad Nacional de Colombia 2012-04-01 |
Deskripsi
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Esta enfermedad afecta las principales zonas productoras del mundo, debido a la falta de tratamientos efectivos contra el patógeno y al comercio de </span>tubérculos-semilla infectados. Algunas <span class="apple-style-span"><span style="color: black;">investigaciones indican que los agentes biocontroladores podrían contribuir a reducir la actividad de </span></span></span><span class="apple-style-span"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; font-weight: normal; mso-bidi-font-weight: bold;">S. subterranea</span></span><span class="apple-style-span"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic;"> a través de efectos sobre la viabilidad de sus quistosoros o mediante efectos estimulantes del crecimiento de la planta. En este estudio se emplearon bacterias </span></span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-fareast-language: ES-CO; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic; mso-no-proof: yes;">aisladas del interior de raíz, rizósfera y superficie de tubérculos de un cultivo de papa (</span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-fareast-language: ES-CO; font-weight: normal; mso-bidi-font-weight: bold; mso-no-proof: yes;">Solanum tuberosum</span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-fareast-language: ES-CO; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic; mso-no-proof: yes;"> variedad </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-fareast-language: ES-CO; font-weight: normal; mso-bidi-font-weight: bold; mso-no-proof: yes;">Diacol Capiro</span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-fareast-language: ES-CO; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic; mso-no-proof: yes;">) y seleccionadas por su capacidad para producir indoles totales y quitinasas. En estudios paralelos se determinó </span><span class="apple-style-span"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic;">su capacidad para promover la velocidad de germinación en brotes de tubérculos o para controlar <span style="mso-spacerun: yes;"> </span></span></span><span class="apple-style-span"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; font-weight: normal; mso-bidi-font-weight: bold;">S. subterranea</span></span><span class="apple-style-span"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic;"> en raíces y promover el crecimiento vegetal de plántulas en invernadero. </span></span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-fareast-language: ES-CO; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic; mso-no-proof: yes;">La mayoria de los aislamientos evaluados incrementraron la longitud de brotes de tubérculos en el laboratorio. En el invernadero, en suelo no estéril y en presencia d</span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; font-weight: normal; mso-bidi-font-weight: bold; font-style: normal; mso-bidi-font-style: italic;">el patógeno, se encontró que 2 de los 10 aislamientos seleccionados por su capacidad para producir indoles totales y quitinasas, presentaron promoción de crecimiento vegetal y posible biocontrol del patógeno. Estos resultados sugieren un gran potencial para la selección de microorganismos biocontroladores y desarrollo de bioproductos a partir de recursos microbiológicos locales</span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";;">.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; text-align: justify; line-height: normal;"><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";;">Palabras clave: </span></strong><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";;">sarna polvosa de la papa; indoles totales; quitinasas; control biológico.</span></p> <h2 style="margin: 0cm; margin-bottom: .0001pt; text-align: justify; line-height: normal;"><a name="_Toc316428970"></a></h2> <p class="MsoNormal" style="margin-bottom: .0001pt; text-align: justify; line-height: normal;"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US;" lang="EN-US"><strong>Abstract</strong>: The powdery scab of potato is caused by the pathogen <em style="mso-bidi-font-style: normal;"><span style="color: black;">Spongospora subterranea</span></em><span style="color: black;"> which reduces the quality and yield of tubers and facilitates the establishment of other pathogens. This disease affects main potato production zones in the world, </span>because there is not a completely effective and available control method against the disease, and due to the trading of infested seed tubers. Some research suggests that biological control agents could reduce the activity of <em style="mso-bidi-font-style: normal;">S. subterranea</em> through effects on the viability of their cystosoris or zoospores or by stimulating plant growth. <span style="color: black;">In this research, bacteria previously isolated, from inside the roots, the rhizosphere and tuber peel </span>of </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US; mso-fareast-language: ES-CO;" lang="EN-US">potato plants (<em style="mso-bidi-font-style: normal;">Solanum tuberosum </em>var. Diacol Capiro), </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; mso-ansi-language: EN-US;" lang="EN-US">were used, and then selected according to their capacity for producing </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US;" lang="EN-US">total indoles and chitinases. Here was tested in parallel studies the capacity of nine bacterial isolates differing in </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US; mso-fareast-language: ES-CO;" lang="EN-US">total indole and chitinase production, </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US;" lang="EN-US">for its capacity at increasing tuber sprout length and </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US; mso-fareast-language: ES-CO;" lang="EN-US">in promoting plant growth and biocontrol of </span><span class="apple-style-span"><em style="mso-bidi-font-style: normal;"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; mso-ansi-language: EN-US;" lang="EN-US">S. subterranea</span></em></span><span class="apple-style-span"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; color: black; mso-ansi-language: EN-US;" lang="EN-US">. Inoculated in excised minitubers </span></span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US;" lang="EN-US">in laboratory <span class="apple-style-span"><span style="color: black;">most </span></span></span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US; mso-fareast-language: ES-CO;" lang="EN-US">indole producing </span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US;" lang="EN-US">isolates tested resulted in increased tuber sprout length</span><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US; mso-fareast-language: ES-CO;" lang="EN-US">. In the greenhouse assay, in non-sterile soil and under a high pathogen pressure, two of the ten isolates selected because for their ability to produce total indoles and chitinases, showed plant growth promotion and possible biocontrol of the pathogen. These results suggest a great potential for the selection of biocontrol microorganisms and the development of new bioproducts from local microbial resources.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; text-align: justify; line-height: normal;"><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US;" lang="EN-US">Key words: </span></strong><span style="font-size: 10.0pt; font-family: ";Times New Roman";,";serif";; mso-ansi-language: EN-US;" lang="EN-US">powdery scab of potato; total indole; chitinases; biological control; PGPR. </span></p> <!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="true" DefSemiHidden="true" DefQFormat="false" DefPriority="99" LatentStyleCount="267"> <w:LsdException Locked="false" Priority="0" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Normal" /> <w:LsdException Locked="false" Priority="9" 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