<?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>2215-3896</journal-id>
<journal-title><![CDATA[Revista de Ciencias Ambientales]]></journal-title>
<abbrev-journal-title><![CDATA[Ciencias Ambientales]]></abbrev-journal-title>
<issn>2215-3896</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-38962019000200047</article-id>
<article-id pub-id-type="doi">10.15359/rca.53-2.3</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Micropropagación de clones superiores de caoba (Swietenia macrophylla King) a partir de segmentos nodales]]></article-title>
<article-title xml:lang="en"><![CDATA[Micropropagation of Superior Clones of Mahogany (Swietenia macrophylla King) from Nodal Segments]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Vargas]]></surname>
<given-names><![CDATA[Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hine-Gómez]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional (UNA) del Instituto de Investigación y Servicios Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional (UNA) Instituto de Investigación y Servicios Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<fpage>47</fpage>
<lpage>59</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-38962019000200047&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-38962019000200047&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-38962019000200047&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La caoba es la especie forestal nativa económicamente más importante en Latinoamérica, se encuentra en el Apéndice II de CITES, debido a que registra un elevado índice de explotación, producto de la alta extracción sufrida a lo largo de décadas. El objetivo de esta investigación fue desarrollar un protocolo para el establecimiento in vitro de 2 clones (33 y 80), pertenecientes a un programa de mejoramiento genético forestal. Se lograron establecer segmentos nodales de los clones 83 y 33 en condiciones in vitro, al emplear hipoclorito de calcio al 15 % con un tiempo de exposición de 20 minutos. El mejor medio de cultivo para el establecimiento in vitro de los nudos fue el MS complementado con 3 % de sacarosa, 0.016 g/l de agrimicin y benlate, obteniéndose un 55 % de nudos establecidos a los 16 días de cultivo. En ambos clones se evaluó el efecto de 5 concentraciones de 6-Bencilaminopurina (6-BAP) (0.0, 0.44, 0.88, 1.33, 1.77 y 2.21 &#956;M L-1) sobre la brotación. Se obtuvo en promedio un brote por explante en los 5 tratamientos evaluados. No se observaron diferencias estadísticas significativas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Mahogany is the most economically important native forest species in Latin America, it is found in Appendix II of CITES, because it has a high exploitation rate, due to high extraction rates suffered over decades. The objective of this research was to develop a protocol for the in vitro establishment of two clones (33 and 80), belonging to a forest genetic improvement program. Nodal segments of clones 83 and 33 were established under in vitro conditions using 15 % calcium hypochlorite with an exposure time of 20 minutes. The best culture medium for in vitro establishment of the nodes was MS supplemented with 3 % sucrose, 0.016 g / l of agrimicin and benlate, obtaining 55 % of established nodes at 16 days of culture. In both clones, the effect of five concentrations of 6-Benzylaminopurine (6-BAP) (0.0, 0.44, 0.88, 1.33, 1.77, and 2.21 &#956;M L-1) was evaluated sprouting. On average, one outbreak per explant was obtained in the five 1treatments evaluated. No significant statistical differences were observed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[bencilaminopurina]]></kwd>
<kwd lng="es"><![CDATA[cultivo in vitro]]></kwd>
<kwd lng="es"><![CDATA[especie forestal]]></kwd>
<kwd lng="es"><![CDATA[nudos]]></kwd>
<kwd lng="es"><![CDATA[programa mejoramiento genético]]></kwd>
<kwd lng="en"><![CDATA[Benzylaminopurine]]></kwd>
<kwd lng="en"><![CDATA[forestry species]]></kwd>
<kwd lng="en"><![CDATA[genetic improvement program]]></kwd>
<kwd lng="en"><![CDATA[in vitro culture]]></kwd>
<kwd lng="en"><![CDATA[nodal segments]]></kwd>
</kwd-group>
</article-meta>
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