<?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>2310-3469</journal-id>
<journal-title><![CDATA[Revista Cubana de Ciencias Forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev CFORES]]></abbrev-journal-title>
<issn>2310-3469</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Pinar del Río Hermanos Saíz Montes de Oca]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2310-34692023000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la posición de las acículas en la copa del árbol sobre la anatomía foliar de Pinus caribaea Morelet var. caribaea Barret y Golfari]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeito da posição da agulha no dossel sobre a anatomia da folha de Pinus caribaea Morelet var. caribaea Barret e Golfari]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of the position of the needles in the crown of the tree on the foliar anatomy of Pinus caribaea Morelet var. caribaea Barrett and Golfari]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sotolongo Sospedra]]></surname>
<given-names><![CDATA[Rogelio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Geada-López]]></surname>
<given-names><![CDATA[Gretel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-del Valle]]></surname>
<given-names><![CDATA[Luitmila]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Armas Crespo]]></surname>
<given-names><![CDATA[Norberto Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Pinar del Río "Hermanos Saíz Montes de Oca" Facultad Ciencias Forestales y Agropecuarias ]]></institution>
<addr-line><![CDATA[Pinar del Río ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Ciego de Ávila  ]]></institution>
<addr-line><![CDATA[Ciego de Ávila ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<volume>11</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2310-34692023000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2310-34692023000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2310-34692023000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las variaciones de la estructura de las hojas de las plantas se deben fundamentalmente a la variabilidad ambiental. En muchos casos la vía para la aclimatación a condiciones desfavorables. Está documentado que en Cuba las características anatómicas y morfológicas de las acículas de P. caribaea difieren entre ecótopos con distintas condiciones edafoclimáticas. En este estudio, se analiza el efecto que tiene la posición en la copa del árbol en la anatomía de las acículas. Para esto se colectaron acículas de la parte inferior, media y alta a 30 árboles. Las variables analizadas fueron grosor del parénquima clorofílico, grosor del parénquima de transfusión, altura del tejido de conducción y ancho del tejido de conducción, grosor de la cutícula, grosor de epidermis, grosor de hipodermis, número de capas de células de la hipodermis, número de canales y número de estomas. Los resultados de los análisis muestran una mayor diferenciación de la morfología de las acículas hacia la parte superior del árbol, que se expresa por el aumento del grosor de los tejidos de protección y relacionado con la mayor exposición al sol y menor humedad relativa a la que están expuestas. Las variables que más contribuyen a diferenciar las acículas según la posición en el árbol son el número de estomas y el número de células de la hipodermis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[SÍNTESE As variações na estrutura das folhas das plantas são devidas principalmente à variabilidade ambiental. Em muitos casos, é o caminho para a aclimatação a condições desfavoráveis. Está documentado que em Cuba as características anatômicas e morfológicas das agulhas de P. caribaea diferem entre ecótones com diferentes condições de solo e clima. Neste estudo, é analisado o efeito da posição do dossel sobre a anatomia das agulhas. Para este fim, as agulhas foram coletadas da parte inferior, média e superior de 30 árvores. As variáveis analisadas foram espessura do parênquima clorofila, espessura do parênquima transfusional, altura e largura do tecido de condução, espessura da cutícula, espessura da epiderme, espessura da hipoderme, número de camadas celulares da hipoderme, número de canais e número de estomas. Os resultados das análises mostram uma maior diferenciação na morfologia das agulhas em direção ao topo da árvore, que é expressa por um aumento na espessura dos tecidos protetores e está relacionada à maior exposição ao sol e à menor umidade relativa a que estão expostos. As variáveis que mais contribuem para diferenciar as agulhas de acordo com sua posição na árvore são o número de estômatos e o número de células na hipoderme.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Variations in the structure of plant leaves are mainly due to environmental variability. In many cases the way to acclimatize to unfavorable conditions. It is documented that in Cuba the anatomical and morphological characteristics of P. caribaea needles differ between ecotopes with different edaphoclimatic conditions. In this study, the effect of the position in the tree crown on the anatomy of the needles is analyzed. For this purpose, needles were collected from the lower, middle and upper part of 30 trees. The variables analyzed were thickness of the chlorophyll parenchyma, thickness of the transfusion parenchyma, height of the conduction tissue and width of the conduction tissue, cuticle thickness, epidermis thickness, hypodermis thickness, number of layers of hypodermis cells, number of channels and number of stomat. The results of the analyzes show a greater differentiation of the morphology of the needles towards the upper part of the tree, which is expressed by the increase in the thickness of the protective tissues and related to the greater exposure to the sun and lower relative humidity than they are exposed. The variables that contribute the most to differentiate the needles according to their position in the tree are the number of stomata and the number of cells in the hypodermis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[acícula]]></kwd>
<kwd lng="es"><![CDATA[variación anatómica]]></kwd>
<kwd lng="es"><![CDATA[copa del árbol]]></kwd>
<kwd lng="es"><![CDATA[canal de resina.]]></kwd>
<kwd lng="pt"><![CDATA[agulha]]></kwd>
<kwd lng="pt"><![CDATA[variação anatômica]]></kwd>
<kwd lng="pt"><![CDATA[canópia]]></kwd>
<kwd lng="pt"><![CDATA[canal de resina.]]></kwd>
<kwd lng="en"><![CDATA[needle]]></kwd>
<kwd lng="en"><![CDATA[anatomical variation]]></kwd>
<kwd lng="en"><![CDATA[resin canal]]></kwd>
<kwd lng="en"><![CDATA[tree crown.]]></kwd>
</kwd-group>
</article-meta>
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