<abstract xmlns="http://www.w3.org/1999/xhtml">

Mexico ranks 5th in worldwide resin production. <italic>Pinus oocarpa</italic> is the most widely tapped pine tree in Mexico. Michoacán (central-western Mexico) is the first nationwide state producer of resin. Despite the <italic>P. oocarpa</italic> relevance, there is no genetic improvement program in the country for resin production. We evaluated the degree of genetic control for growth, anatomical traits, resin yield, and the correlation among them at an early age (five-years-old for growth, six for resin, and anatomical traits) in a <italic>P. oocarpa</italic> half-sib progeny trial. Families were originated from selected mother trees, based on their resin yield. We found significant genetic variation among families for stem volume (<italic>h</italic><italic>2</italic><italic>i</italic>= 0.12, <italic>h</italic><italic>2</italic><italic>f</italic>= 0.35), traumatic ducts (diameter: <italic>h</italic><italic>2</italic><italic>i</italic>= 0.63, <italic>h</italic><italic>2</italic><italic>f</italic>= 0.51; area: <italic>h</italic><italic>2</italic><italic>f</italic>= 0.81), and resin yield (individual and family narrow-sense heritability: <italic>h</italic><italic>2</italic><italic>i</italic>= 0.20, <italic>h</italic><italic>2</italic><italic>f</italic>= 0.52), and a positive correlation between diameter and area of traumatic ducts with resin yield (Pearson correlation: <italic>r</italic>= 0.73, <italic>p</italic>= 0.04; <italic>r</italic>= 0.71, <italic>p</italic>= 0.0497; respectively). Results suggest that the early selection (six-years-old) of superior <italic>P. oocarpa</italic> families, based on resin yield (estimated by microchipping technique), and/or based on larger diameter and area of traumatic ducts, appears to be a feasible strategy to develop seed orchards able to provide genetically improved seeds for intensive resin tree plantations. That would be an important alternative for a state as Michoacán, Mexico, where natural <italic>P. oocarpa</italic> stands are being replaced for avocado orchards for exportation.
</abstract>

Mexico ranks 5th in worldwide resin production. Pinus oocarpa is the most widely tapped pine tree in Mexico. Michoacán (central-western Mexico) is the first nationwide state producer of resin. Despite the P. oocarpa relevance, there is no genetic improvement program in the country for resin production. We evaluated the degree of genetic control for growth, anatomical traits, resin yield, and the correlation among them at an early age (five-years-old for growth, six for resin, and anatomical traits) in a P. oocarpa half-sib progeny trial. Families were originated from selected mother trees, based on their resin yield. We found significant genetic variation among families for stem volume (h2i= 0.12, h2f= 0.35), traumatic ducts (diameter: h2i= 0.63, h2f= 0.51; area: h2f= 0.81), and resin yield (individual and family narrow-sense heritability: h2i= 0.20, h2f= 0.52), and a positive correlation between diameter and area of traumatic ducts with resin yield (Pearson correlation: r= 0.73, p= 0.04; r= 0.71, p= 0.0497; respectively). Results suggest that the early selection (six-years-old) of superior P. oocarpa families, based on resin yield (estimated by microchipping technique), and/or based on larger diameter and area of traumatic ducts, appears to be a feasible strategy to develop seed orchards able to provide genetically improved seeds for intensive resin tree plantations. That would be an important alternative for a state as Michoacán, Mexico, where natural P. oocarpa stands are being replaced for avocado orchards for exportation.

Traumatic ducts size varies genetically and is positively associated to resin yield of <italic>Pinus oocarpa</italic> open-pollinated progenies

Universidad Michoacana de San Nicolás de Hidalgo (UM SNH)

Departamento de Botánica, Instituto de Biología

Universidad Nacional Autónoma de México

Laboratorio de Genética y Microbiología

Silvae Genetica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Traumatic ducts size varies genetically and is positively associated to resin yield of  open-pollinated progenies

Mexico ranks 5th in worldwide resin production. Pinus oocarpa is the most widely tapped pine tree in Mexico. Michoacán (central-western Mexico) is the first...

Traumatic ducts size varies genetically and is positively associated to resin yield of Pinus oocarpa open-pollinated progenies

Publié en ligne: 27 juin 2022

Pages: 10 - 19

DOI: https://doi.org/10.2478/sg-2022-0002

Mots clés
heritability, open-pollinated families, tapping, defense system, growth, resin ducts, resin yield, diameter, traumatic ducts

© 2022 Irenka Fabián-Plesníková et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Traumatic ducts size varies genetically and is positively associated to resin yield of Pinus oocarpa open-pollinated progenies

Publié en ligne: 27 juin 2022

Pages: 10 - 19

DOI: https://doi.org/10.2478/sg-2022-0002

Mots clésheritability, open-pollinated families, tapping, defense system, growth, resin ducts, resin yield, diameter, traumatic ducts

© 2022 Irenka Fabián-Plesníková et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
heritability, open-pollinated families, tapping, defense system, growth, resin ducts, resin yield, diameter, traumatic ducts