Revista Chapingo Serie Ciencias Forestales y del Ambiente
Universidad Autónoma Chapingo
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Revista Chapingo Serie Ciencias Forestales y del Ambiente
Volume V, issue 2, July - December 1999
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Variación intraespecífica en el patrón de crecimiento  del brote terminal en Pinus greggii engelm.
Intraspecific variation in the growth pattern of the terminal bud in Pinus greggii engelm.

J. L. López-Ayala; J. Jesús Vargas-Hernández; C. Ramírez-Herrera; Javier López-Upton

http://dx.doi.org/0000

Received: 14/10/1999

Accepted: 11/01/2000

Available online: / pages.133-140

 

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  • descriptionAbstract

    A provenance/progeny test of Pinus greggii Engelm. was established in Patoltecoya, Puebla, in August 1994, to evaluate the level of its intraspecific  variation  in growth  and adaptive traits.   In this field test, five half-sib families of 12 provenances were included in a split-plot experimental design with five replications.Thirty-three months after planting, a significant variation (p≤0.001) was found both between and within provenances in height and diameter growth, as well as in number and average length of growth cycles. Southern provenances (Zimapán and Molango, Hidalgo, and El Madroño, Querétaro) had larger diameters and were taller than the northern provenances (Las Placetas, Nuevo León, Los Lirios, Coahuila, and San Juan, Coahuila). Differences in height between southern and northern provenances were due to differences in both number and average length of growth cycles. Family-mean heritability values were relatively high {h2>=.50) for all growth traits evaluated, except number of growth cycles, which  had a heritability of 0.35. individual-tree heritability for number of growth   cycles was  also  much lower  (h2=0.15)  than for the other traits (h2>0.30).   When inter- and  intra-population  variation  for  number  and length of stem growth  units for one of the growth  cycles  in 1997 was  evaluated  in a sample of populations and families, significant  differences were found for both components at the population level, but not at the family level.  Path analysis showed, however, that the number of  growth units has greater influence on length of  growth cycles than the average length of growth  units.  Therefore, number of growth units may be used in a breeding program.

    Keyworks: Provenance/progeny tria!, Pinus greggii Engelm, genetic variation,shoot growth pattern.
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  • starCite article

    López-Ayala, J. L.,  Vargas-Hernández, J. J.,  Ramírez-Herrera, C., &  López-Upton, J. (1999).  Intraspecific variation in the growth pattern of the terminal bud in Pinus greggii engelm.. Revista Chapingo Serie Ciencias Forestales y del Ambiente, V(2), 133-140. http://dx.doi.org/0000