Genetic variation in survival, growth, and stem form of Pinus leiophylla< in Brazil and South Africa and provenance resistance to pitch canker

  • WS Dvorak Camcore, North Carolina State University, Box 8008, Jordan Hall Extension, Raleigh 27695, North Carolina, USA
  • GR Hodge Camcore, North Carolina State University, Box 8008, Jordan Hall Extension, Raleigh 27695, North Carolina, USA
  • JE Kietzka&#8224 Deceased; formerly: Mondi Business Paper Ltd, PO Box 39, Pietermaritzburg 3200, South Africa


Pinus leiophylla is a relatively common pine that occurs in the mountains of western and central Mexico. Between 1987 and 1990, Camcore, North Carolina State University, sampled 11 populations and 309 mother trees of the species to determine patterns of genetic variation in survival, growth and stem form. Fifteen provenance/progeny trials were established in southern Brazil and South Africa across a wide range of sites and assessed at 3, 5 and 8 years of age for height, diameter and stem form. Results indicated that average productivity ranged from 5 to 19m3 ha–1 y–1 depending on the site and that performance was not as competitive as P. patula (South Africa) and P. taeda (Brazil) controls. Provenances from central Mexico (Michoacán) were statistically better in productivity than those from the southern part of the country (Oaxaca), which in turn were superior to those from the northern part of the country (Durango). However, provenances from northern Mexico exhibited superior survival to seed sources from other locations in Mexico when grown on cold sites (winter minimums –10 to 5°C) in South Africa and superior stem form across all locations. Seedlings from the original 11 provenances were screened for resistance to the pitch canker fungus (PCF; Fusarium circinatum). Results indicated that generally P. leiophylla is as susceptible to PCF as P. patula (stemkill = 85%) with the exception of two fast-growing, moderately resistant populations from Michoacán, La Pinalosa (stemkill = 44%) and Ario de Rosales (stemkill = 73%). The future potential of P. leiophylla might be in hybrid combination with P. patula in the seasonally dry areas of southern Africa where fires are common and pitch canker is a problem.

Keywords: climatic models, heritability, vegetative propagation

Southern Hemisphere Forestry Journal 2007, 69(3): 125–135

Journal Identifiers

eISSN: 2070-2639
print ISSN: 2070-2620