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<p>With the aim of determining the potential to select for chemical defences in <i>Pinus radiata</i>, we assessed the additive genetic variation underlying primary and secondary compounds in the needles of 2-year-old trees. The constitutive and induced levels of compounds were quantified using near infrared spectroscopy (NIRS) in 74 full-sib families in six protected replicates (<i>n</i> = 393) of a field trial. Induced effects were tested after subjecting alternate trees to artificial bark stripping, and genetic correlations estimated for damage in 20 surrounding unprotected replicates of the field trial comprising the same families. We showed: (i) the potential of NIRS to predict the primary and secondary compounds of <i>P. radiata</i> needles; (ii) significant additive genetic variation for the NIRS-predicted needle compounds; (iii) significant positive genetic correlations between plant height and levels of many of the primary and secondary needle compounds and several marginal genetic correlations of needle compounds with marsupial bark stripping; and (iv) a tendency for a reduction in sugars in the needles following artificial bark stripping, suggesting a systemic induced response. The results have significant implications for selection and breeding of needle primary and secondary compounds.</p>

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Genetic variation of the primary and secondary compounds of Pinus radiata and their relationship with bark stripping and growth

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Judith S. Nantongo,
  • Brad M. Potts,
  • Noel W. Davies,
  • Thomas Rodemann,
  • Hugh Fitzgerald,
  • Julianne M. O’Reilly-Wapstra

摘要

With the aim of determining the potential to select for chemical defences in Pinus radiata, we assessed the additive genetic variation underlying primary and secondary compounds in the needles of 2-year-old trees. The constitutive and induced levels of compounds were quantified using near infrared spectroscopy (NIRS) in 74 full-sib families in six protected replicates (n = 393) of a field trial. Induced effects were tested after subjecting alternate trees to artificial bark stripping, and genetic correlations estimated for damage in 20 surrounding unprotected replicates of the field trial comprising the same families. We showed: (i) the potential of NIRS to predict the primary and secondary compounds of P. radiata needles; (ii) significant additive genetic variation for the NIRS-predicted needle compounds; (iii) significant positive genetic correlations between plant height and levels of many of the primary and secondary needle compounds and several marginal genetic correlations of needle compounds with marsupial bark stripping; and (iv) a tendency for a reduction in sugars in the needles following artificial bark stripping, suggesting a systemic induced response. The results have significant implications for selection and breeding of needle primary and secondary compounds.