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<p>Natural rubber production faces significant challenges in replanting and maximising yield. Conventional mature bud-grafting (MB) often suffers from inconsistent performance caused by rootstock heterogeneity and potential yield loss when the graft union enters the tapping window. This study evaluates the long-term field performance of elite <i>Hevea brasiliensis</i> clones using three rejuvenated plant types: in vitro plants on their own roots (IV), juvenile cuttings on their own roots (JC), and juvenile buddings (JB) onto seedling rootstock, against the mature budding onto seedling rootstock (MB) standard. We conducted large-scale randomised field trials in Ivory Coast comparing the performance of two commercially significant clones, RRIM600 and PB235, over five and six years of tapping, respectively. While RRIM600 demonstrated superior vegetative vigour (girth and conicity) with juvenile methods, the cumulative rubber yield over 5&#xa0;years did not differ significantly from MB. In contrast, the high-yielding clone PB235 demonstrated a statistically significant advantage: JC yielded 15% more than MB, and IV (7%) and JB (5%) also showed a better performance and greater yield stability in subsequent tapping years. The enhanced trunk conicity observed in juvenile materials promises a significant advantage as tapping moves to lower trunk positions in later years. For large-scale deployment, the JB method, which uses budwood from in vitro rejuvenated plants grafted onto seedling rootstock, appears to be the most promising. This study showed that the effect of propagation method depends on the clone, suggesting that long-term trials are still needed to determine the persistence of juvenile effects, the stability of yield responses over time, and whether the apparent advantages are maintained as tapping progresses to lower trunk positions.</p>

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Field performance of Hevea brasiliensis clones rejuvenated by somatic embryogenesis

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Eline Mignon,
  • Philippe De Groote,
  • Jean-Luc Hofs,
  • Daouda Kouassi,
  • Stefaan P. O. Werbrouck

摘要

Natural rubber production faces significant challenges in replanting and maximising yield. Conventional mature bud-grafting (MB) often suffers from inconsistent performance caused by rootstock heterogeneity and potential yield loss when the graft union enters the tapping window. This study evaluates the long-term field performance of elite Hevea brasiliensis clones using three rejuvenated plant types: in vitro plants on their own roots (IV), juvenile cuttings on their own roots (JC), and juvenile buddings (JB) onto seedling rootstock, against the mature budding onto seedling rootstock (MB) standard. We conducted large-scale randomised field trials in Ivory Coast comparing the performance of two commercially significant clones, RRIM600 and PB235, over five and six years of tapping, respectively. While RRIM600 demonstrated superior vegetative vigour (girth and conicity) with juvenile methods, the cumulative rubber yield over 5 years did not differ significantly from MB. In contrast, the high-yielding clone PB235 demonstrated a statistically significant advantage: JC yielded 15% more than MB, and IV (7%) and JB (5%) also showed a better performance and greater yield stability in subsequent tapping years. The enhanced trunk conicity observed in juvenile materials promises a significant advantage as tapping moves to lower trunk positions in later years. For large-scale deployment, the JB method, which uses budwood from in vitro rejuvenated plants grafted onto seedling rootstock, appears to be the most promising. This study showed that the effect of propagation method depends on the clone, suggesting that long-term trials are still needed to determine the persistence of juvenile effects, the stability of yield responses over time, and whether the apparent advantages are maintained as tapping progresses to lower trunk positions.