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<p>This study hypothesized that eucalypt plants from a clone susceptible to bacterial blight, caused by the bacterium <i>Erwinia psidii</i>, could display greater damage to their photosynthetic capacity in contrast to plants from a resistant one. This hypothesis was tested by combining the measurements of leaf gas exchange and chlorophyll (Chl) <i>a</i> fluorescence parameters on leaves infected by <i>E. psidii</i>. Symptoms of bacterial blight were more expressive on the leaves of plants from the susceptible clone at 15 days after inoculation. At this time, the photosynthetic machinery (e.g. impairments in energy dissipation and photoprotection) was profoundly damaged due to infection by <i>E. psidii</i>. By contrast, disease symptoms were absent on the leaves of plants from the resistant clone and the values for leaf gas exchange and Chl <i>a</i> fluorescence parameters were quite similar between non-inoculated and inoculated leaves. In conclusion, plants from the susceptible clone had their photosynthetic apparatus extensively damaged during infection by <i>E. psidii</i>. Factors related to the innate resistance of plants from the resistant clone hampered the infection process of <i>E. psidii</i>. Consequently, impairments in photosynthesis were not noticed based on the techniques used for its evaluation.</p>

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Contrasting photosynthetic performance of resistant and susceptible eucalypt clones in response to infection by Erwinia psidii

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Nilmara Pereira Caires,
  • Carlos Eduardo Aucique-Pérez,
  • Acelino Couto Alfenas,
  • Fabrício Ávila Rodrigues

摘要

This study hypothesized that eucalypt plants from a clone susceptible to bacterial blight, caused by the bacterium Erwinia psidii, could display greater damage to their photosynthetic capacity in contrast to plants from a resistant one. This hypothesis was tested by combining the measurements of leaf gas exchange and chlorophyll (Chl) a fluorescence parameters on leaves infected by E. psidii. Symptoms of bacterial blight were more expressive on the leaves of plants from the susceptible clone at 15 days after inoculation. At this time, the photosynthetic machinery (e.g. impairments in energy dissipation and photoprotection) was profoundly damaged due to infection by E. psidii. By contrast, disease symptoms were absent on the leaves of plants from the resistant clone and the values for leaf gas exchange and Chl a fluorescence parameters were quite similar between non-inoculated and inoculated leaves. In conclusion, plants from the susceptible clone had their photosynthetic apparatus extensively damaged during infection by E. psidii. Factors related to the innate resistance of plants from the resistant clone hampered the infection process of E. psidii. Consequently, impairments in photosynthesis were not noticed based on the techniques used for its evaluation.