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<p>Tomato (<i>Solanum lycopersicum</i>) is susceptible to the vascular pathogen <i>Clavibacter michiganensis</i>, which causes wilting, stem canker and plant death. In contrast, in the accession LA2157 of <i>S. arcanum</i>, a related wild species, <i>C. michiganensis</i> can spread into the xylem but plants do not exhibit wilting symptoms. Previous studies found that both species differ in the amount of xylem infection. Here we tested if that difference may result in contrasting hydraulic conductivity (HC) and water supply towards leaves. The latter was studied by means of its consequences: leaf water potential (WP), leaf growth and disease severity index (DSI). <i>S</i>. <i>lycopersicum</i> reduced leaf area and WP upon infection with <i>C</i>. <i>michiganensis</i>, consistent with the wilting symptoms reflected by the DSI. These results suggest a low water supply to the leaves that would result in low WP causing growth arrest and eventually leaf wilting. In contrast, infected <i>S</i>. <i>arcanum</i> LA2157 did not show wilting symptoms and maintained leaf growth and WP similar to non-infected plants, suggesting a higher water supply that results in higher WP that generates growth and prevents wilting. However, HC decreased similarly in both species upon infection, discarding this parameter as the source of the water supply difference. Nevertheless, in <i>S</i>. <i>lycopersicum</i> we observed more damage to the parenchyma cells of the pith area, which may be related to the known stem canker and discoloration symptoms and may compromise water transport recovery after cavitation and water supply to plant organs. This hypothesis opens new avenues for further research.</p>

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Morphophysiological consequences of bacterial canker infection in tomato and a wild relative: from hydraulic conductivity to leaf wilting

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Víctor Adrián Hernández-Aranda,
  • Ramón Jarquin-Gálvez,
  • José Pablo Lara-Ávila,
  • Juan Manuel Cevallos-Cevallos,
  • Martín Escoto-Rodríguez

摘要

Tomato (Solanum lycopersicum) is susceptible to the vascular pathogen Clavibacter michiganensis, which causes wilting, stem canker and plant death. In contrast, in the accession LA2157 of S. arcanum, a related wild species, C. michiganensis can spread into the xylem but plants do not exhibit wilting symptoms. Previous studies found that both species differ in the amount of xylem infection. Here we tested if that difference may result in contrasting hydraulic conductivity (HC) and water supply towards leaves. The latter was studied by means of its consequences: leaf water potential (WP), leaf growth and disease severity index (DSI). S. lycopersicum reduced leaf area and WP upon infection with C. michiganensis, consistent with the wilting symptoms reflected by the DSI. These results suggest a low water supply to the leaves that would result in low WP causing growth arrest and eventually leaf wilting. In contrast, infected S. arcanum LA2157 did not show wilting symptoms and maintained leaf growth and WP similar to non-infected plants, suggesting a higher water supply that results in higher WP that generates growth and prevents wilting. However, HC decreased similarly in both species upon infection, discarding this parameter as the source of the water supply difference. Nevertheless, in S. lycopersicum we observed more damage to the parenchyma cells of the pith area, which may be related to the known stem canker and discoloration symptoms and may compromise water transport recovery after cavitation and water supply to plant organs. This hypothesis opens new avenues for further research.