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<p>In the summer of 2023, sunflower plants in commercial plots in Calera de Víctor Rosales, Zacatecas, developed multiple flower heads and leaf buds, and younger leaves were long, deformed, and wide, suggesting phytoplasma infection. The 16S rDNA and <i>SecY</i> genes from phytoplasma were amplified using polymerase chain reaction and subjected to virtual restriction fragment length polymorphism analysis (iPhyClassifier). The phytoplasma identified in symptomatic plants (mother plants), and their seeds and emergent seedlings corresponded to the ‘Ca. P. trifolii’ strain, group 16SrVI-A. Seeds from symptomatic mother plants had a normal shape and color, but their length, width and mass were smaller than those of asymptomatic plants. In addition, germination was delayed, and resultant plants had developmental defects, including aborted flowers and retarded growth. This is the first report of a ‘Ca. P. trifolii’-related phytoplasma in sunflowers causing a new symptomatology in Mexico and confirms transmission of this phytoplasma through seeds and seedlings from diseased sunflower plants.</p>

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‘Candidatus Phytoplasma trifolii’-related phytoplasma detected in sunflower (Helianthus annuus) in Mexico and its transmission to seeds and seedlings

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Jorge Armando Mauricio-Castillo,
  • Luis Roberto Revéles-Torres,
  • Fátima Berenice Salazar-Badillo,
  • Silvia Salas-Muñoz

摘要

In the summer of 2023, sunflower plants in commercial plots in Calera de Víctor Rosales, Zacatecas, developed multiple flower heads and leaf buds, and younger leaves were long, deformed, and wide, suggesting phytoplasma infection. The 16S rDNA and SecY genes from phytoplasma were amplified using polymerase chain reaction and subjected to virtual restriction fragment length polymorphism analysis (iPhyClassifier). The phytoplasma identified in symptomatic plants (mother plants), and their seeds and emergent seedlings corresponded to the ‘Ca. P. trifolii’ strain, group 16SrVI-A. Seeds from symptomatic mother plants had a normal shape and color, but their length, width and mass were smaller than those of asymptomatic plants. In addition, germination was delayed, and resultant plants had developmental defects, including aborted flowers and retarded growth. This is the first report of a ‘Ca. P. trifolii’-related phytoplasma in sunflowers causing a new symptomatology in Mexico and confirms transmission of this phytoplasma through seeds and seedlings from diseased sunflower plants.