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<p>Sorghum aphid is one of the main pests that harm sorghum production. Utilizing host plant resistance is the most economical and efficient approach for controlling sorghum aphid and enhancing sorghum yield. Photosynthesis, as the fundamental process for plant growth, is directly affected by pest infestations. However, whether aphid infestation affects photosynthesis in resistant sorghum carrying the <i>RMES1</i> gene remains unclear. This study aimed to explore the correlation between stable photosynthetic characteristics and the resistance to aphid infestation conferred by the <i>RMES1</i>. The aphid-resistant sorghum variety HN16 (WT, carrying the <i>RMES1</i> gene) and its susceptible mutant <i>asm1</i> (with a mutated <i>RMES1</i>) were used as research materials, and their photosynthetic parameters and photosynthetic pigment concentration during aphid feeding were measured; the expression of differentially expressed photosynthesis-related genes between the two materials were also analyzed and validated.The results showed that compared to <i>asm1</i>, WT exhibited higher chlorophyll fluorescence, stable PSII energy distribution, improved light-harvesting efficiency per unit area, a higher leaf performance index, increased photosynthetic pigment concentration, and stable gene expression during aphid infestation. These findings indicated that <i>RMES1</i>-mediated resistance in WT enhanced the efficiency of PSII, and improved the absorption and transmission of light energy, thereby maintaining photosynthetic activity during aphid infestation.</p>

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Stable photosynthetic characteristics are associated with aphid resistance in sorghum

  • 期刊论文

  • 发表日期：

    2025年9月6日

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  • Yutao Shao,
  • Peng Zhang,
  • Le Hao,
  • Yurui Zhang,
  • Jialing Li,
  • Zhenjie Wang

摘要

Sorghum aphid is one of the main pests that harm sorghum production. Utilizing host plant resistance is the most economical and efficient approach for controlling sorghum aphid and enhancing sorghum yield. Photosynthesis, as the fundamental process for plant growth, is directly affected by pest infestations. However, whether aphid infestation affects photosynthesis in resistant sorghum carrying the RMES1 gene remains unclear. This study aimed to explore the correlation between stable photosynthetic characteristics and the resistance to aphid infestation conferred by the RMES1. The aphid-resistant sorghum variety HN16 (WT, carrying the RMES1 gene) and its susceptible mutant asm1 (with a mutated RMES1) were used as research materials, and their photosynthetic parameters and photosynthetic pigment concentration during aphid feeding were measured; the expression of differentially expressed photosynthesis-related genes between the two materials were also analyzed and validated.The results showed that compared to asm1, WT exhibited higher chlorophyll fluorescence, stable PSII energy distribution, improved light-harvesting efficiency per unit area, a higher leaf performance index, increased photosynthetic pigment concentration, and stable gene expression during aphid infestation. These findings indicated that RMES1-mediated resistance in WT enhanced the efficiency of PSII, and improved the absorption and transmission of light energy, thereby maintaining photosynthetic activity during aphid infestation.