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Background and aims <p>Drought ranks among the most debilitating natural calamities, significantly impacting agricultural yield and quality. Rhizosphere microbes that live in the hot spot area play pivotal roles in helping crops resist environmental stress. While numerous studies have explored the dynamics of rhizospheric microbial diversity and community composition amid drought stress, the microbial response following the loss of drought-resistance genes in host plants remains mostly unknown.</p> Methods <p>Using three tomato genotypes, including wild-type, <i>slost1</i> mutants, and <i>slvoz1</i> mutants, we studied their rhizosphere microbial diversity, community composition, and association network under normal, moderate, and severe drought conditions at the flowering and fruiting stages.</p> Results <p>The <i>slvoz1</i> mutants had lower rhizosphere bacterial diversity compared with the wild-type and <i>slost1</i> under moderate drought conditions at the flowering stage, while no significant differences in diversity were observed among the treatments at the fruiting stage. Under different drought treatments, the plant genotypes had stronger impacts on the bacterial community composition at the flowering stage. Furthermore, we constructed microbial association networks and identified keystone species, noting the loss of potential drought-tolerant keystone taxa as well as keystone taxa that facilitate nutrient uptake (<i>Pedobacter</i> and Micropepsaceae) in the <i>slvoz1</i> samples at the flowering and fruiting stages, respectively.</p> Conclusion <p>Our study demonstrates that the rhizosphere bacterial responses to drought vary significantly among different plant genotypes. And these results suggest that the removal of drought-resistance genes is accompanied by the loss of drought-tolerant keystone species, indicating the links between specific genes and host-selected microbes.</p>

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Drought-sensitive tomato mutants may lose their keystone species with potential drought tolerance under water deficient conditions

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Xiaoyu Shi,
  • Xu Liu,
  • Tongyao Chen,
  • Linxiao Ping,
  • Xiangzhen Kong,
  • Yige Zhao,
  • Mengwei Xu,
  • Liya Ma,
  • Xiao Chen,
  • Yingfang Zhu,
  • Yu Shi

摘要

Background and aims

Drought ranks among the most debilitating natural calamities, significantly impacting agricultural yield and quality. Rhizosphere microbes that live in the hot spot area play pivotal roles in helping crops resist environmental stress. While numerous studies have explored the dynamics of rhizospheric microbial diversity and community composition amid drought stress, the microbial response following the loss of drought-resistance genes in host plants remains mostly unknown.

Methods

Using three tomato genotypes, including wild-type, slost1 mutants, and slvoz1 mutants, we studied their rhizosphere microbial diversity, community composition, and association network under normal, moderate, and severe drought conditions at the flowering and fruiting stages.

Results

The slvoz1 mutants had lower rhizosphere bacterial diversity compared with the wild-type and slost1 under moderate drought conditions at the flowering stage, while no significant differences in diversity were observed among the treatments at the fruiting stage. Under different drought treatments, the plant genotypes had stronger impacts on the bacterial community composition at the flowering stage. Furthermore, we constructed microbial association networks and identified keystone species, noting the loss of potential drought-tolerant keystone taxa as well as keystone taxa that facilitate nutrient uptake (Pedobacter and Micropepsaceae) in the slvoz1 samples at the flowering and fruiting stages, respectively.

Conclusion

Our study demonstrates that the rhizosphere bacterial responses to drought vary significantly among different plant genotypes. And these results suggest that the removal of drought-resistance genes is accompanied by the loss of drought-tolerant keystone species, indicating the links between specific genes and host-selected microbes.