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<p>Low nocturnal temperatures (LNT) during early spring pose a significant constraint on the growth of protected tomatoes. Despite this, the effects of LNT stress on the soil microbial community and metabolite profiles in protected tomato cultivation remain insufficiently understood. To address this gap in knowledge, a 40-day controlled indoor incubation study was conducted to investigate the impact of LNT on soil physicochemical properties, bacterial diversity and composition, and metabolite profiles. Initially, after 10 days, no significant differences in soil physicochemical properties or bacterial community composition were observed among the LNT treatments. However, by day 20, the LNT treatment induced changes in the bacterial community composition. By day 40, a significant decrease in soil available phosphorus (AP) and dissolved organic carbon (DOC) was recorded. These reductions in AP and DOC content were associated with shifts in bacterial community composition, without affecting community richness. Notably, the genera <i>Streptomyces</i> and <i>Microvirga</i> were identified as key indicators of bacterial community changes under LNT stress. LNT stress was linked to a reduction in the abundance of bacterial genes involved in carbohydrate synthesis and an increase in genes associated with membrane synthesis. Furthermore, LNT enhanced membrane fluidity and increased the abundance of stress-responsive metabolites, such as linoleic acid, jasmonic acid, and brassinolide. Together, these results suggest that LNT influences soil microbial community composition and metabolite profiles by modulating AP and DOC levels, potentially redirecting resources toward cold adaptation mechanisms in protected tomato plants.</p> Graphical abstract <p></p>

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Low nocturnal temperature changed protected tomato soil bacterial community composition and metabolite characteristics

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Qingwen Shi,
  • Zhouping Sun,
  • Hongdan Fu,
  • Yufeng Liu,
  • Tianlai Li

摘要

Low nocturnal temperatures (LNT) during early spring pose a significant constraint on the growth of protected tomatoes. Despite this, the effects of LNT stress on the soil microbial community and metabolite profiles in protected tomato cultivation remain insufficiently understood. To address this gap in knowledge, a 40-day controlled indoor incubation study was conducted to investigate the impact of LNT on soil physicochemical properties, bacterial diversity and composition, and metabolite profiles. Initially, after 10 days, no significant differences in soil physicochemical properties or bacterial community composition were observed among the LNT treatments. However, by day 20, the LNT treatment induced changes in the bacterial community composition. By day 40, a significant decrease in soil available phosphorus (AP) and dissolved organic carbon (DOC) was recorded. These reductions in AP and DOC content were associated with shifts in bacterial community composition, without affecting community richness. Notably, the genera Streptomyces and Microvirga were identified as key indicators of bacterial community changes under LNT stress. LNT stress was linked to a reduction in the abundance of bacterial genes involved in carbohydrate synthesis and an increase in genes associated with membrane synthesis. Furthermore, LNT enhanced membrane fluidity and increased the abundance of stress-responsive metabolites, such as linoleic acid, jasmonic acid, and brassinolide. Together, these results suggest that LNT influences soil microbial community composition and metabolite profiles by modulating AP and DOC levels, potentially redirecting resources toward cold adaptation mechanisms in protected tomato plants.

Graphical abstract