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BACKGROUND

Wheat (Triticum aestivum L.) is a staple crop frequently enduring drought stress, significantly impacting its quantity and quality. Therefore, elucidating the underlying mechanisms of wheat's drought stress response is crucial for developing drought-tolerant varieties through molecular breeding techniques.

RESULTS

This study analyzed the transcriptome and metabolome of wheat seedlings with varying drought tolerance (drought-tolerant T13, control CK, and drought-susceptible T2) under drought stress. Results suggested that T13 and T2 had partially similar drought stress response mechanisms. But the mainly drought response mechanisms in T13 (accumulated flavonoids and phenolic acids) was different from T2 (accumulated alkaloids). Integrated metabolome and transcriptome analyses demonstrated significant up-regulation of most flavonoids and phenolic acids biosynthesis-related metabolites and genes (HCT, FLS, CHS and F3'5'H) in T13 under drought stress.

CONCLUSIONS

These results indicated that flavonoids and phenolic acids metabolisms were associated with wheat seedling's drought resistance, with their biosynthesis-related differentially expressed metabolites and genes possibly being key factors underlining the difference in drought tolerance. Thus this study enhances our understanding of wheat seedling's drought response mechanism, providing valuable insights for breeding drought-tolerant wheat cultivars.

BACKGROUND

RESULTS

CONCLUSIONS

背景

小麦（Triticum aestivum L.）是一种经常遭受干旱胁迫的主要作物，这对其产量和品质有重大影响。因此，阐明小麦干旱胁迫响应的潜在机制对于通过分子育种技术培育耐旱品种至关重要。

结果

本研究分析了不同耐旱性（耐旱品种T13、对照CK和干旱敏感品种T2）的小麦幼苗在干旱胁迫下的转录组和代谢组。结果表明，T13和T2具有部分相似的干旱胁迫响应机制。但T13中的主要干旱响应机制（积累黄酮类化合物和酚酸）与T2（积累生物碱）不同。综合代谢组和转录组分析表明，干旱胁迫下T13中大多数黄酮类化合物和酚酸生物合成相关代谢物和基因（HCT、FLS、CHS和F3'5'H）显著上调。