赤霉素促进低温胁迫下花生种子萌发的转录调控机制
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S565.2

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国家重点研发计划项目(2022YFD2300100)


Transcriptional Regulation Mechanism of Gibberellin Promoting Peanut Seed Germination under Low Temperature Stress
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    摘要:

    低温冷害是限制花生种子萌发的重要因素之一,赤霉素(GA)能够打破种子休眠,促进种子萌发。本研究以吉花25为试验材料,在4℃条件下,用赤霉素溶液浸种处理8 h,以清水浸种处理8 h为对照,28℃条件下发芽,统计24 h (吸水膨大期)露白率、72 h (胚根伸长期)发芽率,并对其取样进行转录组测序。结果表明,赤霉素处理使花生种子露白率和发芽率显著高于对照。转录组分析表明,胚根伸长期差异表达基因数大于吸水膨大期,两个时期有253个基因共表达。相关分析表明,MYBbHLHAP2/ERF-ERF类转录因子是促进花生种子萌发的主要转录因子。转录组分析表明,胚根伸长期差异表达基因数大于吸水膨大期,两个时期有253个基因共表达。相关分析表明,MYBbHLHAP2/ERF-ERF类转录因子是促进花生种子萌发的主要转录因子。赤霉素处理抑制了种子吸水膨大期赤霉素代谢关键酶基因AhGA2ox8的表达,提高了ABA降解途径CYP707A3基因的表达;胚根伸长阶段诱导赤霉素受体基因AhGID1的下调表达,促进了脱落酸不敏感蛋白基因5 AhABI5的上调表达。由此表明,外源GA处理花生种子,使脱落酸(ABA)和GA合成代谢及信号转导相关基因显著差异表达,提高了花生种子体内GA/ABA值,使花生种子打破休眠而萌发。

    Abstract:

    Low temperature damage is one of the important factors limiting peanut seed germination, and gibberellin can break seed dormancy and promote seed germination. This study used Jihua 25 as the experimental material and treated seeds with gibberellin solution at low temperature for 8h under 4℃ conditions, with seeds soaked in water solution for 8h as the control(CK). All seeds were germinated at 28℃. The white exposure rate at 24h (water absorption stage) and germination rate at 72 h(embryonic root extension stage) were recorded, and samples were taken for transcriptome sequencing. The results showed that GA treatment significantly increased the white exposure rate and germination rate of peanut seeds compared to the control treatment. Transcriptome analysis showed that the number of different expressed genes during the elongation stage of embryonic roots was greater than that during the swelling stage, with 253 genes co expressed during both stages. Relevant analysis indicates that MYB, bHLH, and AP2/ERF-ERF transcription factors are the main transcription factors promoting peanut seed germination. Transcriptome analysis showed that the number of differentially expressed genes during the elongation stage of embryonic roots was greater than that during the swelling stage, with 253 genes co expressed during both stages. Relevant analysis indicates that MYB, bHLH, and AP2/ERF-ERF transcription factors are the main transcription factors promoting peanut seed germination. The treatment with gibberellin inhibited the expression of AhGA2ox8, a key enzyme involved in gibberellin metabolism during the seed swelling stage, and increased the expression of CYP707A3 gene, a pathway for ABA degradation. The elongation stage of the embryonic root induces downregulation of the gibberellin receptor gene AhGID1 and promotes upregulation of the abscisic acid insensitive protein 5 gene AhABI5. This indicates that exogenous GA treatment of peanut seeds significantly differentially expressed genes related to ABA and GA synthesis metabolism and signal transduction, increased the GA/ABA ratio in peanut seeds, and promoted the breaking of dormancy and germination of peanut seeds.

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宋兆锋,张志民,丁红,李美君,赵跃,史普想,孙日丹,陈小姝,吕永超,宁洽,李春雨,高华援.赤霉素促进低温胁迫下花生种子萌发的转录调控机制[J].东北农业科学,2025,50(5):53-61.

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  • 收稿日期:2024-11-25
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  • 在线发布日期: 2025-11-11
  • 出版日期: 2025-10-25
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