当前位置:首页>农业>中国农业大学潘灿平团队:释放抗真菌能力:硒纳米引发增强茉莉酸信号、抑制病原酶并激活植保素,以提高玉米对禾谷镰刀菌的抗性

中国农业大学潘灿平团队:释放抗真菌能力:硒纳米引发增强茉莉酸信号、抑制病原酶并激活植保素,以提高玉米对禾谷镰刀菌的抗性

  • 2026-05-15 18:22:03
中国农业大学潘灿平团队:释放抗真菌能力:硒纳米引发增强茉莉酸信号、抑制病原酶并激活植保素,以提高玉米对禾谷镰刀菌的抗性
禾谷镰刀菌引起的茎腐病及呕吐毒素(DON)污染严重威胁玉米产量与食品安全。传统化学杀菌剂面临抗药性、环境残留等问题,亟需可持续的绿色防控策略。本研究系统揭示了硒纳米颗粒(SeNPs)种子引发处理通过调控玉米代谢与转录重编程,增强抗病性的分子机制,为纳米技术应用于作物保护提供了理论依据。
图1 图形摘要
研究以“郑单958”玉米为材料,采用50 mg/L SeNPs溶液进行种子引发处理,随后接种禾谷镰刀菌。在感染后3天,通过生理生化测定、广泛靶向代谢组学、转录组学及分子对接等技术,系统比较了对照组与SeNPs处理组在DON含量、抗氧化系统、激素信号、植保素合成及病原相关基因表达等方面的差异。图2 SeNP引发对禾谷镰刀菌感染下玉米生长、呕吐毒素含量及相关基因表达的影响。(A)不同处理下玉米的外观图像;(B)生物量;(C)茎重;(D)株高;(E)呕吐毒素水平;(F)和(G)TRI1和TRI5基因的表达;(H)β-葡萄糖苷酶活性。统计显著性采用双尾学生t检验确定:p < 0.05,p < 0.01,p < 0.001。柱上不同小写字母表示根据Tukey多重比较检验存在显著差异(p < 0.05)
研究发现,SeNPs引发显著促进了玉米在病原胁迫下的生长,生物量、茎重和株高分别增加28.1%、64.8%和30.7%。同时,茎基部DON含量降低42.2%,关键毒素合成基因TRI1和TRI5的表达分别下调35.1%和19.9%,β‑葡萄糖苷酶活性也明显下降,表明真菌定殖能力受到抑制。在抗氧化防御方面,SeNPs处理显著提升了总抗氧化能力,激活了抗坏血酸‑谷胱甘肽循环,使AsA、GSH、GSH‑Px和GST水平升高,同时SOD活性适度下调而POD活性增强,最终使氧化损伤标志物丙二醛减少18%。这种精细调控既维持了适度的过氧化氢信号传导,又避免了氧化胁迫,并促进木质素合成以加固细胞壁。
图3 转录组与广泛靶向代谢组的整合分析(Se50对比CK,以及FgSe50对比FgCK)。(A)KEGG富集通路气泡图(Se50 vs CK);(B)KEGG富集通路气泡图(FgSe50 vs FgCK);(C)重点富集通路及通路关联图。
在激素信号层面,SeNPs引发促进了α‑亚麻酸向茉莉酸(JA)的代谢流动,JA含量显著上升,而水杨酸水平未发生明显变化。转录组分析显示,JA合成关键基因AOC和AOS上调,下游MYB、C2H2等转录因子被激活,进而驱动苯丙烷类和苯并噁唑啉酮类植保素的合成。具体而言,绿原酸含量增加402%,总酚酸上升5%;在苯并噁唑啉酮途径中,糖基化形式如DIBOA‑葡萄糖苷积累增多,其与病原毒力蛋白(PDB: 5E9H, 8H4P)的分子结合能力甚至强于苷元形式,形成“预储糖苷—病原水解—快速释放”的高效抗菌机制。此外,SeNPs引发还重塑了中心碳代谢,将乙酰辅酶A从三羧酸循环及DON合成途径分流至丙二酰辅酶A,优先供应酚酸合成,同时减少镰刀菌酸等毒力因子的积累。
综上所述,SeNPs种子引发通过三重协同机制增强玉米对禾谷镰刀菌的抗性:强化谷胱甘肽依赖的抗氧化脱毒系统,激活α‑亚麻酸‑JA信号轴以驱动植保素合成,以及重编程碳代谢将资源从毒素前体转向抗菌物质。本研究展示了纳米引发作为一种绿色、可持续的作物保护策略的应用潜力,为未来田间验证及与减量化农药协同使用提供了科学基础。
撰稿:王淼
审核:刘广洋
原文链接:https://doi.org/10.1016/j.jare.2026.03.025

免责声明
本文仅供科研分享,助力科学传播,不做盈利使用,如有侵权,请联系后台删除。部分图文资料来自网络,仅供科研分享,助力科学传播,不做盈利使用。转载内容不代表本公众号的观点和立场,本公众号不对其准确性、可靠性提供保证,仅供读者参考。如涉及侵权或未授权发布,请联系后台,我们将及时更正、删除,谢谢。
联系人:   刘广洋,中国农业科学院蔬菜花卉研究所质检中心,liuguangyang@caas.cn

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  1. CONNECT:[ UseTime:0.000523s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000546s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000247s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000273s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000468s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000577s ]
  8. SELECT * FROM `article` WHERE `id` = 526247 LIMIT 1 [ RunTime:0.000362s ]
  9. UPDATE `article` SET `lasttime` = 1778914640 WHERE `id` = 526247 [ RunTime:0.002074s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000232s ]
  11. SELECT * FROM `article` WHERE `id` < 526247 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000423s ]
  12. SELECT * FROM `article` WHERE `id` > 526247 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000343s ]
  13. SELECT * FROM `article` WHERE `id` < 526247 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000700s ]
  14. SELECT * FROM `article` WHERE `id` < 526247 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000715s ]
  15. SELECT * FROM `article` WHERE `id` < 526247 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000836s ]
0.091960s