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ES&T | 噬菌体ΦNF-1:农业硝化控制的可持续生物解决方案

  • 2026-05-14 08:31:55
ES&T | 噬菌体ΦNF-1:农业硝化控制的可持续生物解决方案

现代农业对氮肥的高度依赖,在保障作物产量的同时,也因硝化作用引发了严重的环境问题——高达70%的施用氮素通过淋溶流失造成水体污染,或经反硝化作用以温室气体NO的形式释放到大气中。化学硝化抑制剂虽能在一定程度上缓解这一问题,但其存在持效期短、环境残留、非靶标生物毒性等缺陷,严重制约了农业的绿色可持续发展。近日,西班牙巴塞罗那大学团队在环境科学领域顶刊《Environmental Science & Technology》发表研究,系统评估了烈性氨氧化细菌(AOB)噬菌体ΦNF-1的硝化抑制效能、环境稳定性与制剂优化策略,证实其作为新型生物硝化抑制剂的巨大应用潜力,为农业氮素高效利用与面源污染防控提供了全新的噬菌体解决方案。

ΦNF-1的宿主范围拓展与硝化抑制效能

ΦNF-1是首个被报道可靶向土壤AOB硝化单胞菌属的烈性噬菌体,其基因组不含整合酶、毒素与抗生素抗性相关基因,具备生物防控应用的先天安全性。本研究首先通过土壤微宇宙实验,验证了ΦNF-1对硝化作用的抑制效果:在接种欧洲亚硝化单胞菌的施肥土壤中,MOI0.01ΦNF-1即可显著抑制亚硝酸盐的生成,10天时硝化抑制率最高达49.5%,同时伴随宿主细菌的持续裂解与噬菌体的稳定增殖。针对土壤土著AOB群落,ΦNF-1也展现出一定的硝化抑制活性,证实其在自然土壤环境中的功能有效性。

宿主范围是决定噬菌体田间应用广度的核心指标。本研究进一步拓展了ΦNF-1的可感染宿主谱,除已报道的3种硝化单胞菌外,ΦNF-1还可成功侵染寡养硝化单胞菌与多形亚硝化螺菌,成为目前已知首个可同时感染硝化单胞菌属与亚硝化螺菌属的AOB噬菌体。透射电镜观察证实,ΦNF-1可特异性吸附于易感宿主的细胞表面,而对非易感菌株无侵染能力,保证了其对靶标菌群的精准防控,避免对土壤非靶标微生物群落的扰动。

ΦNF-1的环境稳定性与田间应用适配性

噬菌体的环境存活能力是决定其田间应用效果的关键前提。本研究系统评估了不同储存与环境条件下ΦNF-1感染性的维持能力,结果显示,该噬菌体具备优异的长期储存稳定性:在4~20℃避光条件下,水悬液中的ΦNF-1感染性可稳定维持6个月以上,滴度下降不超过1个数量级;30℃储存条件下,其90%滴度衰减时间(T₉₀)仍可达4.05个月,完全满足农业制剂的储存与运输要求。

pH条件对ΦNF-1的稳定性具有显著影响。在中性至弱碱性环境(pH7~8)中,噬菌体感染性维持效果最佳,T₉₀可达4.5~5个月;pH6条件下感染性出现快速衰减,而酸性环境(pH≤5)可导致噬菌体在24小时内完全、不可逆失活,这一结果为ΦNF-1制剂的配方设计与田间施用场景选择提供了关键依据。土壤基质实验进一步证实,ΦNF-1在农业土壤中可维持长达6个月的感染性,T₉₀4.6~5.5个月,仅在砂质土壤中因非特异性吸附导致回收率显著下降,提示在砂质农田中需优化施用方案以保证噬菌体活性。

碳酸钙基光保护剂破解UV灭活瓶颈

太阳光与紫外线辐射导致的快速失活,是制约噬菌体田间叶面与土壤表层施用的核心瓶颈。本研究筛选了两种已获欧盟农业应用批准的市售肥料作为光保护剂,证实24%碳酸钙(CaCO)制剂可为ΦNF-1提供极强的UV与太阳光防护效果。无保护的ΦNF-1UV照射下30分钟内即完全丧失感染性,而添加24%CaCO后,噬菌体在8553.6mJ/cm²UV剂量照射24小时后,滴度仅下降1.5个数量级;自然太阳光下,CaCO可将ΦNF-1的感染性维持时间从3小时延长至4.8小时(露天)与12.99小时(温室覆盖条件),在农业土壤中也能显著提升噬菌体在UV与太阳光下的存活能力。

CaCO的光保护机制源于其对UV光线的散射与反射作用,同时可维持体系的弱碱性环境,进一步保障噬菌体衣壳蛋白与基因组的稳定性。尤为重要的是,CaCO作为常规农业用钙肥与叶面保护剂,不存在额外的监管审批障碍,可直接整合到ΦNF-1的制剂开发中,为该噬菌体的田间规模化应用扫清了关键技术障碍。

综上,本研究全面验证了噬菌体ΦNF-1作为生物硝化抑制剂的应用潜力,系统解决了其宿主范围、环境稳定性、田间光防护等核心应用问题,为替代化学硝化抑制剂、提升氮肥利用效率、减少农业氮素污染提供了安全、精准、可持续的新型工具。同时,本研究建立的噬菌体制剂优化策略,也为农业噬菌体生物防控产品的开发提供了可借鉴的研究范式。

参考文献:

Vique G, Blanco-Picazo P, Trenchs A, et al. Harnessing the Infectivity and Stability of Bacteriophage ΦNF‑1 in a Phage-Based Product for Sustainable Nitrification Control. Environ Sci Technol, 2026. 

https://doi.org/10.1021/acs.est.5c14179

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  1. CONNECT:[ UseTime:0.000820s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000965s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000298s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000573s ]
  6. SELECT * FROM `set` [ RunTime:0.000234s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000576s ]
  8. SELECT * FROM `article` WHERE `id` = 523596 LIMIT 1 [ RunTime:0.000466s ]
  9. UPDATE `article` SET `lasttime` = 1779366703 WHERE `id` = 523596 [ RunTime:0.001208s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000230s ]
  11. SELECT * FROM `article` WHERE `id` < 523596 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000424s ]
  12. SELECT * FROM `article` WHERE `id` > 523596 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000419s ]
  13. SELECT * FROM `article` WHERE `id` < 523596 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001182s ]
  14. SELECT * FROM `article` WHERE `id` < 523596 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000908s ]
  15. SELECT * FROM `article` WHERE `id` < 523596 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001628s ]
0.154817s