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南京农业大学博士生一作在Nature Plants发表研究论文

  • 2026-05-30 17:22:02
南京农业大学博士生一作在Nature Plants发表研究论文

南京农业大学张正光教授团队近期在国际权威期刊Nature Plants上发表了突破性成果,题为A fungal nuclease effector subverts the chloroplast genome and triggers cell death to promote infection。这项研究首次揭示了稻瘟病菌在侵染后期的一种“终极战术”:直接攻击水稻细胞的“能量心脏”叶绿体,通过破坏其遗传物质来主动诱发细胞死亡,从而完成致命一击。这一发现彻底颠覆了以往关于病原菌仅通过“干扰”免疫信号致病的传统认知,证实了病菌能够“直接下令”摧毁宿主细胞的核心目标。

在植物与病原真菌漫长的生存博弈中,宿主细胞的生死抉择往往决定战局。作为水稻的“头号杀手”,稻瘟病菌的致病机制一直是研究热点。该团队鉴定出了一种名为MoNee6的关键效应蛋白,它宛如一枚“特制导弹”。在侵染后期,MoNee6大量生成并精准导航至水稻叶绿体,发挥其核酸酶(即“分子剪刀”)的活性,直接切割并降解叶绿体内部的DNA。这一破坏行为导致叶绿体基因表达全面停摆,相当于切断了细胞的能源供应与防御指令中心,最终引发水稻细胞死亡,为病菌的进一步扩散扫清了障碍。

然而,水稻并非坐以待毙。研究发现,水稻叶绿体内的Clp蛋白酶复合体(相当于“质检与回收站”)能够识别并降解入侵的MoNee6蛋白,构筑起一道天然防线。面对这一防御,狡猾的病菌演化出了反制手段:MoNee6蛋白会反向抑制叶绿体自身编码的关键组分OsCLPP1的表达,从而削弱Clp蛋白酶的“质检”能力,成功突破防御。

基于对这一精妙攻防机制的解析,研究团队提出了一种极具创新性的抗病育种策略。该策略的核心在于“迂回补给”:将OsCLPP1的“生产指令”从易受攻击的叶绿体DNA中转移至细胞核进行编码,待蛋白合成后再将其“送回”叶绿体工作。这种方式成功绕开了病菌对叶绿体基因组的破坏,恢复了Clp蛋白酶的活性。实验证实,这种策略不仅能显著增强水稻对稻瘟病的抗性,且不影响作物的正常生长发育。

该研究从细胞器遗传的全新维度,揭示了病原真菌操控宿主命运的“斩首”策略,为设计下一代广谱、持久的作物抗病方案开辟了新路径。鉴于此类效应蛋白在多种病原真菌中的广泛存在,该机制具有重要的普适性生物学意义与应用前景。

该论文由南京农业大学植物保护学院博士生王金涛担任第一作者,张正光教授刘昕宇副教授为共同通讯作者,张海峰教授、刘木星教授、李刚教授、杨雷云教授及美国路易斯安那健康科学中心Ping Wang教授等也参与了此项研究。

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  1. CONNECT:[ UseTime:0.000498s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000922s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000337s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000661s ]
  6. SELECT * FROM `set` [ RunTime:0.000254s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000700s ]
  8. SELECT * FROM `article` WHERE `id` = 512964 LIMIT 1 [ RunTime:0.003183s ]
  9. UPDATE `article` SET `lasttime` = 1780311243 WHERE `id` = 512964 [ RunTime:0.008980s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000282s ]
  11. SELECT * FROM `article` WHERE `id` < 512964 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000460s ]
  12. SELECT * FROM `article` WHERE `id` > 512964 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000851s ]
  13. SELECT * FROM `article` WHERE `id` < 512964 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000795s ]
  14. SELECT * FROM `article` WHERE `id` < 512964 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001480s ]
  15. SELECT * FROM `article` WHERE `id` < 512964 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000720s ]
0.088084s