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南京农大张瑞福团队Nature子刊:水稻基因联手根际菌群,解锁有机氮养分提升产量 | 热心肠日报

  • 2026-02-02 20:07:09
南京农大张瑞福团队Nature子刊:水稻基因联手根际菌群,解锁有机氮养分提升产量 | 热心肠日报
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本文要点

IF: 13.6
Amino-acid-transporter-mediated assembly of rhizosphere microbiota enhances soil organic nitrogen acquisition in rice
Aiyuan MaWeibing XunShunan Zhang
Shuxin LiangWei WeiHan Huang沈其荣
徐国华张瑞福
Article|2026-01-30
10.1038/s41477-025-02217-0

研究背景与设计

针对水稻对土壤有机氮利用机制不明的问题,通过分析30份品种的地理分布规律,结合CRISPR-Cas9技术与合成菌群(SynM)策略,探究氨基酸转运蛋白基因变异对根际微生物组的调控机制。

核心发现与意义

粳稻携带的OsLHT1a等位基因通过定向招募产氨基酸功能菌群,建立了增强有机氮分解与吸收的基因-微生物协同系统,为提升有机肥利用效率及可持续农业提供了新路径。

地理分布关联

分布于高有机氮地区的粳稻普遍携带强功能单倍型OsLHT1a,其根际显著富集蛋白酶活性较高的菌群,而携带OsLHT1b的籼稻则伴随较强的无机氮矿化功能。

合成菌群功能

由8株核心菌株构建的SynM在有机质分解中显著释放氨基酸,并反馈上调根系OsLHT1表达,在有机肥条件下使水稻产量显著提升12.38%。

基因驱动组装

利用Oslht1-1突变体及回交群体证实,OsLHT1功能是SynM在根际有效定殖的先决条件,且有机肥输入显著强化了这种基因驱动的微生物组装过程。

跨代遗传稳定性

SynM介导的促生长及氮吸收增强效应在携带OsLHT1a基因型的个体中具有跨代遗传特性,实现了对有机肥肥效的长效维持。

核心关键词

植物-菌群互作氨基酸转运蛋白水稻根际微生物组OsLHT1可持续农业

科普解读

对于生活在土壤有机质丰富区域的粳稻来说,土壤中的游离氨基酸是其可直接吸收利用的宝贵有机氮源。然而,这种氮的“馈赠”高度依赖于微生物对有机物的分解。长久以来,科学家观察到粳稻比籼稻更能高效吸收氨基酸,却对背后潜在的基因-微生物协同机制知之甚少。

一项发表于Nature Plants的研究,由南京农业大学的徐国华与张瑞福团队领衔,揭开了这一谜团:一个被称为OsLHT1的氨基酸转运蛋白基因,其特定变异形式(OsLHT1a单倍型)不仅自身是高效的“氮泵”,还能像一位精准的“管家”,在根部招募并组建一支功能专一的“细菌工程队”,共同打通从有机质分解到氮吸收的快速通道。

基因变异下的地理“适氮”规律

研究团队首先在中国主要稻区收集了30个代表性水稻品种。他们发现,具有高效氨基酸吸收能力的OsLHT1a单倍型,主要分布在高纬度、土壤有机质丰富的地区,且与粳稻品种高度重合。而吸收能力较弱的OsLHT1b单倍型则多见于低纬度、土壤有机氮含量较低的区域。数据分析显示,水稻的氨基酸吸收能力与土壤游离氨基酸含量有机质含量呈显著正相关。这表明,OsLHT1的基因变异可能是一种对环境氮素形态的适应性进化。

更深入的分析揭示,两种单倍型根际的细菌群落构成存在显著差异。OsLHT1a单倍型的根际菌群,其预测功能更倾向于将有机物分解为氨基酸,而OsLHT1b单倍型的菌群则更偏向于传统的氮矿化过程(将有机氮转化为无机氮)。这暗示,高效吸收基因可能通过“招募”特定的功能菌群,来优化对有机氮的利用策略。

有机肥田里的“精准招募”

为了排除土壤类型和微生物地域分布的干扰,团队在长期施用有机肥化肥的同一类型土壤中,种植了携带不同单倍型的水稻。结果证实,OsLHT1a单倍型在有机肥条件下,其氨基酸吸收和氮积累能力表现尤为突出,而OsLHT1b单倍型则反应平平。关键在于,只有在有机肥土壤中,两种单倍型的根际菌群结构才出现显著分化。

研究人员从OsLHT1a单倍型的根际分离出285株细菌,并与测序数据比对,锁定了50株被该单倍型特异性富集的菌株。功能测试发现,超过一半的菌株擅长分解有机底物、大量释放氨基酸,另有11株菌能显著上调水稻根中OsLHT1基因的表达。研究团队从中精选出功能最强的8株菌(4株高效产氨基酸,4株强力促表达),构建了一个人工合成菌群(SynM)

基因是菌群定植的“总开关”

为了确认OsLHT1基因在其中的核心作用,团队利用基因编辑技术创制了OsLHT1功能缺失的突变体。在有机肥土壤中,野生型和杂合型水稻接种SynM后,株高、氨基酸和总氮积累均显著提升,而突变体则几乎没有任何响应。根际微生物群落分析显示,SynM在野生型和杂合型根际的定植丰度远高于突变体。然而,在化肥土壤中,所有基因型对SynM的响应都微乎其微。这表明,OsLHT1基因的功能是SynM发挥有益作用的前提,而有机肥提供的环境则是这一互作得以实现的“土壤”。

跨代传承的菌群“遗产”

一个更有趣的现象在跨代实验中被发现。在有机肥土壤中,第一代接种了SynM的OsLHT1a单倍型水稻,其促进生长的效应能够传递给未接种的第二代。这一“遗产”效应在OsLHT1b单倍型或OsLHT1突变体中均未出现。这证明,OsLHT1基因不仅负责招募功能菌群,还能帮助这些有益菌在根际稳定定植并跨代维持,形成可遗传的互利共生关系。

从盆栽走向田间的增产潜力

最终的田间试验验证了这一协同机制的实用价值。在有机肥田间接种SynM,能够提高根际土壤的游离氨基酸浓度,并显著增强水稻根系对氨基酸的吸收能力,最终使理论稻谷产量提升12.38%。在化肥田间,虽然氨基酸吸收也有提升,但由于缺乏足够的有机底物,增产效果仅为5.31%。这清晰地展示了“高效基因-功能菌群-有机肥管理”三者结合的巨大潜力。

该研究描绘了一幅植物与微生物协同进化的精细图景:水稻通过关键基因的变异,主动塑造其根际微环境,招募并锁定能够补足自身营养获取短板的微生物伙伴。这一发现不仅深化了我们对植物-微生物互作的理解,也为未来通过微生物辅助育种精准施肥管理,培育高效利用有机养分、减少化肥依赖的水稻新品种,提供了坚实的科学基础和创新思路。

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  1. CONNECT:[ UseTime:0.000495s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000702s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000302s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002062s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000589s ]
  8. SELECT * FROM `article` WHERE `id` = 473672 LIMIT 1 [ RunTime:0.000383s ]
  9. UPDATE `article` SET `lasttime` = 1770488593 WHERE `id` = 473672 [ RunTime:0.000602s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000211s ]
  11. SELECT * FROM `article` WHERE `id` < 473672 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000709s ]
  12. SELECT * FROM `article` WHERE `id` > 473672 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003392s ]
  13. SELECT * FROM `article` WHERE `id` < 473672 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005107s ]
  14. SELECT * FROM `article` WHERE `id` < 473672 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005072s ]
  15. SELECT * FROM `article` WHERE `id` < 473672 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008220s ]
0.114259s