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New Phytol | 南京农业大学郑录庆团队揭示OsWRKY18稳定OsbZIP48协同调控水稻锌稳态的分子机制

  • 2026-06-06 13:09:26
New Phytol | 南京农业大学郑录庆团队揭示OsWRKY18稳定OsbZIP48协同调控水稻锌稳态的分子机制

研究背景

锌(Zn)是植物生长发育所必需的微量元素,作为多种酶的辅因子参与光合作用、蛋白质合成和逆境响应。然而,全球约50%的可耕地存在缺锌问题,这不仅严重限制了作物的产量,还降低了籽粒的营养品质。在植物应对缺锌的调控网络中,F组碱性亮氨酸拉链(F-bZIP)转录因子(如拟南芥中的bZIP19/23)被公认为核心的“锌传感器”。在水稻中,OsbZIP48已被证实能直接激活OsZIP4OsZIP8等锌转运蛋白基因的表达。尽管F-bZIP在转录水平上的功能已较为明确,但在缺锌胁迫下,这些核心蛋白是如何在翻译后水平被精确调控以维持稳态的,目前仍是一个科学谜团。

论文概要

南京农业大学生命科学学院的郑录庆团队在植物科学主流期刊New Phytologist上发表了题为“OsWRKY18 attenuates proteasomal degradation of OsbZIP48 to orchestrate zinc homeostasis in rice”的论文,揭示了WRKY转录因子OsWRKY18作为OsbZIP48的关键翻译后调节因子的分子机制。研究发现,缺锌诱导表达的OsWRKY18能通过与OsbZIP48直接物理互作,屏蔽其泛素化修饰,从而减缓蛋白酶体途径的降解。这种蛋白水平的稳定作用强化了锌转运基因的转录激活,进而促进锌从根部向地上部的转运。该研究为理解植物微量元素稳态的翻译后调控提供了重要见解。

主要研究结果介绍

OsWRKY18响应缺锌胁迫的表达及定位特征

研究人员通过转录组数据筛选发现,OsWRKY18在缺锌(-Zn)条件下显著诱导表达。RT-qPCR时间序列分析显示,在持续缺锌处理9天后,其表达量达到峰值(图1)。组织特异性分析和GUS染色证明,OsWRKY18主要在分蘖期的根和叶片中表达,且其启动子活性受缺锌强烈激活(图1e)。亚细胞定位实验证实,OsWRKY18定位于细胞核和细胞质中(图1f)。

OsWRKY18缺失导致水稻耐低锌能力及转运效率下降

利用CRISPR/Cas9技术构建的oswrky18敲除突变体在正常锌水平下发育正常,但在低锌条件下表现出显著的生长抑制,包括株高降低、生物量减少以及新叶抽出延迟(图2)。元素分析显示,突变体根部积累了更多的锌,而地上部的锌含量显著降低(图3)。短时同位素Zn示踪实验进一步证实,OsWRKY18并不影响根系的锌吸收能力,但对其从根向地上部的转运至关重要(图3g)。

OsWRKY18与核心转录因子OsbZIP48发生物理互作

oswrky18osbzip48变体表型的高度相似性,研究人员推测两者存在功能关联。酵母双杂交(Y2H)结果显示,OsWRKY18能特异性结合OsbZIP48的N端区域(图4a)。体外Pull-down实验和活体内的荧光素酶互补影像(LCI)实验进一步确认了这种相互作用(图4b, 4c)。此外,OsWRKY18还能与OsbZIP48的同源蛋白OsbZIP50互作。

OsWRKY18通过减缓泛素介导的降解增强OsbZIP48稳定性

蛋白分析发现,在oswrky18突变体中,尽管OsbZIP48的转录水平保持不变(图6h),但其蛋白丰度却显著降低。相反,在烟草和水稻中过表达OsWRKY18显著增加OsbZIP48蛋白的积累(图5)。

进一步的机制研究表明,OsbZIP48主要通过26S蛋白酶体途径降解。OsWRKY18与OsbZIP48的结合显著降低了后者的泛素化水平(图6j),从而像一面“盾牌”一样保护OsbZIP48免受蛋白酶体的攻击。在缺锌条件下,OsWRKY18的诱导表达确保了OsbZIP48蛋白的强力积累,特别是在细胞核中的聚集(图6a)。

OsWRKY18协同增强锌转运基因的转录激活

通过双荧光素酶报告系统实验,研究人员发现OsWRKY18自身并不能直接激活OsZIP4OsZIP8的启动子,但当它与OsbZIP48共同表达时,能显著提升OsbZIP48对这些目标基因的转录激活效率(图7)。在oswrky18突变体中,缺锌诱导的OsZIP4OsZIP8OsZIP10的表达量均显著低于野生型(图8),这解释了为何OsWRKY18功能的缺失会导致锌转运障碍。

过表达OsWRKY18提升水稻的耐低锌潜力

为验证应用前景,研究人员创制了OsWRKY18过表达系。实验结果显示,在极低锌浓度下,过表达株系的生长状况、株高及生物量显著优于野生型(图9)。这与其体内较高水平的OsbZIP48蛋白及更旺盛的锌转运活性密切相关,提示OsWRKY18是改良水稻锌肥利用效率的潜在遗传靶点。

全文总结与展望

本研究构建了一个精细的水稻锌稳态调控模型(图10):在正常锌环境下,OsbZIP48蛋白维持在较低水平以防止锌中毒;当环境缺锌时,植物不仅维持OsbZIP48的基础转录,还诱导产生OsWRKY18蛋白。OsWRKY18通过与OsbZIP48物理结合,阻断其泛素化并抑制蛋白降解,从而快速提高OsbZIP48的蛋白丰度。这种翻译后水平的“稳定化作用”确保了水稻能迅速启动锌吸收和转运系统,增强对贫瘠土壤的适应性。

这一发现的重要科学意义在于,它解释了为何有些核心转录因子在转录水平不响应逆境,却能在蛋白水平实现动态调节。未来研究可进一步探讨OsWRKY18是否还参与其他微量营养元素的稳态平衡,以及如何利用该模块通过分子设计育种培育高产、富锌的水稻新品种。

研究团队与资助

该研究由南京农业大学生命科学学院郑录庆团队完成。Binbin Du为本文第一作者,郑录庆教授为通讯作者。研究得到了国家重点研发计划(2021YFF1000400)和国家自然科学基金(32570308, 12411530084, 32172668)等项目的资助。

DOI链接:https://doi.org/10.1111/nph.71290

投稿、合作等联系邮箱:ai4plantscience@163.com

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  1. CONNECT:[ UseTime:0.000719s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001119s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000572s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000561s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001102s ]
  6. SELECT * FROM `set` [ RunTime:0.000496s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001177s ]
  8. SELECT * FROM `article` WHERE `id` = 577702 LIMIT 1 [ RunTime:0.010932s ]
  9. UPDATE `article` SET `lasttime` = 1783852756 WHERE `id` = 577702 [ RunTime:0.001064s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000559s ]
  11. SELECT * FROM `article` WHERE `id` < 577702 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001017s ]
  12. SELECT * FROM `article` WHERE `id` > 577702 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000871s ]
  13. SELECT * FROM `article` WHERE `id` < 577702 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001925s ]
  14. SELECT * FROM `article` WHERE `id` < 577702 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.043953s ]
  15. SELECT * FROM `article` WHERE `id` < 577702 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022224s ]
0.220652s