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PNAS|南京农业大学陈发棣教授团队揭示生长素调控菊花舌状花发育新机制

  • 2026-05-10 22:23:51
PNAS|南京农业大学陈发棣教授团队揭示生长素调控菊花舌状花发育新机制

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近日,南京农业大学园艺学院陈发棣教授团队在《美国国家科学院院刊》(PNAS)上发表了题为“An auxin-induced transcriptional cascade CmBES1-CmSAUR66 orchestrates the ray floret development in Chrysanthemum morifolium”的研究论文。

合瓣花(花瓣融合成花冠筒)是被子植物中一个重要的形态创新,尤其在菊类植物中普遍存在。然而,对于早期合瓣花类群(花瓣原基直接由环状原基形成)中花冠筒发生的遗传基础,长期以来知之甚少。菊花作为菊科的代表植物,其舌状花的花冠筒融合程度呈现出丰富的连续变异,是研究早期合瓣花发育的理想材料。

研究团队利用200份切花菊种质资源进行GWAS分析,结合不同花型(平瓣与管瓣)的转录组比较,筛选到一个与花冠筒融合程度显著关联的候选基因——CmSAUR66。该基因属于一个典型的早期生长素响应基因,在平瓣品种中的表达量显著高于管瓣品种。通过amiR技术沉默CmSAUR66后,舌状花的背侧花瓣原基在发育早期持续伸长,导致花冠筒融合程度显著提高,表明CmSAUR66是花冠筒融合的负调控因子。

图 CmSAUR66负调控舌状花花冠筒融合

进一步研究发现,CmSAUR66通过抑制背腹极性基因CmCYC2c在背侧花瓣中的表达来发挥功能。在野生型菊花中,CmCYC2c仅在腹侧花瓣中持续表达,而在背侧花瓣中逐渐减弱;而在CmSAUR66沉默植株中,CmCYC2c在背侧和腹侧花瓣中均有持续性表达。当在CmSAUR66沉默背景下瞬时沉默CmCYC2c时,增强的花冠筒融合表型得到部分恢复,证明CmSAUR66主要通过调控CmCYC2c的背腹不对称分布来控制花冠筒的形态建成。

外源生长素(IAA)处理实验表明,持续低浓度生长素处理可显著促进野生型菊花舌状花冠筒融合,同时抑制CmSAUR66的表达。有趣的是,在CmSAUR66沉默植株中,生长素促进冠管融合的效应大幅减弱,表明CmSAUR66是生长素信号调控冠管发育所必需的。通过酵母单杂交、ChIP-qPCR、EMSA和双荧光素酶报告实验,研究人员发现生长素能诱导转录因子CmBES1的表达,而CmBES1蛋白直接结合CmSAUR66启动子上的E-box元件并抑制其转录。在过表达CmBES1的植株中瞬时过表达CmSAUR66,可显著逆转由CmBES1过表达引起的管瓣表型,证明CmSAUR66在遗传上位于CmBES1下游。

该研究首次揭示了生长素通过CmBES1–CmSAUR66转录级联模块调控早期合瓣花冠筒形成的分子机制:高浓度生长素诱导CmBES1表达,后者直接抑制CmSAUR66转录,从而解除对背侧花瓣中CmCYC2c的抑制,促进背腹两侧花瓣同步伸长,形成管状舌状花;低浓度生长素则导致CmBES1低表达,解除对CmSAUR66的抑制,限制CmCYC2c在背侧花瓣中的表达,最终形成平瓣舌状花。这一模型不仅为菊花花型多样性的遗传改良提供了重要靶点,也为理解植物激素互作调控花器官形态进化提供了新见解。

图 生长素通过CmBES1-CmSAUR66模块调控舌状花发育的工作模型

南京农业大学园艺学院博士研究生贾棣文为论文共同第一作者,丁莲副教授陈发棣教授为共同通讯作者。蒋甲福教授陈素梅教授苏江硕副教授等团队成员共同参与了研究工作。该工作得到了国家自然科学基金重点项目、国家现代农业产业技术体系、江苏省种业振兴“揭榜挂帅”项目及中央高校基本科研业务费专项资金等资助。

论文链接

https://www.pnas.org/doi/10.1073/pnas.2527961123

植物科学最前沿,专注于植物科学前沿进展、资讯、招聘信息的发布及方法软件共享等投稿及招聘请后台回复“投稿”,均为无偿;商务合作请联系微信ID:zwkxqy ;

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  1. CONNECT:[ UseTime:0.000475s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000661s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001350s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000421s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000495s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000561s ]
  8. SELECT * FROM `article` WHERE `id` = 548723 LIMIT 1 [ RunTime:0.002292s ]
  9. UPDATE `article` SET `lasttime` = 1778715322 WHERE `id` = 548723 [ RunTime:0.007254s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000846s ]
  11. SELECT * FROM `article` WHERE `id` < 548723 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003463s ]
  12. SELECT * FROM `article` WHERE `id` > 548723 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005692s ]
  13. SELECT * FROM `article` WHERE `id` < 548723 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008849s ]
  14. SELECT * FROM `article` WHERE `id` < 548723 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001633s ]
  15. SELECT * FROM `article` WHERE `id` < 548723 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003840s ]
0.111205s