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PJ| 安徽农业大学赵静/方从兵团队揭示草莓糖分积累关键调控模块FaDOF1.7-FaDOF1.5

  • 2026-06-08 14:12:29
PJ| 安徽农业大学赵静/方从兵团队揭示草莓糖分积累关键调控模块FaDOF1.7-FaDOF1.5

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糖分含量是决定草莓(Fragaria × ananassa)果实品质的核心指标之一,不仅直接影响甜度和风味感知,也关系到消费者接受度和市场价值。在草莓成熟过程中,蔗糖、葡萄糖和果糖等可溶性糖的动态积累,是果实品质形成的重要生理基础。近年来,随着果实品质育种和代谢工程研究的发展,解析果实糖代谢调控机制已成为园艺植物研究的重要方向。已有研究表明,糖代谢不仅依赖蔗糖合成酶、转化酶等关键代谢酶活性,还受到复杂转录调控网络的精细控制。DOF(DNA binding with one finger)转录因子家族是植物特有的一类锌指转录因子,广泛参与碳代谢、种子发育、激素响应及逆境适应等过程。然而,在草莓果实中,DOF转录因子如何协调糖代谢与可溶性糖积累,相关分子机制仍不清楚。

近日,安徽农业大学赵静副教授、方从兵教授团队在Plant Journal杂志发表了题为The FaDOF1.7-FaDOF1.5 module orchestrates soluble sugar accumulation in strawberry fruit的研究论文。该研究系统解析了FaDOF1.7与FaDOF1.5转录因子协同调控草莓果实糖代谢的分子机制,揭示二者通过激活蔗糖裂解相关基因促进葡萄糖、果糖及总可溶性糖积累,为草莓品质改良与代谢工程提供了新的理论基础。

研究人员首先比较分析了高糖草莓品种“宁丰”和低糖品种“嘎玛”在不同发育阶段的转录组数据,从中筛选到与糖含量显著相关的候选转录因子FaDOF1.7。FaDOF1.7属于DOF家族转录因子,定位于细胞核,在果实发育早期以及匍匐茎(stolons)中高表达。这一表达模式提示其可能参与植物碳分配及果实糖积累调控过程。

为了验证FaDOF1.7功能,研究进一步开展瞬时过表达和病毒诱导基因沉默(VIGS)实验。结果发现,FaDOF1.7过表达能够显著提高果糖、葡萄糖及总可溶性糖含量,而沉默FaDOF1.7则产生相反效应。进一步研究表明,FaDOF1.7能够激活三个关键糖代谢基因:蔗糖合成酶基因FaSUS1、FaSUS2以及细胞壁转化酶基因FaCWINV1。这些基因参与蔗糖裂解过程,可将蔗糖转化为葡萄糖和果糖,从而促进单糖积累,提高果实甜度。

研究进一步发现,FaDOF1.7能够与另一DOF转录因子FaDOF1.5发生物理互作。双荧光素酶(dual-luciferase)和β-葡萄糖醛酸苷酶(β-glucuronidase, GUS)实验表明,FaDOF1.5与FaDOF1.7协同增强对目标基因启动子的结合能力,从而显著提高FaSUS1、FaSUS2和FaCWINV1的转录活性。这一结果说明,FaDOF1.5和FaDOF1.7并非独立发挥作用,而是形成协同转录调控模块,共同调节糖代谢过程。

生化实验进一步验证,FaDOF1.5能够直接结合FaSUS1、FaSUS2和FaCWINV1启动子中的AAAG/CTTT顺式作用元件。这一结果说明,FaDOF1.5作为核心DNA结合因子,能够直接介导糖代谢相关基因表达,从而调控果实糖分积累。研究进一步构建了草莓和番茄稳定转基因材料。结果发现,无论过表达FaDOF1.5还是FaDOF1.7,均会降低蔗糖含量,但显著提高葡萄糖、果糖及总可溶性糖含量。值得注意的是,这种糖代谢改变并未影响果实成熟进程或果实表型,说明FaDOF1.5和FaDOF1.7主要特异性参与糖代谢调控,而不会干扰整体果实发育。这一结果对于果实品质定向改良具有重要意义。

综上所述,该研究系统揭示了FaDOF1.5-FaDOF1.7转录调控模块在草莓果实糖积累中的核心作用,阐明了其通过促进蔗糖裂解和单糖积累提高果实甜度的分子机制。从植物代谢调控角度来看,该研究深化了对果实糖代谢转录调控网络的认识,说明果实甜度形成并非简单依赖糖运输和积累,而是受到多层级转录调控机制精细控制。

原文链接:https://onlinelibrary.wiley.com/doi/10.1111/tpj.70915

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本文由本公众号翻译,内容以原文为准,仅用于学术分享。若有侵权,请联系小编删除或修改!
转载请注明出处:植物代谢研究

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  1. CONNECT:[ UseTime:0.001127s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001501s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000709s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000629s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001313s ]
  6. SELECT * FROM `set` [ RunTime:0.000569s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001871s ]
  8. SELECT * FROM `article` WHERE `id` = 537920 LIMIT 1 [ RunTime:0.001042s ]
  9. UPDATE `article` SET `lasttime` = 1780999267 WHERE `id` = 537920 [ RunTime:0.008151s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003254s ]
  11. SELECT * FROM `article` WHERE `id` < 537920 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001269s ]
  12. SELECT * FROM `article` WHERE `id` > 537920 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002358s ]
  13. SELECT * FROM `article` WHERE `id` < 537920 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001766s ]
  14. SELECT * FROM `article` WHERE `id` < 537920 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006613s ]
  15. SELECT * FROM `article` WHERE `id` < 537920 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003565s ]
0.203349s