甘蔗分蘖与生长发育过程中ScD27.2基因的调控机制

doi:10.1016/j.jia.2025.04.017

Journal of Integrative Agriculture ›› 2026, Vol. 25 ›› Issue (2): 694-708.DOI: 10.1016/j.jia.2025.04.017

甘蔗分蘖与生长发育过程中ScD27.2基因的调控机制

收稿日期:2024-10-31 修回日期:2025-04-18 接受日期:2025-03-18 出版日期:2026-02-20 发布日期:2026-01-06

ScD27.2 gene regulation mechanism during sugarcane tillering and growth

Zhuandi Wu^{1, 2}, Xin Hu^{1, 2}, Wenzhi Wang³, Zhengying Luo^{1, 2}, Naveed ur Rehman^{1, 2}, Peifang Zhao^{1, 2}, Jiayong Liu^{1, 2}, Shuzhen Zhang³, Fenggang Zan^{1, 2#}, Xinlong Liu^{1, 2#}, Jiawen Guo^{1, 2#}

¹ National Key Laboratory for Biological Breeding of Tropical Crops of Ministry of Science and Technology, Kunming 650205, China
²Sugarcane Research Institute, Yunnan Academy of Agricultural Sciences/Yunnan Key Laboratory of Sugarcane Genetic Improvement, Kaiyuan 661699, China
³ Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China

Received:2024-10-31 Revised:2025-04-18 Accepted:2025-03-18 Online:2026-02-20 Published:2026-01-06
About author:Zhuandi Wu, E-mail: judith1123@126.com; #Correspondence Fenggang Zan, E-mail: fengang88@126.com; Xinlong Liu, E-mail: lxlgood868@163.com; Jiawen Guo, E-mail: 79jwguo@163.com
Supported by:
This project was funded by the National Natural Science Foundation of China (31860405); the National Key Laboratory for Tropical Crop Breeding, China (NKLTCB-YAAS-2024-S05); the Yunnan Provincial Modern Agricultural Technology System, China; the Yunnan Provincial Science and Technology Innovation Talent Program, China (202305AD160041); the Yunnan Provincial “Xingdian Talent Support Program”, China; the Yunnan Haizhi Station for Sugarcane Research Institute of Yunnan Academy of Agricultural Sciences, China (HHZ202201); and the Yunnan Provincial Key Research and Development Program, China (202403AM140025).

摘要/Abstract

摘要：

分蘖数量是决定甘蔗（Saccharum spp. hybrids）产量的关键农艺性状。独脚金内酯（Strigolactones, SLs）作为植物激素，对株型建成具有重要调控作用。DWARF27（D27）是SL生物合成途径中的关键酶，可催化类胡萝卜素的可逆异构化反应。甘蔗D27同源基因ScD27.2的启动子区含有非生物胁迫响应元件，提示其在SL生物合成与胁迫应答中具有重要作用，可能通过调控分蘖数等性状影响甘蔗产量。阐明其调控机制将为培育高产、抗逆甘蔗新品种提供理论依据。本研究通过RNA干扰（RNAi）和过表达（OE）技术对甘蔗品种新台糖22号（XTT22）中关键胡萝卜素异构酶基因ScD27.2进行遗传调控。结果显示：与野生型相比，ScD27-RNAi-2株系的ScD27.2表达量显著降低，分蘖数显著增加；而ScD27-OE-1、ScD27-OE-5和ScD27-OE-9株系的基因表达量显著升高，分蘖数显著减少。其中ScD27-OE-9株系侧芽萌发明显受抑，而ScD27-RNAi-2株系耐旱性显著降低。在正常光温水管理条件下，转基因植株的分蘖数和株高均呈现显著差异。长期干旱胁迫下，ScD27-RNAi-2株系的株高显著低于野生型和ScD27-OE-9株系，呈现矮化多蘖表型。进一步检测发现ScD27-RNAi-2株系的SLs含量显著下降。本研究推测ScD27.2通过调控甘蔗分蘖数响应干旱胁迫，且干旱相关转录因子ScMYB44可能参与ScD27.2对干旱胁迫的应答过程。

Abstract:

Tiller number represents a critical agronomic trait determining sugarcane yield. Strigolactones (SLs) are plant hormones regulating plant architecture. D27, an essential enzyme in the SL biosynthetic pathway, catalyzes a reversible isomerization reaction. ScD27.2, the D27 homolog in sugarcane, contains abiotic stress-responsive elements in its promoter, suggesting its potential importance in SL biosynthesis and stress tolerance. ScD27.2 potentially optimizes sugarcane agronomic traits, particularly tiller number and yield. Understanding its mechanisms will advance the development of high-yielding, stress-tolerant sugarcane varieties. To investigate the role of D27 in sugarcane tillering, the key carotene isomerase gene ScD27.2 was silenced (via RNAi) and overexpressed (OE) in sugarcane cultivar ‘XTT22’ plantlets. ScD27-RNAi-2 sugarcane exhibited decreased ScD27.2 expression and increased tiller numbers compared to the wild type ‘XTT22’. Conversely, overexpression lines (ScD27-OE-1, ScD27-OE-5, and ScD27-OE-9) showed increased ScD27.2 expression and decreased tiller numbers. ScD27-OE-9 demonstrated notable lateral bud germination, while ScD27-RNAi-2 exhibited reduced drought tolerance. Under normal light and water management conditions, transgenic sugarcane plants showed significant differences in tiller number and plant height. During extended drought conditions, ScD27-RNAi-2 height was significantly reduced compared to wild type ‘XTT22’ and ScD27-OE-9, manifesting a dwarf, multi-tiller phenotype. Additionally, ScD27-RNAi-2 showed significantly reduced SLs content. These findings demonstrate that ScD27.2 regulates tillering under drought stress, likely through SL biosynthesis, and that its drought response may be mediated by the transcription factor ScMYB44.

Key words: DWARF27 , carotene isomerase , drought stress response , strigolactone biosynthesis , tillering

Zhuandi Wu, Xin Hu, Wenzhi Wang, Zhengying Luo, Naveed ur Rehman, Peifang Zhao, Jiayong Liu, Shuzhen Zhang, Fenggang Zan, Xinlong Liu, Jiawen Guo. 甘蔗分蘖与生长发育过程中ScD27.2基因的调控机制[J]. Journal of Integrative Agriculture, 2026, 25(2): 694-708.

Zhuandi Wu, Xin Hu, Wenzhi Wang, Zhengying Luo, Naveed ur Rehman, Peifang Zhao, Jiayong Liu, Shuzhen Zhang, Fenggang Zan, Xinlong Liu, Jiawen Guo. ScD27.2 gene regulation mechanism during sugarcane tillering and growth[J]. Journal of Integrative Agriculture, 2026, 25(2): 694-708.

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甘蔗分蘖与生长发育过程中ScD27.2基因的调控机制

ScD27.2 gene regulation mechanism during sugarcane tillering and growth

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