生物技术通报 ›› 2026, Vol. 42 ›› Issue (6): 149-163.doi: 10.13560/j.cnki.biotech.bull.1985.2025-0985

• 综述与专论 • 上一篇    

植物避荫综合征的分子机制与育种应用:从光信号感知到作物改良

张丽1,2,3(), 张玉1,3, 刘斌4, 聂峰杰1,3, 巩檑5, 何泽学1,3, 罗莉洁1, 刘丽丽1, 司怀军2,6()   

  1. 1.宁夏农林科学院农业生物技术研究中心,银川 750002
    2.甘肃农业大学农学院,兰州 730070
    3.植物生物育种宁夏重点实验室,银川 750002
    4.中国农业科学院作物科学研究所,北京 100081
    5.宁夏农林科学院固原分院,固原 756000
    6.甘肃农业大学干旱生境作物学 国家重点实验室,兰州 730070
  • 收稿日期:2025-09-13 出版日期:2026-06-26 发布日期:2026-07-11
  • 通讯作者: 司怀军,男,博士,教授,研究方向 :马铃薯遗传育种;E-mail: hjsi@gsau.edu.cn
  • 作者简介:张丽,女,硕士,副研究员,研究方向 :马铃薯生物育种;E-mail: lesley119@163.com
    第一联系人:张玉同为本文第一作者
  • 基金资助:
    国家自然科学基金项目(32260529);宁夏农业科技自主创新专项(DW-X-2023004);宁夏农业科技自主创新专项(NKYG-25-14);宁夏自然科学基金项目(2024AAC03379)

Molecular Mechanisms and Breeding Applications of Plant Shade Avoidance Response: From Light Signal Perception to Crop Improvement

ZHANG Li1,2,3(), ZHANG Yu1,3, LIU Bin4, NIE Feng-jie1,3, GONG Lei5, HE Ze-xue1,3, LUO Li-jie1, LIU Li-li1, SI Huai-jun2,6()   

  1. 1.Research Center of Agricultural Biotechnology, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002
    2.College of Agriculture, Gansu Agricultural University, Lanzhou 730070
    3.Ningxia Key Laboratory of Plant Biobreeding, Yinchuan 750002
    4.Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081
    5.Guyuan Branch of Ningxia Academy of Agriculture and Forestry Sciences, Guyuan 756000
    6.State Key Laboratory of Aridl and Crop Science, Gansu Agricultural University, Lanzhou 730070
  • Received:2025-09-13 Published:2026-06-26 Online:2026-07-11

摘要:

避荫综合征(shade avoidance syndrome, SAS)是植物为了适应竞争性遮荫环境,通过感知红光∶远红光比值(R∶FR)降低及光强减弱等光信号,启动的一系列形态与生理适应性响应。SAS显著影响作物群体的光能利用效率及高密度种植条件下的产量潜力。植物感知环境光质变化主要依赖以光敏色素(phytochromes, PHYs)和隐花色素(cryptochromes, CRYs)为核心的光受体网络。遮荫条件下,这两种主要光受体活性的降低,协同解除了对光敏色素互作因子(phytochrome-interacting factors, PIFs)的抑制,促使其大量积累并激活下游SAS相关基因的转录。作为信号整合的核心枢纽,PIFs一方面正向调控生长素、赤霉素等促生长激素的合成与信号传导,驱动细胞快速伸长;另一方面则拮抗免疫防御信号,体现植物在竞争光照资源时的适应性权衡策略。此外,PIFs还介导SAS与生物钟、碳氮代谢、温度及盐胁迫等信号紧密整合,且调控模块在不同作物中表现出保守性与物种特异性。本文综述了SAS分子机制的研究进展,阐明了PHYs和CRYs感知光质机理,以及PIFs整合激素、表观遗传修饰及生物钟信号的复杂调控网络。重点比较了C3与C4作物在光受体系统演化及信号传导上的差异,深入探讨基于基因组编辑和启动子编辑的耐密植分子育种策略。此外,讨论了SAS调控与碳氮代谢及非生物胁迫响应的平衡机制。未来可借助单细胞多组学技术精准解析SAS信号的时空特异性调控网络,并通过智能设计耐密植的理想株型,为作物高产育种提供坚实的理论指导与技术支撑。

关键词: 避荫综合征, 光敏色素, 光敏色素互作因子, 多环境信号整合, 分子育种

Abstract:

Shade avoidance syndrome (SAS) encompasses a series of morphological and physiological adaptive responses initiated by plants to cope with competitive shade environments. This is triggered by perceiving light signals such as a decreased red to far-red light ratio (R:FR) and reduced light intensity. SAS significantly impacts the light utilization efficiency of crop populations and their yield potential under high-density planting conditions. Plants perceive changes in environmental light quality primarily through a photoreceptor network centered on phytochromes (PHYs) and cryptochromes (CRYs). Under shade, the reduced activity of these two main photoreceptors cooperatively relieve inhibition on phytochrome-interacting factors (PIFs), leading to large PIF accumulation and the activation of downstream SAS-related gene transcription. As the core hub of signal integration, PIFs positively regulate the synthesis and signal transduction of growth-promoting hormones like auxins and gibberellins, driving cell elongation, while simultaneously suppressing defense signaling, reflecting the adaptive trade-off strategies of plants when competing for light resources. Furthermore, PIFs also mediate the close integration of SAS with signals such as circadian rhythm, carbon and nitrogen metabolism, temperature and salt stress, with its regulatory modules exhibiting both conservation and species-specificity across different crops. This review summarizes advances in SAS molecular mechanisms, systematically elucidating how PHYs and CRYs perceive light quality, and the complex regulatory networks where PIFs act as central hubs integrating hormonal, epigenetic, and circadian clock signals. It specifically compares differences in photosensory system evolution and signal transduction between C3 and C4 crops, and thoroughly discusses molecular breeding strategies, including genome and promoter editing. In addition, the review discusses the balance mechanism between SAS regulation, carbon-nitrogen metabolism, and abiotic stress responses. Future research can leverage single-cell multi-omics technologies to precisely dissect the spatiotemporally specific regulatory networks of SAS signals. This will facilitate the intelligent design of dense planting-tolerant ideotypes, providing robust theoretical guidance and technical support for high-yield crop breeding.

Key words: shade avoidance syndrome, phytochromes, phytochrome-interacting factors, multi-environmental signal integration, molecular breeding