Page 59 - 《广西植物》2026年第5期
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5 期 梁思佳等: 棉花 PRR 基因的功能分化与胁迫特异性表达分析 7 9 1
( 1. Academy of Industry Innovation and Developmentꎬ Huanghuai Universityꎬ Zhumadian 463000ꎬ Henanꎬ Chinaꎻ 2. Xinjiang Uygur Autonomous
Region Academy of Agricultural Sciences Biological Breeding Laboratoryꎬ Urumqi 830091ꎬ Chinaꎻ 3. National Key Laboratory of Crop
Genetic Improvementꎬ Hubei Hongshan Laboratoryꎬ Huazhong Agricultural Universityꎬ Wuhan 430070ꎬ China )
Abstract: Pseudo ̄response regulators (PRRs) are key regulators of plant circadian rhythms and flowering timeꎬ with
their functions having been extensively validated across a wide range of plant species. Howeverꎬ the evolutionary
trajectory and biological roles of this gene family in cotton remain poorly understood. To systematically dissect the
evolutionary characteristics and potential functions of the PRR gene family in cottonꎬ this study integrated data from
BLASTPꎬ Pfamꎬ and NCBI databases to perform evolutionary analyses and expression pattern investigations on 32 PRR
genes identified from four cotton species — Gossypium arboreumꎬ G. raimondiiꎬ G. hirsutumꎬ G. barbadense — as well as
the model plant Arabidopsis thaliana. The results were as follows: ( 1) The PRR genes were clustered into three
evolutionarily conserved subclasses (Aꎬ Bꎬ and C)ꎬ whose origin predated the divergence of monocotyledonous and
dicotyledonous plants. All PRR members contained CCT domainꎬ while the majority possessed a dual CCT ̄Response_reg
domain architecture. (2) Significant heterogeneity was observed in the promoter regions of PRR genes among different
cotton speciesꎬ those in Gossypium arboreum were dominated by stress ̄ and light ̄responsive elements (e.g.ꎬ ABREꎬ
ACE)ꎬ whereas promoters in G. hirsutum and G. barbadense had expanded to include elements associated with defense
mechanismsꎬ hormone signalingꎬ and light signal transduction (e.g.ꎬ MYBꎬ G14K). (3) PRR genes exhibited tissue ̄
specific expression patterns and divergent stress response profiles. Specificallyꎬ Ghir_D12G025960 was highly enriched
in fibers and ovulesꎻ Ghir_D11G001640 was induced by cold stress but repressed under salt or drought conditionsꎻ and
Ghir_ D12G025960 displayed a unique expression dynamic of initial inhibition followed by recovery under heat
stress. This study comprehensively characterizes the structural diversityꎬ evolutionary relationshipsꎬ and functional
differentiation of cotton PRR genes in development and stress responses. These findings provide valuable genetic
resources and a theoretical framework for future research on the cotton circadian clock regulatory network and the
genetic improvement of stress tolerance in cotton breeding.
Key words: cottonꎬ PRR genesꎬ stress adaptationꎬ fiber developmentꎬ cotton breeding
生物钟是植物中一种关键的时间调控机制ꎬ 表(Putteril et al.ꎬ 1995ꎻ Zhang L et al.ꎬ 2015ꎻ Jin et
其通过将生物过程与昼夜环境周期同步ꎬ确保关 al.ꎬ 2018ꎻ Yuan et al.ꎬ 2021)ꎮ PRRs 蛋白由 CCT
键发育 事 件 在 时 间 上 的 精 确 性 ( Young & Kayꎬ 结构域(1 段 43~45 个氨基酸的保守序列)所定义ꎬ
2001ꎻ Yuan et al.ꎬ 2021ꎻ Xu et al.ꎬ 2022b)ꎮ 植物 并依据 基 序 组 成 划 分 为 3 个 亚 家 族: COL ( CO ̄
能够将日照长度(光周期) 作为可靠的季节变化信 like)、CMF ( CCT motif family) 与 PRR ( Cockram et
号ꎬ进而调控多个重要生理过程ꎬ包括开花转变、 al.ꎬ 2012)ꎮ 该类蛋白与细菌双组分系统中的响应
块茎形成、形态建成、光合作用、胁迫耐受性及免 调节 因 子 在 序 列 上 具 有 显 著 同 源 性 ( Dunlapꎬ
疫反 应 等ꎬ以 适 应 环 境 变 化 ( Hotta et al.ꎬ 2007ꎻ 1999)ꎮ 在结构上ꎬPRRs 蛋白通常包含 1 个 N 端受
Song et al.ꎬ 2015ꎻ Xu et al.ꎬ 2022aꎻ Yu et al.ꎬ 体 样 结 构 域 ( RLD ) 与 1 个 C 端 CCT 结 构 域
2023)ꎮ 光周期严格调控光周期诱导的开花过程ꎬ (Mizunoꎬ 2005ꎻ Farré & Liuꎬ 2013)ꎮ 除已知在抑
而昼夜节律振荡器则作为解读 24 h 周期信号的核 制光周期开花中发挥作用以外ꎬPRRS 蛋白还参与
心组件(Imaizumiꎬ 2010)ꎮ 调控 多 种 植 物 生 理 过 程 ( Makino et al.ꎬ 2000ꎻ
光周期开花受复杂遗传网络的精密调控ꎬ在该 Mizuno & Nakamichiꎬ 2005)ꎮ
通路中ꎬ光感受器首先感知光信号并将其传递至生 PRR 基因作为昼夜节律振荡器的核心组分ꎬ
物钟ꎬ生物钟随后产生节律性输出以调控下游基因 对植物生长发育具有重要调控作用ꎮ 其在光周期
表达(Salomé & McClungꎬ 2005)ꎮ 在拟南芥等植物 开花调控中的功能在进化上较为保守( Ito et al.ꎬ
中ꎬ 核 心 生 物 钟 组 分 包 含 CCT ( CONSTANS / 2003)ꎬ并与 MYB 类转录因子 LATE ELONGATED
CONSTANS ̄LIKE / TOC1)基因家族成员ꎬ尤以伪响 HYPOCOTYL ( LHY ) 和 CIRCADIAN CLOCK
应调节因子(pseudo ̄response regulatorsꎬPRRs) 为代 ASSOCIATED 1 ( CCA1 ) 形 成 反 馈 调 控 环 路

