植物研究 ›› 2026, Vol. 46 ›› Issue (3): 434-448.doi: 10.7525/j.issn.1673-5102.2026.03.005
包平安1,2,3, 刘帛鑫1,2,3, 何雅馨1, 付鹏跃1,2,4, 余硕1,2,3, 孙敬爽2,3, 麻文俊2,4, 曲冠证1, 王军辉2,4, 胡瑞阳2,3(
)
收稿日期:2026-01-25
出版日期:2026-05-20
发布日期:2026-05-29
通讯作者:
胡瑞阳
E-mail:hury@caf.ac.cn
作者简介:包平安(2001—),男,硕士研究生,主要从事楸树杂交育种及新品种选育研究。基金资助:
Pingan BAO1,2,3, Boxin LIU1,2,3, Yaxin HE1, Pengyue FU1,2,4, Shuo YU1,2,3, Jingshuang SUN2,3, Wenjun MA2,4, Guanzheng QU1, Junhui WANG2,4, Ruiyang HU2,3(
)
Received:2026-01-25
Online:2026-05-20
Published:2026-05-29
Contact:
Ruiyang HU
E-mail:hury@caf.ac.cn
摘要:
NAC转录因子(NAM,ATAF,and CUC transcription factors)是植物特有的转录调控因子,广泛参与植物的生长发育及非生物胁迫响应过程。为系统解析楸树(Catalpa bungei)NAC基因家族的分子演化特征及其在低温胁迫下的分子调控机制,本研究基于楸树全基因组测序数据,系统鉴定了楸树NAC基因家族成员,并深度剖析了其理化性质、系统发育拓扑结构、基因结构保守性、启动子顺式作用元件分布特征、低温响应的基因表达模式并进行了加权基因共表达网络分析(WGCNA)。结果表明:楸树基因组中共鉴定出65个CbuNAC基因,依据系统发育演化关系可将其划分为4个高度保守的亚家族。染色体定位显示,这些成员非均匀地锚定在16条染色体上,呈现出显著的簇状分布模式。基因结构与保守基序分析表明,同一亚家族成员在内含子/外显子排布及蛋白质Motif组成上表现出高度一致性,这不仅印证了系统发育分类的可靠性,更反映出亚家族内部潜在的功能冗余与进化分化特征。共线性分析证实,片段复制事件是楸树NAC基因家族规模扩张与演化分化的主导力量,而非串联复制。低温胁迫时间序列转录组分析揭示,CbuNAC15、CbuNAC30与CbuNAC36基因在低温胁迫下表达呈显著上调,展现出强烈的且具有时序差异的低温响应特异性。结合WGCNA进一步证实,这3个核心基因不仅协同调控经典的ICE1-CBF抗寒信号通路,还与渗透调节及激素代谢下游效应基因紧密联动。本研究探究了楸树NAC基因家族的基因组学特征,精准锚定了3个极具育种价值的抗寒关键基因,为深入挖掘林木非生物逆境适应性机制及开展分子标记辅助育种提供了坚实的理论支撑与靶标资源。
中图分类号:
包平安, 刘帛鑫, 何雅馨, 付鹏跃, 余硕, 孙敬爽, 麻文俊, 曲冠证, 王军辉, 胡瑞阳. 楸树NAC基因家族鉴定及低温胁迫响应关键基因筛选[J]. 植物研究, 2026, 46(3): 434-448.
Pingan BAO, Boxin LIU, Yaxin HE, Pengyue FU, Shuo YU, Jingshuang SUN, Wenjun MA, Guanzheng QU, Junhui WANG, Ruiyang HU. Identification of NAC Gene Family and Screening of Cold Stress-Responsive Genes in Catalpa bungei[J]. Bulletin of Botanical Research, 2026, 46(3): 434-448.
图4
楸树NAC基因家族顺式作用元件底部为基于CbuNAC蛋白全长氨基酸序列构建的系统发育树;中部热图展示了鉴定出的各顺式作用元件在每个CbuNAC基因启动子区域的数量(count),不同颜色代表不同数量区间(浅蓝色,0~3;深绿色,4~6;橙色,7~9;粉色,10~11;黄色,12~13)。热图左侧将顺式作用元件聚类为4大功能模块:环境响应(Environment,包括光和低温响应)、植物激素(Phytohormone,包括脱落酸、生长素、赤霉素、茉莉酸甲酯、水杨酸和玉米醇溶蛋白代谢调节)、转录因子结合位点(TF,主要为MYB结合位点)及组织特异性表达(Tissue,包括分生组织和胚乳)。顶部百分比堆叠柱状图展示了上述4大类元件的数量在每个CbuNAC基因中所占比例。
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