中国农业科学 ›› 2026, Vol. 59 ›› Issue (5): 951-966.doi: 10.3864/j.issn.0578-1752.2026.05.003

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

甘蓝型冬油菜越冬期矮生长点形态建成及多激素调控机制

刘海卿1,2(), 金姣姣1,2, 孙万仓3, 柴鹏4, 祁伟亮1,2, 杨刚3, 李婵1, 骆雪梅1, 苏芸芸1,2, 秦雪雪1   

  1. 1 陇东学院农业与生物工程学院,甘肃庆阳 745000
    2 甘肃省陇东生物资源保护利用与生态修复重点实验室,甘肃庆阳 745000
    3 甘肃农业大学农学院,兰州 730070
    4 甘肃省庆阳市西峰区农业技术推广中心,甘肃庆阳 745000
  • 收稿日期:2025-08-19 接受日期:2025-11-12 出版日期:2026-03-01 发布日期:2026-03-06
  • 联系方式: 刘海卿,E-mail:15117162792@163.com
  • 基金资助:
    甘肃省青年科技基金(24JRRM025); 甘肃省农业农村厅种业攻关项目(GYGG-2024-5); 陇东学院青年博士基金(XYBYZK2209); 国家自然科学基金(32360455); 甘肃省高校教师创新基金(甘教技函〔2024〕9号); 甘肃省自然科学基金(22JR5RM205); 庆阳市青年科技人才项目(2025RK1030)

Morphogenesis of the Low-Growth Point and Its Multi-Hormonal Regulatory Mechanism During Overwintering in Winter Rapeseed (Brassica napus L.)

LIU HaiQing1,2(), JIN JiaoJiao1,2, SUN WanCang3, CHAI Peng4, QI WeiLiang1,2, YANG Gang3, LI Chan1, LUO XueMei1, SU YunYun1,2, QIN XueXue1   

  1. 1 School of Agriculture and Bioengineering, Longdong Univerisity, Qingyang 745000, Gansu
    2 Gansu Key Laboratory of Protection and Utilization for Biological Resources and Ecological Restoration, Qingyang 745000, Gansu
    3 College of Agronomy, Gansu Agricultural University, Lanzhou 730070
    4 Xifeng Agricultural Technology Extension Center, Qingyang 745000, Gansu
  • Received:2025-08-19 Accepted:2025-11-12 Published:2026-03-01 Online:2026-03-06

摘要:

【目的】 分析植物激素对生长点形态发育及响应抗寒性的作用及机制,以期为甘蓝型冬油菜品种的选育、扩大甘蓝型冬油菜的种植面积及提高单产提供一定的理论依据。【方法】 以9份不同冬性甘蓝型冬油菜品种为材料,在甘肃庆阳连续2年(2023—2025)田间统计越冬率,11月中旬采样进行根/冠、生长点高度等表型鉴定,并结合显微观察(采用石蜡切片和台盼蓝/NBT染色观察生长锥及细胞死亡、超氧阴离子)鉴定不同品种的抗寒性;选取抗寒性由强到弱差异明显的NTS309、天油14号、秦早1号的生长点组织同步进行LC-MS/MS靶向激素组测定和转录组分析,以PCA、O2PLS整合代谢与转录数据,系统解析生长点高度差异的生理与分子基础。【结果】 不同品种越冬率、根颈直径、干重、根/冠、生长点高度差异明显,强抗寒品种低温胁迫后ROS积累少、死亡细胞少,受低温伤害细胞比例小,反之亦然。其中,越冬率与生长点高度呈极显著负相关(r=-0.972,P<0.001)。越冬率>70%的强抗寒品种(NTS309等)生长点高度较低(约3 cm),生长锥高度仅161.5 μm,而弱抗寒品种(秦早1号等)生长点凸出于地表(约5 cm),生长锥高度约252.9 μm。经激素组和转录组联合分析,生长点高度受生长素(Auxin/IAA)-细胞分裂素(CKs)-赤霉素(GA)-脱落酸(ABA)-茉莉酸(JA)等多维网络调控,强抗寒品种游离IAA、结合态IAA、JA-Ile、GA19、ABA-GE显著上调,而iP9G、mT9G、BAP9G下调;强、弱抗寒品种之间的差异表达基因富集于“色氨酸代谢”“玉米素合成”“植物激素信号转导”“α-亚麻酸代谢”通路;O2PLS模型揭示IAA-Glu、tZR、JA-Ile等代谢物与转录模块高度共变,构成激素-转录因子-代谢物反馈环,抑制细胞伸长、促进分生组织休眠,降低生长锥和生长点高度,防御低温伤害。【结论】 明确了甘蓝型冬油菜“矮生长点”是越冬存活的关键形态标记,其形成由多激素网络精细调控。

关键词: 甘蓝型冬油菜, 植物激素, 生长点, 生长锥, 抗寒性

Abstract:

【Objective】 This study aims to clarify the mechanism of plant hormones on the morphology of growth point and their response to cold resistance of Brassica napus, to provide a theoretical basis for breeding winter Brassica napus varieties, expanding its planting area, and increasing yield per unit.【Method】 Using 9 rapeseed varieties with distinct winter hardiness as experimental materials, a two year (2023-2025) consecutive field identification of overwintering rate was conducted in Qingyang, Gansu Province. Mid-November samplings were used to quantify shoot to root ratio, growth point height and additional phenotypic indicators of overwintering potential. Paraffin sectioning and trypan-blue/nitroblue tetrazolium staining were used to visualize growth cone morphology, cell death, and superoxide accumulation to evaluate the cold tolerance of different cultivars. Growth point of three representative genotypes that span the full range of cold hardiness (NTS309>Tianyou 14>Qinzao 1) were simultaneously analysed by targeted LC-MS/MS targeted phytohormone profiling and RNA-seq. PCA and O2PLS integrative analyses of the metabolome and transcriptome, the physiological and molecular mechanisms underlying the differences in growth point height among these varieties were systematically analyzed.【Result】 The results showed the following: Significant differences were observed among cultivars in overwintering rate, root collar diameter, dry weight, root/shoot ratio, and height of the growing point. Strong cold-tolerant varieties, less reactive oxygen species (ROS) and fewer dead cells observed following cold stress, accompanied by a lower proportion of cells damaged by low temperature, the opposite was true for weak cold-tolerant varieties. Statistical analysis revealed that the overwintering rate was extremely significantly and negatively correlated with growth point height (correlation coefficient r=-0.972, P<0.001). Rapeseed varieties with strong cold-tolerance (e.g., NTS309) which exhibited an overwintering rate exceeding 70%, had a relatively lower growth point height (approximately 3 cm), additionally, the height of the growth cone (observed in paraffin sections) was only 161.5 μm. In contrast, varieties with weak cold-tolerance (e.g., Qinzao 1) had growth points that protruded above the soil surface (approximately 5 cm), and their growth cone measured approximately 252.9 μm in height. Integrated analysis of hormone metabolomics and transcriptomics data revealed that the height of rapeseed growth point is regulated by a multi-dimensional regulatory network involving the phytohormones IAA, CKs, GA, JA and ABA. In strong cold-tolerant varieties, the levels of free IAA, conjugated IAA, JA-Ile, GA19, and ABA-GE were significantly up-regulated, whereas those of iP9G, mT9G, and BAP9G were significantly down-regulated. Differentially expressed genes (DEGs) between strong and weak cold-tolerant varieties were significantly enriched in pathways including “tryptophan metabolism”, “zeatin biosynthesis”, “plant hormone signal transduction”, and “α-linolenic acid metabolism”. The orthogonal partial least squares (O2PLS) model indicated that metabolites including IAA-Glu, tZR, and JA-Ile exhibited strong covariance with transcriptional modules, these interactions collectively form a hormone-transcription factor-metabolite feedback loop, which exerts three key regulatory effects: inhibiting cell elongation, promoting meristem dormancy and reducing the height of growth cone and growth points. Ultimately, this regulatory loop enhances the defense capacity of rapeseed against low-temperature freezing damage.【Conclusion】 This study is the first to confirm that the “dwarf growth point” of rapeseed is a key morphological marker for overwintering survival, and its formation is finely regulated by a multi-hormone network.

Key words: winter rapeseed (Brassica napus L.), plant hormone, growth point, growth cone, cold resistance