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草业学报 ›› 2026, Vol. 35 ›› Issue (10): 156-166.DOI: 10.11686/cyxb2025434

• 研究论文 • 上一篇    

日本结缕草‘Zenith’胚性愈伤组织诱导与继代体系优化

任慈1(), 王艺华1, 马龙龙1, 刘翠玲1, 李洁仪1, 刘超1, 何亮亮1, 陈曙1,2,3()   

  1. 1.华南农业大学林学与风景园林学院,广东 广州 510642
    2.广东省草业工程技术研究中心,广东 广州 510642
    3.华南农业大学中山创新中心,广东 中山 528478
  • 收稿日期:2025-10-21 修回日期:2025-12-15 出版日期:2026-10-20 发布日期:2026-09-09
  • 通讯作者: 陈曙
  • 作者简介:E-mail: shuchen@scau.edu.cn
    任慈(2001-),女,河南郑州人,在读硕士。E-mail: 20232036004@scau.edu.cn
  • 基金资助:
    国家自然科学基金(31601990);广东省基础与应用基础研究基金(2025A1515010836);广东省基础与应用基础研究基金(2023A1515140005);广州市科技计划项目(2024E04J1233)

Optimization of an embryonic callus induction and subculture system for Zoysia japonica cv. ‘Zenith’

Ci REN1(), Yi-hua WANG1, Long-long MA1, Cui-ling LIU1, Jie-yi LI1, Chao LIU1, Liang-liang HE1, Shu CHEN1,2,3()   

  1. 1.College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,China
    2.Guangdong Engineering Research Center for Grassland Science,Guangzhou 510642,China
    3.South China Agricultural University Zhongshan Innovation Center,Zhongshan 528478,China
  • Received:2025-10-21 Revised:2025-12-15 Online:2026-10-20 Published:2026-09-09
  • Contact: Shu CHEN

摘要:

为解决日本结缕草组织培养中存在的胚性愈伤组织诱导率低及继代褐化严重等技术瓶颈,本研究以其种播品种‘Zenith’的成熟种子为外植体,旨在建立一套高效、稳定的植株再生体系。研究以Murashige & Skoog(MS)培养基辅以2 mg·L-1 2,4-二氯苯氧乙酸(2,4-D)和0.2 mg·L-1 6-苄氨基嘌呤(6-BA)作为基础诱导培养基(IM),通过3轮递进式的单因素试验筛选关键调控因子。第1轮初筛发现,5 mg·L-1 维生素B1(VB?)和25 mg·L-1 α-酮戊二酸具有促进效应,但胚性愈伤诱导率最高仅为6.74%。第2轮筛选明确了2 mg·L-1麦草畏(dicamba)是核心调控激素,可将胚性愈伤诱导率显著提升至19.65%。第3轮在“IM+2 mg·L-1麦草畏”的基础上进行优化,证实额外添加25mg·L-1的α-酮戊二酸可使胚性愈伤的诱导效率再提升62.38%。针对继代培养难题,在培养基中添加0.05 mg·L-1脱落酸(ABA)可有效抑制愈伤组织的早熟分化;抗褐化筛选则表明,4 g·L-1聚乙烯吡咯烷酮(PVP)、0.5~1.0 g·L-1活性炭(AC)以及0.001~0.005 g·L-1硝酸银(AgNO3)均能显著降低愈伤褐化率,其中PVP的效果最佳。本研究最终建立了一套完整的日本结缕草高效再生体系,为基因编辑、遗传转化等分子育种工作提供了稳定的受体系统,同时为其他暖季型草坪草的再生体系构建提供了重要的理论与技术参考。

关键词: 结缕草, 组织培养, 愈伤组织, 再生体系

Abstract:

There are several technical bottlenecks in Zoysia japonica tissue culture, including the low induction rate of embryogenic callus and severe browning during subculture. This study aimed to address these problems to establish an efficient and stable plant regeneration system for Z. japonica. Mature seeds of the seed-propagated cultivar ‘Zenith’ were used as explants. These explants were cultured on basal induction medium (IM) consisting of Murashige & Skoog medium supplemented with 2 mg·L-1 2,4-dichlorophenoxyacetic acid and 0.2 mg·L-1 6-benzylaminopurine. Key regulatory factors were screened through three successive rounds of single-factor experiments. The first round of screening revealed a promoting effect of 5 mg·L-1 vitamin B1 and 25 mg·L-1 α-ketoglutaric acid on embryogenic callus induction, although the maximum embryogenic callus induction rate was only 6.74%. The second round of screening identified dicamba (2 mg·L-1) as a core hormonal regulator that significantly increased the embryogenic callus induction rate to 19.65%. In the third round of screening, the addition of 25 mg·L-1 α-ketoglutaric acid to IM+2 mg·L-1 dicamba further increased the embryogenic callus induction efficiency by 62.38%. The addition of 0.05 mg·L-1 abscisic acid to the medium effectively inhibited premature differentiation of callus during subculturing. Browning was significantly suppressed by the addition of 4 g·L-1 polyvinylpyrrolidone (PVP), 0.5-1.0 g·L-1 activated carbon, or 0.001-0.005 g·L-1 silver nitrate, with PVP demonstrating the strongest inhibitory effect. In summary, a complete, efficient regeneration system was established for Z. japonica. This system provides a reliable source of recipient materials for molecular breeding applications such as gene editing and genetic transformation. The findings of this study provide a valuable theoretical and technical reference for developing regeneration systems for other warm-season turf grasses.

Key words: Zoysia grass, tissue culture, callus, regeneration system