【摘要】 湘楠是中国南方地区的珍贵用材树种，兼具优良材质特性、药用价值及生态价值，但其传统种子育苗方式存在萌发率低、遗传性状不稳定等问题，严重制约了湘楠优良种质资源的高效推广与利用。该研究以湘楠1 a生实生苗为研究对象，经生长调节剂处理后扦插，系统观察湘楠插穗不定根的发生与发育过程。结果表明：1 a生插穗茎内无潜在根原基，其不定根由诱生根原基发育形成。该诱生根原基源于维管形成层附近的次生韧皮部薄壁细胞的分裂与分化，扦插约20 d后，不定根原基发育为初始不定根并突破周皮；愈伤组织主要由皮层薄壁细胞分裂形成，部分细胞分化为厚壁组织，但未观察到根原基的产生。该研究初步阐明了湘楠插穗不定根的起源与发育过程，为优化其无性繁殖技术提供了理论依据。更多还原

【Abstract】 In this study, one-year-old seedlings of Phoebe hunanensis were used as the source of cuttings. After being treated with a combination of growth regulators and propagated by cuttings, the occurrence and development process of adventitious roots in Phoebe hunanensis cuttings were systematically observed. The results show that: There are no latent root primordia in the stems of one-yearold cuttings, and their adventitious roots are developed from induced root primordia. These induced root primordia originate from the division and differentiation of secondary phloem parenchyma cells near the vascular cambium. About 20 days after cutting, the adventitious root primordium develops into an initial adventitious root and breaks through the periderm. Callus is mainly formed by the division of parenchyma cells in the cortex, and some cells differentiate into thick-walled tissue, but the production of root primordia has not been observed. This study clarified the origin and development process of adventitious roots of Phoebe hunanensis cuttings, providing a theoretical basis for optimizing its asexual reproduction technology.更多还原