Page 120 - 《广西植物》2026年第7期
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1 2 1 6                                广  西  植  物                                         46 卷
             ( 1. School of Ecology and Environmentalꎬ Yunnan Universityꎬ Kunming 650091ꎬ Chinaꎻ 2. Yunnan Key Laboratory of Forest Ecosystem Stability
             and Global Change Responseꎬ Xishuangbanna Tropical Botanical Gardenꎬ Chinese Academy of Sciencesꎬ Mengla 666303ꎬ Yunnanꎬ Chinaꎻ 3. College
              of Biology and Chemistryꎬ Pu’er Universityꎬ Puer 665000ꎬ Yunnanꎬ Chinaꎻ 4. College of Forestryꎬ Southwest Forestry Universityꎬ Kunming
               650224ꎬ Chinaꎻ 5. College of Tropical Cropsꎬ Yunnan Agricultural Universityꎬ Kunming 650500ꎬ Chinaꎻ 6. Yuanjiang Savanna Ecological
                       Stationꎬ Xishuangbanna Tropical Botanical Gardenꎬ Chinese Academy of Sciencesꎬ Yuxi 653300ꎬ Yunnanꎬ China )

                 Abstract: Ochroma lagopus is characterized by its fast growthꎬ short life cycleꎬ minimum wood density and uniform
                 material textureꎬ and is widely used in the wind power industry and the aviation industry. Howeverꎬ challenges such as
                 hard seed coatꎬ long seed dormancyꎬ low natural seed germination rateꎬ as well as high seedling variability severely
                 restricted standardized breeding and large ̄scale cultivation. In order to improve the seed germination rateꎬ seedling
                 homogeneityꎬ and to explore its growth characteristicsꎬ this study performed dish germination and pot control
                 experiments to evaluate the effects of varying concentrations of indoleacetic acid (IAA)ꎬ 6 ̄benzyl ademine (6 ̄BA)ꎬ
                 and gibberellin (GA) on seed germination and seedling growth for O. lagopus. The results were as follows: (1) GA
                 promoted seed germination and embryo root root growthꎬ while IAA and 6 ̄BA inhibited seed germinationꎬ the biomass
                 and length of embryo shoot and embryo root ( P< 0.05)ꎬ and the inhibitory effect increased with the increasing of
                 concentration. (2) On the contraryꎬ GAꎬ IAA and 6 ̄BA boosted the growth of seedlingsꎬ and the promoting effect on
                 ground diameter was greater than that on the height and root lengthꎬ and the effect became more significant with the
                 increasing concentration ( P< 0.05). (3) In additionꎬ GA and IAA also significantly increased the below ̄ground
                 biomass accumulation and root ̄shoot ratio of seedlings ( P < 0.01). This study reveled that GA enhanced seed
                 germination by breaking seed dormancyꎬ while GAꎬ IAA and 6 ̄BA not only facilitated the performance of seedlingsꎬ
                 but also increased the root ̄shoot ratioꎬ ultimately accelerating their water absorption capacity and drought
                 resistance. These findings provide a theoretical basis and a practical reference for the seedling raising technology and
                 cultivation management of O. lagopus.
                 Key words: Ochroma lagopusꎬ plant hormoneꎬ fast ̄growing speciesꎬ introduction and cultivationꎬ seedling raising
                 techniquesꎬ root ̄shoot ratio




                种子萌发和幼苗建成在植物更新过程中扮演                            栽培(朱光斌ꎬ1965ꎻ成统等ꎬ2023)ꎮ 因此ꎬ研究植
            极其重要的角色ꎬ是植物生活史中最为敏感且关                              物外源激素对轻木种子萌发和幼苗生长的影响ꎬ
            键的阶段ꎬ不仅受到水分、温度、氧气和光等外界                             具有重要的现实意义和应用价值ꎮ
            环境因子的影响ꎬ还受到植物内源激素的精细调                                  大量 研 究 表 明ꎬ 植 物 生 长 调 节 剂 吲 哚 乙 酸
            控(赵高卷等ꎬ2016ꎻ玉苏甫阿不力提甫和曾雪                          (indoleacetic acidꎬIAA)、赤霉素( gibberellinꎬGA)
            玲ꎬ2023)ꎮ 植物内源激素是指植物自身合成的对                          和 6 ̄苄腺嘌呤(6 ̄benzyl ademineꎬ6 ̄BA) 均有促进

            植物生长或发育有调控作用的有机物质(Ahmad et                         种子萌发、细胞分裂和茎秆生长的功能( Chen &
            al.ꎬ 2025ꎻSun et al.ꎬ 2025)ꎮ 根据植物内源激素              Changꎬ1972ꎻ熊宁旺等ꎬ2024ꎻSajeev et al.ꎬ 2024)ꎮ
            的化学结构ꎬ目前利用人工合成的相似物质被称                              其中ꎬ吲哚乙酸( 亦称生长素)ꎬ能够促进植物枝
            为植物外源激素或植物生长调节剂ꎬ广泛应用于                              条、芽和幼苗顶端芽的形成( 陈文龙等ꎬ2019)ꎮ 赤
            农业生产中ꎬ用以打破种子休眠、促进农作物增                              霉素主要分布在幼根、叶片和嫩叶中ꎬ能够调控种

            产、优化品质和提高抗逆性等方面( 马秀杰ꎬ2011ꎻ                         子休眠ꎬ加速种子发芽及茎秆伸长( 何军等ꎬ2013ꎻ
            蔡鑫等ꎬ2024)ꎮ 轻木( Ochroma lagopus) 作为一种               Huang et al.ꎬ 2019)ꎮ 此外ꎬ赤霉素还能在干旱条
            重要的热带经济树种ꎬ具备生长快、生命周期短及                             件下提升种子体内的丝氨酸、色氨酸及游离脯氨
            木材密度最低等优良特性 (Fletcherꎬ1951ꎻDa Silva &              酸等的含量ꎬ以缓解干旱对种子萌发及幼苗生长
            Kyriakidesꎬ2007)ꎮ 然而ꎬ轻木种子存在种皮坚硬、                   的负面效应(陈志飞ꎬ2016)ꎮ 6 ̄苄腺嘌呤( 又名细
            休眠期长、自然萌发率低和幼苗变异性大等问题ꎬ                             胞分裂素)ꎬ主要在植物根部产生和合成ꎬ是一类
            这些难题长期制约着轻木的标准化育苗和规模化                              促进胞质分裂、组织分化、细胞生长和发育的植物
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