在生产实践中，植物生长调节剂可以有效地促进植物插穗不定根的发生，提高插穗的成活率。研究生长调节剂对互叶醉鱼木嫩枝扦插的影响为干旱区生态修复尤其是贺兰山生态修复提供植物资源和丰富园林植物品种，以及为互叶醉鱼木的苗木无性繁育及生产提供参考。选用互叶醉鱼木当年生半木质化嫩枝为试验材料，采用L9(33)正交试验设计，研究了3种生长调节剂吲哚乙酸、吲丁·萘乙酸、生根粉，3种不同浸泡浓度500、1 000、1 500 mg/L以及3个不同浸泡时间10、300、1 800 s对互叶醉鱼木嫩枝扦插生根情况的影响。结果表明，在3种生长调节剂种类中，以吲哚乙酸生根效果最佳，根系效果指数达9.62；生根粉(萘乙酸)处理互叶醉鱼木嫩枝的生根率最高，为68.58%。不同浸泡浓度对互叶醉鱼木嫩枝生根效果均具有显著性差异，当浸泡浓度为1 000 mg/L时，根系效果指数最高，为8.23。不同浸泡时间对互叶醉鱼木嫩枝生根效果有不同程度的影响，但以浸泡时间为300 s的处理互叶醉鱼木嫩枝扦插生根效果最佳，根系效果指数为7.46。在生长调节剂不同种类、不同浸泡浓度、不同浸泡时间的条件下对互叶醉鱼木嫩枝的生根效果进行极差分析表明，影响互叶醉鱼木嫩枝扦插生根效果的主导因子为生长调节剂的种类，而浸泡时间和浸泡浓度则在不同程度上影响着生根效果。综合考虑认为选用浓度为1 000 mg/L的生根粉(萘乙酸)溶液浸泡互叶醉鱼木嫩枝插穗300 s时互叶醉鱼木嫩枝扦插生根效果最佳。

In practical production, plant growth regulators can effectively promote the formation of adventitious roots in cuttings and improve their survival rate. Investigating the effects of growth regulators on young branch cuttings of Buddleja alternifolia provides plant resources for ecological restoration in arid regions, particularly the Helan Mountains, and enriches landscape plant diversity, while also offering reference for the vegetative propagation and seedling production of B. alternifolia. Semi-lignified current-year shoots of B. alternifolia were used as experimental materials, and an L9(33) orthogonal design was employed to examine the effects of 3 growth regulators, indole-3-aceticacid, indole butyric-naphthalene acetic acid, and rooting powder, and 3 soaking concentrations(500, 1 000, 1 500 mg/L) as well as 3 soaking durations(10, 300, 1 800 s) on rooting performance. Results showed that among the 3 types of growth regulators, indole-3-acetic acid produced the best rooting performance, with a root effect index of 9.62, rooting powder(naphthalene acetic acid) resulted in the highest rooting rate of 68.58%. Significant differences were observed among the soaking concentrations, and a concentration of 1 000 mg/L yielded the highest root effect index of 8.23. Soaking time also affected rooting to varying degrees, with the best rooting performance observed at 300 s, yielding a root effect index of 7.46. Range analysis indicated that the dominant factor influencing rooting was the type of growth regulator, while soaking time and concentration had secondary but notable effects. Overall, the optimal rooting performance of B. alternifolia young brance cuttings was achieved when cuttings were soaked in a 1 000 mg/L rooting powder (naphthalene acetic acid) solution for 300 s. |

S687

宁夏回族自治区财政林业新技术引进及推广项目(〔2023〕NX2号)。