• 论文与研究报告 •

### 4种植物生长调节剂对红花玉兰嫩枝扦插生根的影响

1. 1. 北京林业大学省部共建森林培育与保护教育部重点实验室 北京 100083;
2. 五峰博翎红花玉兰科技发展有限公司 宜昌 443400
• 收稿日期:2018-05-18 修回日期:2019-05-22 出版日期:2019-07-25 发布日期:2019-08-16
• 基金资助:
国家林业局林业公益行业科研专项（201504704）；国家林业局林业知识产权转化应用项目（知转2017-11）。

### Effects of Four Plant Growth Regulators on Rooting of the Softwood Cutting of Magnolia wufengensis

Wang Yi1, Jia Zhongkui1, Ma Lüyi1, Deng Shixin1, Zhu Zhonglong2, Sang Ziyang2

1. 1. Key Laboratory for Silviculture and Conservation, Ministry of Education, Beijing Forestry University Beijing 100083;
2. Wufeng Boling Magnolia wufengensis Technology Development Co. Ltd. Yichang 443400
• Received:2018-05-18 Revised:2019-05-22 Online:2019-07-25 Published:2019-08-16

Abstract: [Objective] The aim of this study was to improve the rooting rate of cutting of M. wufengensis, and provide theoretical support and guidance for the rapid propagation, cultivation and promotion of M. wufengensis.[Method] The semi-lignified branches from 5-year-old Magnolia wufengensis seedlings were collected as the propagation materials. A completely randomized block design with two factors, including four types of plant growth regulators of GGR6,NAA,IBA,and IAA, and six concentrations of 200,500,800,1 000,2 000,3 000 mg·L-1,were used. The effects of different types and concentrations of plant growth regulars on rooting parameters of M. wufengensis, i.e. rooting rate, number of adventitious roots, average root length, average root diameter, and root effective traits rate, were investigated. And then the principal component analysis was used to comprehensively evaluate the effects of each treatment combination on rooting.[Result] The results showed that the rooting rate and root morphology of NAA solution treatment was all at a high level among the four plant growth regulators. When the cuttings was soaked in 1 000 mg·L-1 NAA solution, the cutting root had the best quality. The average number of adventitious roots was 13.3, which was 12 more than that of the control group treated with water. The average root length was 14.33 cm, which was about 2.7 times of the control group. The average root diameter was 2.44 mm,which was 0.60 mm thicker than that of the control group. The root effective traits rate was 55.4%, which was 22.1% higher than that of the control group. The rooting rate of NAA 1 000 mg·L-1 treatment was the highest, reaching 53.3%, significantly different from other concentrations, and 16 times higher than that of the control group.[Conclusion] The NAA solution had the better rooting effects than the other three types of growth regulator, and the best concentration of NAA was 1 000 mg·L-1. The research has greatly increased the rooting rate of M. wufengensis, and has provided theoretical basis and technical guidance for the large-scale propagation of germplasm resources of M. wufengensis.