Journal of Zhejiang Agricultural Sciences ›› 2026, Vol. 67 ›› Issue (2): 431-437.DOI: 10.16178/j.issn.0528-9017.20240549

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Establishment of an in vitro leaf regeneration system for Rhododendron molle Nuanyangyang

ZOU Rongxian1(), HU Guowei2, REN Guangbing3, TAO Chubing1, TENG Xinlei1, MENG Yu1, XIAO Zheng1, ZHAO Hongbo1()   

  1. 1.College of Landscape and Architecture,Zhejiang A&F University/Zhejiang Provincial Key Laboratory of Germplasm Innovation and Utilization for Garden Plants/ Key Laboratory of National Forestry and Grassland Administration on Germplasm Innovation and Utilization for Southern Garden Plants,Hangzhou 311300,Zhejiang
    2.Wuchan Zhongda Changle Forest Farm Company,Hangzhou 311100,Zhejiang
    3.Jinan Park Development Service Center,Jinan 250100,Shandong
  • Received:2024-07-08 Online:2026-02-28 Published:2026-03-07

Abstract:

To establish an efficient leaf in vitro regeneration system for Rhododendron molle Nuanyangyang,this study used leaves from sterile plantlets as explants. It systematically compared the effects of three basal media—Woody Plant Medium (WPM),Murashige and Skoog (MS) medium,and 1/2 MS medium,as well as three plant growth regulators—zeatin (ZT),thidiazuron (TDZ),and indole-3-butyric acid (IBA),and leaf placement orientation on adventitious bud induction and proliferation. The effects of different concentrations of IBA and naphthaleneacetic acid (NAA) on root induction were also investigated. The results indicated that WPM was the optimal basal medium for adventitious bud induction. The highest induction rate (77.99%) was achieved with 0.1 mg·L-1 TDZ and 0.2 mg·L-1 IBA,while the highest proliferation coefficient (4.18) was obtained with 4 mg·L-1 ZT and 0.2 mg·L-1 IBA in WPM. The induction rate was higher with abaxial-side inoculation than with adaxial-side inoculation. The most robust shoots were obtained on WPM with 0.5 mg·L-1 ZT and 0.5 mg·L-1 IBA,and the highest rooting rate (98.38%) was achieved on 1/2 WPM containing 0.8 mg·L-1 NAA. This study provides a technical foundation for the rapid propagation and establishment of a genetic transformation system for new cultivars in Rhododendronmolle.

Key words: Rhododendron molle, in vitro leaf, adventitious bud, regeneration

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