A regeneration system using cotyledons and cotyledonary node explants of Toona ciliata  

作　　者：Huiyun Song Wenmai Mao Yuanyuan Shang Wei Zhou Pei Li Xiaoyang Chen 

机构地区：[1]Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm,Guangzhou 510642,People’s Republic of China [2]State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources,Guangzhou 510642,People’s Republic of China [3]College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,People’s Republic of China

出　　处：《Journal of Forestry Research》2021年第3期967-974,共8页林业研究（英文版）

基　　金：This work was fi nancially supported by the National Key Research Projects,Forestry Resource Cultivation and Utilization Technology Innovation(Grant No.2016YFD0600606);the Natural Science Foundation of Guangdong Province of China(Grant No.2018A030313798);Characteristic innovation projects of department of education of Guangdong province(Grant No.2019KTSCX017).

摘　　要：We used the cotyledons and cotyledonary nodes of Toona ciliata(Chinese mahogany)as explants to examine callus and adventitious shoot induction when exposed to different ratios of hormones.We also investigated the effects of seedling age,inoculation method,and genotype on the efficient regeneration of T.ciliata.The results showed that different genotypes exhibited significantly different callus induction efficiency.The cotyledons and cotyledonary nodes of 20-day seedlings inoculated onto MS medium with 0.5 mg/L 6-benzylaminopurine(6-BA),0.5 mg/L kinetin(KT)and 0.05 mg/L 1-naphthylacetic acid(NAA)achieved a greater regeneration rate than did other concentrations of cytokinin and auxin.The numbers of shoots per cotyledon and cotyledonary node explant were 7.33 and 6.67.The optimal inoculation method for cotyledons was that the distal end of the explants was placed in contact with the medium.The optimal adventitious shoot differentiation medium for cotyledon explants was MS medium containing 0.3 mg/L 6-BA and 0.2 mg/L NAA,producing a 3.4 cm height of shoot on average.This study established an efficient regeneration system for T.ciliata with cotyledons and cotyledonary nodes as explants.

关 键 词：COTYLEDONS Cotyledonary nodes Regeneration system Toona ciliata 

分 类 号：S644.4[农业科学—蔬菜学]