Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (10): 69-78.doi: 10.11924/j.issn.1000-6850.casb18120105

• Research article • Previous Articles     Next Articles

Comparis on In Vitro Culture of Mature Embryos of Nelumbo from Eight Provenances Worldwide

Mi Qin1,2,3(), Fengluan Liu2,3, Qingqing Liu2,3, Jianguo Cao1, Yuchu Chen4, Daike Tian2,3()   

  1. (1)College of Life Sciences, Shanghai Normal University, Shanghai 200234
    (2)Shanghai Chenshan Botanical Garden/ Shanghai Chenshan Plant Science Research Center of Chinese Academy of Sciences, Shanghai, 201602
    (3)Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai 201602
    (4)Zhejiang Humanities Landscape Co., Ltd./ Hangzhou Tianjing Aquatic Botanical Garden, Hangzhou 310000
  • Received:2018-12-25 Revised:2019-02-19 Online:2020-04-05 Published:2020-03-19

Abstract:

Establishing a feasible disinfection system for obtaining the germfree mature lotus (Nelumbo) embryos as explants and understanding the differences of in vitro growth of lotus from different provenances is the basis for material selection and evaluation method to construct an efficient in vitro culture and genetic transformation system. Plant preservative mixture (PPM) at different concentrations was used in the pre-culture stage to develop a suitable disinfection system of lotus seeds and a method of acquiring the germ-free lotus embryos. Through this sterilization approach, the in vitro cultured seedlings of lotus from 9 worldwide provenances were successfully obtained. Based on the morphological indexes at different culture periods, the membership function method was used to evaluate the growth differences under the in vitro culture conditions. The results showed that the ideal disinfection system for lotus seeds was 75% alcohol 30 s + 2% PPM 2 h + 0.05% PPM 3-5 d soaking during germination. The in vitro growth differences of the seedlings from the tested lotuses of 8 provenances were mainly observed in the later culture stage, such as the number of leaves, the length and thickness of rhizomes, the number of roots and lateral shoots. The seedlings of lotus from Vietnam and Thailand had the highest growth potential and higher reproduction rate under the same culture conditions. The pre-culture method by soaking lotus seeds with PPM to successfully obtain germ-free lotus embryos has solved the technique problem in disinfecting lotus seeds in the past. The in vitro clones of lotus embryos from the tropical or subtropical regions in both Vietnam and Thailand have stronger growth capacity and therefore are the materials more ideal for establishing regeneration and genetic transformation system of Nelumbo.

Key words: Nelumbo, wild type lotus, lotus embryo, sterilization, plant preservative mixture, in vitro culture, membership function

CLC Number: