Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (28): 43-51.doi: 10.11924/j.issn.1000-6850.casb20191000780

Special Issue: 生物技术 园艺

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Establishment of Universal Allium cepa Callus Induction

Yang Haifeng1(), Hui Linchong1, Chen Wei1, Li Weiya1, He Linyu1, Wang Jiangying1, Chen Zhentai1, Miao Meihua1, Pan Meihong1(), Liu Bingjiang2   

  1. 1Lianyungang Academy of Agricultural Sciences, Lianyungang Jiangsu 222000
    2Vegetable and Flower Research Institute of Shandong Academy of Agricultural Sciences, Jinan 250000
  • Received:2019-10-31 Revised:2020-02-23 Online:2020-10-05 Published:2020-09-23
  • Contact: Pan Meihong E-mail:13775492959@163.com;7991454@163.com

Abstract:

The paper aims to study the establishment of onion callus induction system. Callus induction was carried out from onion seedlings, bulbs and young inflorescence, and the callus was subcultured and germinated. The results showed that callus was not induced in 12 accessions of onion seed material, only 12 accessions of the bulbs of onion balls had callus induction by ‘Zaochunhuang3 (sterile line)’; 22 accessions of onion inflorescence had callus induction in dark condition, and the induction rate was 100%. The results showed that there was distinct difference in callus induction from diverse tissues of onion. The induction rate of onion young inflorescence medium was 100%, indicating that it was the best tissue for callus induction of onion. Callus subculture of dissimilar materials showed that ‘Zaochunhuang3 (sterile line)’ and ‘Big Golden Globe’ had the fastest growth of callus; subculture with liquid medium could quickly and efficiently expand the callus. The callus was satisfied to emerge from the medium with 27 gradient combinations. Under light condition, green tissues were formed first, and roots were induced in all the medium, while no seedlings were induced. Paraffin sections showed no difference in explant-induced callus and subculture callus, and root formation was observed after regeneration medium induction, indicating that the medium of separate ingredients could induce onion callus, and the internal hormones promoting rooting increased, leading to the induction of roots. Therefore, the study on the induction and formation of general-purpose onion callus lays a material foundation for the induced emergence and rooting of onion of distinct genotypes, and promotes the application of onion gene editing.

Key words: Allium cepa, young inflorescence, callus, induction, general purpose

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