Effect of Plant Preservative MixtureTM on Endophytic Bacteria Eradication from In Vitro-Grown Apple Shoots

Natalya V Romadanova; Arman B Tolegen; Svetlana V Kushnarenko; Elena V Zholdybayeva; Jean Carlos Bettoni

doi:10.3390/plants11192624

Effect of Plant Preservative Mixture^TM on Endophytic Bacteria Eradication from In Vitro-Grown Apple Shoots

Plants (Basel). 2022 Oct 5;11(19):2624. doi: 10.3390/plants11192624.

Authors

Natalya V Romadanova^{1

2}, Arman B Tolegen^{1

2}, Svetlana V Kushnarenko¹, Elena V Zholdybayeva³, Jean Carlos Bettoni⁴

Affiliations

¹ Institute of Plant Biology and Biotechnology, 45 Timiryazev St., Almaty 050040, Kazakhstan.
² Department of Molecular Biology and Genetics, Al-Farabi Kazakh National University, Al-Farabi Av. 71, Almaty 050040, Kazakhstan.
³ National Center for Biotechnology, 13/5 Kurgalzhynskoye Road, Nur-Sultan 010000, Kazakhstan.
⁴ The New Zealand Institute for Plant and Food Research Limited, Batchelar Road, Palmerston North 4410, New Zealand.

Abstract

Endophytic contaminants are a common problem for the in vitro propagation of woody plants and have significant economic repercussions for the conservation of plant genetic resources and commercial micropropagation. In this study, first, the microbial contamination that appeared around the base of in vitro-grown apple shoots was identified as Bacillus megaterium. Then, plant preservative mixture (PPM^TM) was used as a bactericidal agent in plant tissue culture. Its efficacy for eradicating endophytic B. megaterium in in vitro cultures of apple was tested. In vitro-contaminated shoots were grown in tissue culture medium supplemented with 0.2% v/v PPM^TM for 12 weeks and then transferred to medium without any PPM^TM and cultured for 24 weeks. This study showed that PPM^TM is an effective agent for controlling the growth of B. megaterium. Our results highlight the species-specific response of apple shoots to PPM^TM. PPM^TM was effective in controlling endogenous microbial contaminations from apple varieties 'Golden Delicious', 'Landsberger Renette', 'Suislepper', and 'Aport krovavo-krasnyi'; meanwhile, in 'KG 7' and 'Gold Rush', all the plants grown in the absence of PPM^TM were still bacterially contaminated, even though they were pre-treated for 12 weeks in PPM^TM-supplemented medium. These results therefore suggest the essentiality of further testing of extended incubation of PPM^TM in these cultivars that had outbreaks of bacterial contamination.

Keywords: Bacillus megaterium; Malus; PPMTM; biocide; microbial contamination; plant tissue culture.

Abstract

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