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Investigating the relationships between callus browning in Isatis indigotica Fortune, total phenol content, and PPO and POD activities

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Abstract

Browning, as the most important problem to be solved in callus differentiation, occupies an important position in tissue culture. In this study, plant regeneration was induced using leaves from germinated Isatis indigotica Fortune seedlings and mature plants as explants. Activated carbon (AC) and a solidification agent (Phytagel) were added simultaneously to inhibit browning. We measured the total phenol content and the PPO and POD activities in callus-induced seedling leaves and mature plant leaves of different ploidy at various stages. The results demonstrated that single plant growth regulators could induce calli with higher rooting and browning rates. Despite the addition of AC and phytagel to the medium, half of the mature plant calli turned yellow and eventually died. The total phenol content and POD activity in calli from mature leaves showed significant differences within 0–4 weeks (P < 0.05) but were still higher than the biochemical parameters in calli induced from seedlings, while the PPO activity did not differ significantly (P > 0.05). Mature materials of different ploidy yielded similar results. The addition of 2 mg·L−1 BAP, 0.1 mg·L−1 NAA, and 1.5 mg·L−1 AC and solidification with 0.2% phytagel in MS medium resulted in the highest callus regeneration rate and the lowest browning rate. During dedifferentiation, the browning of the two may be associated with PPO activity and total phenol content.

Key message

The regeneration system of Isatis indigotica Fortune was optimized and the browning problem was solved. The browning of callus is related to PPO activity and the total phenol content.

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Data Availability

The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.

Abbreviations

Isatis indigotica Fortune:

I. indigotica

BAP:

6-benzylaminopurine

NAA:

1-naphthylacetic acid

2,4-D:

2,4-dichlorophenoxyacetic acid

KT:

Kinetin

MS:

Murashige and skoog

CIM:

Callus induction medium

PPO:

Polyphenol oxidase

POD:

Peroxidase

AC:

Activated carbon

ASA:

Ascorbic acid

D:

Day

H:

Hour

Min:

Minute

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Funding

This work was supported by the Jiangsu Modern Agricultural Industrial Technology System Construction Project (JATS|[2022]461, JATS[2022]291).

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Authors and Affiliations

Authors

Contributions

Conceived and designed the experiments: YS, MW, QG. Performed the experiments: YS, MW, QG. Analysed the data: YS, MW, QG, JH, KZ, JH. Wrote the paper: YS, MW, QG, JH, KZ, JH.

Corresponding author

Correspondence to Qiaosheng Guo.

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We thank all authors for their contributions to this work.

Conflict of interest

The authors declare that they have no conflicts of interest.

Additional information

Communicated by Christell van der Vyver.

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Yong Su and Min Wei share co-first authorship.

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Su, Y., Wei, M., Guo, Q. et al. Investigating the relationships between callus browning in Isatis indigotica Fortune, total phenol content, and PPO and POD activities. Plant Cell Tiss Organ Cult 155, 175–182 (2023). https://doi.org/10.1007/s11240-023-02567-7

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  • DOI: https://doi.org/10.1007/s11240-023-02567-7

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