Abstract
The frequently occurring browning of plant tissue cultures is a considerable problem in causing economic losses. However, the mechanism that causes browning of plant tissues is still controvesial and technologies to effectively prevent browning of plant tissues are still scarce. In the present work, two callus lines derived from grapevine shoot tips (ST-callus) and fruit flesh (F-callus) were used to investigate the relationship between callus-associated endophytes and callus browning. We observed the transfer of browning effects from grapevine brown calli to normal calli, in a contact cocultivation experiment, then detected the emergence of endophytic bacteria from brown calli when the calli were incubated in a microbial culture medium, and the isolates were identified as genus Bacilus. The inoculation of pure cultured B. sp. strain ST-B1 into normal calli at different concentrations caused gradient callus browning, validating the callus browning-causing (CBC) endophyte. In addition, the moderate inhibition of endophytic bacteria in grapevine calli by culturing the calli in ampicillin-containing media reduced the incidence and severity of callus oxidative browning. The experiments were performed separately on two types of grapevine calli, ST-callus (derived from the tip of grapevine shoots), and F-callus (derived from the pulp of grape berries), and gave similar results. The DNA sequence amplicon approach showed that the CBC endophytic bacteria were found in both the normal and brown calli, which differed greatly in their relative abundances. And compared to the normal calli, brown calli greatly reduced the diversity of bacterial endophytes, while the diversity of fungal endophytes between normal and browning calli showed no obvious difference. The work demonstrated that callus-associated endophytes are involved in causing oxidative browning of plant cells, and suggested technologies to minimize the occurrence of the oxidative browning during plant tissue culture practices.
Key message
The study revealed a mechanism by which the callus-associated endophytes are causations in triggering oxidative browning of plant cells, and the maintanence of endophytic bacterial balance is fundamental to a healthy callus. The work also suggested technologies to minimise the occurrence of browning during plant tissue culture practices.
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Data availability
All data and materials are available in the manuscript; raw data of high throughput sequencing for the grape calli were deposited at NCBI under the Accession Number PRJNA868149.
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Acknowledgements
This work was financially supported by the joint foundation of the Yunnan Provincial Department of Science and Technology and Yunnan University (No. 2019FY003024); the Yunnan provincial key S&T special project (202102AE090042-02-04), and the National Natural Science Foundation of China (NSFC: 32360255; 31560538).
Funding
This work was supported by the joint foundation of the Yunnan Provincial Department of Science and Technology and Yunnan University (No. 2019FY003024); the Yunnan provincial key S&T special project (202102AE090042-02-04), and the National Natural Science Foundation of China (NSFC: 32360255; 31560538).
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M-ZY, S-SZ, X-XP contributed to the study conception and design. Material preparation, data collection and analysis were performed by M-ZY, Y-TW, C-XC, PZ, C-XL, YW, YL. The first draft of the manuscript was written by M-ZY, X-XP, Y-TW, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Wang, YT., Chen, CX., Zhou, P. et al. Maintenance of callus-associated endophyte balance to mitigate oxidative browning in plant tissue culture practices. Plant Cell Tiss Organ Cult 157, 41 (2024). https://doi.org/10.1007/s11240-023-02669-2
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DOI: https://doi.org/10.1007/s11240-023-02669-2