Abstract
Phytosulfokines (PSK) belong to a new class of peptide growth factors involved in intercellular signaling in plants. In this study, we examined the effect of PSK on cell division and subsequent adventitious shoot formation in protoplast-derived callus culture of Nicotiana benthamiana. Protoplast cultures and protoplast-derived calluses of N. benthamiana were treated with different concentrations of PSK (0, 0.01, 0.03, 0.1, 0.3, and 1 µM). Cell division efficiency was the highest at 32% in the 0.1 µM PSK treatment, which was about two times higher than that of control treatment. PSK concentrations < 0.1 µM were more effective in inducing cell division in the protoplasts than those > 0.3 µM. In contrast, higher concentrations of PSK were more effective in inducing adventitious shoot formation in protoplast-derived calluses. The frequency of adventitious shoot formation was the highest at 8.5% when the calluses were treated with 1 µM PSK. qRT-PCR analysis showed an increase in the expression of genes involved in cell division and differentiation: G1/S specific cyclin (CYCD3-1), cytokinin dependent kinase (CDK), and WUSCHEL (WUS) at 0.1 µM PSK treatment. These results indicate that PSK plays a significant role in promoting cell division and adventitious shoot formation in N. benthamiana. The results obtained in this study could be applied to promote cell division and plant regeneration in protoplast cultures of diverse recalcitrant crop plant species.
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Acknowledgements
This work was supported by the Korea Research Institute of Bioscience and Biotechnology (KRIBB) Research Initiative Program (KGM 5282223) and New Breeding Technologies Development Program (Project No. PJ01653001), Rural Development Administration, Republic of Korea.
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11816_2022_805_MOESM1_ESM.jpg
Supplementary Figure1. Effect of PSK and KCLO3 on cell division from mesophyll protoplasts in protoplast culture medium. In comparison to PSK and KCLO3 combinatory treatment, the frequency of cell division from KCLO3 alone treatment was decreased after 1 week of culture. After 2 weeks of incubation, sustained cell division was observed in KCLO3 alone treatment. Scale bars represent 100 µm (JPG 799 KB)
11816_2022_805_MOESM2_ESM.jpg
Supplementary Figure 2 Effect of PSK on cell division from mesophyll protoplasts in protoplast culture medium in the absence of plant growth regulators. After 1 week of culture, mesophyll protoplasts could not divide in the protoplast culture medium without plant growth regulators. Cell elongation and budding was observed in the 0.1 µM PSK treatment, but cell division did not occur even when the incubation period was increased. Scale bars represent 100 µm (JPG 835 KB)
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Joo, S.J., Choi, S.H., Jie, E.Y. et al. Phytosulfokine promotes cell division in protoplast culture and adventitious shoot formation in protoplast-derived calluses of Nicotiana benthamiana. Plant Biotechnol Rep 16, 633–643 (2022). https://doi.org/10.1007/s11816-022-00805-6
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DOI: https://doi.org/10.1007/s11816-022-00805-6