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Paclobutrazol Can Enhance the Thermal-Tolerant on Herbaceous Peony (Paeonia lactiflora)

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Abstract

As an excellent ornamental flower, herbaceous peony (Paeonia lactiflora Pall.) was introduced to south region of the Yangtze River with continuous high temperature in summer. However, herbaceous peony is adaptable to cool and dry environment but not adaptable to high temperature in summer. Therefore, how to alleviate the high temperature stress injury to herbaceous peony is an urgent problem to be solved. In this study, the effects of exogenous paclobutrazol (PBZ) on alleviate the high temperature stress injure to herbaceous peony were examined under high temperature stress. The results showed that exogenous PBZ treatment on herbaceous peony under high temperature can reduce the electrolyte leakage rate and the degree of membrane lipid peroxidation, restrain the production of superoxide anion (\({\text{O}}_{2}^{ - }\)) and the hydrogen peroxide (H2O2), and increase the activities of catalase (CAT) and superoxide dismutase (SOD). Additionally, comprised with control, exogenous PBZ could improve the photosynthesis, reduce the damage degree of cell structure. Moreover, PBZ induced high temperature-tolerant related genes expression to different degrees. These results indicated that PBZ decreased the deleterious effect of high temperature stress on herbaceous peony growth by reducing membrane lipid peroxidation, activating photosynthesis, and protecting cell structures. These findings indicate the crucial role of PBZ in high temperature stress mitigation and its potential application for managing high temperatures in herbaceous peony cultivation.

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ACKNOWLEDGMENTS

Thanks to the anonymous reviewers for their constructive and valuable comments. Thanks to the editors for their assistance in refining this article.

Funding

This work was supported by the Natural Science Foundation of China, project no. 32071813; the Jiangsu Agricultural Science and Technology Innovation Foundation of China, project no. CX(19)3124; the Modern Agriculture Industrial Technology System (Flower) in Jiangsu Province, project no. JATS[2020]436; and the Young Talent Support Project of Jiangsu Provincial Association for Science and Technology.

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Authors and Affiliations

  1. College of Horticulture and Plant Protection, Yangzhou University, 225009, Yangzhou, China

    J. S. Meng, M. Li, Z. J. Hao, D. Q. Zhao & J. Tao

  2. Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, 225009, Yangzhou, China

    J. Tao

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  1. J. S. Meng
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Contributions

D.Q. Zhao and J. Tao conceived and designed the study. J.S. Meng and Z.J. Hao collected samples and performed the experiments. J.S. Meng, and M. Li drafted and revised the manuscript.

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Correspondence to J. Tao.

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Conflict of interests. The authors declare that they have no conflicts of interest.

Statement on the welfare of humans or animals. This article does not contain any studies involving humans or animals performed by any of the authors.

Additional information

Abbreviation: PBZ—paclobutrazol; REC—relative electrical conductivity; MDA—malondialdehyde; Pn—net photosynthesis rate; Tr—transpiration rate; Gs—stomatal conduction; Ci—intercellular CO2 concentration; WUE—water utilization efficiency; Fv/Fm—the maximum PSII photochemical efficiency; Y(II)—the actual photosynthetic efficiency of photosystem II; Y(NO)—the quantum yield of non-regulated non-photochemical energy loss; Y(NPQ)—the quantum yield of regulated non-photochemical energy loss; HSP—heat stress protein.

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Meng, J.S., Li, M., Hao, Z.J. et al. Paclobutrazol Can Enhance the Thermal-Tolerant on Herbaceous Peony (Paeonia lactiflora). Russ J Plant Physiol 69, 57 (2022). https://doi.org/10.1134/S1021443722030104

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  • DOI: https://doi.org/10.1134/S1021443722030104

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