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Song X, Gao T, Ai M, Gao S. Experimental investigation of freeze injury temperatures in trees and their contributing factors based on electrical impedance spectroscopy. FRONTIERS IN PLANT SCIENCE 2024; 15:1326038. [PMID: 38419778 PMCID: PMC10900768 DOI: 10.3389/fpls.2024.1326038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Accepted: 01/23/2024] [Indexed: 03/02/2024]
Abstract
In trees, injuries resulting from subfreezing temperatures can cause damage to the cellular biofilm system, metabolic functions, and fibrous reticulum, and even cell death. Investigating the occurrence of freezing damage and its contributing factors could help understand the mechanisms underlying freezing injury and prevent the subsequent damage in trees. To achieve this, a laboratory experiment was conducted using cut wood samples from Korean pine (Pinus koraiensis Siebold & Zucc) and Simon poplar (Populus simonii Carr.), and the effects of environmental freezing factors, including freezing temperatures, freezing duration, and cooling rate, on the temperature at which freezing injuries occur were examined using the electrical impedance spectroscopy (EIS) method. The semi-lethal temperature (LT50), as an indicator of freezing injury in wood tissue, was theoretically deduced based on the measured extracellular resistance (r e) using EIS. The contributory factors to changes in LT50 were determined and their relationship was established. The results revealed that all freezing factors exhibited significant effects on electrical impedance characteristics (r e, r i, and τ), significantly influencing the LT50 of the wood. Random forest (RF) and support vector machine (SVM) models were used to assess the contribution of the freezing factors and moisture content (MC). Among the factors examined, freezing duration had the greatest impact on LT50, followed by the MC, whereas the contribution of the cooling rate was minimal. The model accuracies were 0.89 and 0.86 for Korean pine and Simon poplar, respectively. The findings of our study illustrate that the occurrence of freezing injury in trees is primarily influenced by the duration of freezing at specific subzero temperatures. Slow cooling combined with prolonged freezing at low subzero temperatures leads to earlier and more severe freezing damage.
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Affiliation(s)
- Xinyu Song
- College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin, China
| | - Tong Gao
- College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin, China
| | - Mengyao Ai
- College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin, China
| | - Shan Gao
- School of Civil Engineering and Transportation, Northeast Forestry University, Harbin, China
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Zheng H. Devitrification of lyoprotectants: A critical determinant for bacteriophages inactivation in freeze-drying and storage. Food Res Int 2023; 173:113307. [PMID: 37803616 DOI: 10.1016/j.foodres.2023.113307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 07/17/2023] [Accepted: 07/20/2023] [Indexed: 10/08/2023]
Abstract
Bacteriophages as promising natural antibacterial additives are widely used in food processing and storage. Although freeze-drying is an economical and efficient way to preserve phages, so far there is limited data for phage freeze-drying and key factors that inactivate phages during freeze-drying and storage remain unknown. Here we systemically compared different types of saccharides/polyols (dextran 5000, glucose, sucrose, trehalose, mannitol, and xylitol) as lyoprotectants and their potential ratios for phage freeze-drying. The pH and osmotic pressure tolerance of bacteriophages were determined and all lyoprotectant solutions were within the tolerance range of phages. Combined with thermodynamic data, it was found that only completely vitrified formulations (glucose, sucrose, and trehalose) could preserve phages during freeze-drying. Selected freeze-dried phages were further arranged for an accelerated stability study. Most formulations stored at higher temperatures (≥25 ℃) presented devitrification, resulting in a significant drop in phage titer. 10% (w/v) of sucrose was recommended as the best formulation for freeze-dried phage storage with less devitrification and a better fitting coefficient (R2 = 0.9592) to the Arrhenius equation, predictively reaching shelf-time as 1093.3 days at 4 ℃ storage. These findings implied that the devitrification of lyoprotectants was the critical determinant for bacteriophage inactivation both in freeze-drying and storage.
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Affiliation(s)
- Huangliang Zheng
- School of Pharmacy, The Chinese University of Hong Kong, Hong Kong, China.
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Chen SY, Zhao RN, Li Y, Li HP, Xie MH, Liu JF, Yang MF, Wu CX. Cold tolerance strategy and cryoprotectants of Megabruchidius dorsalis in different temperature and time stresses. Front Physiol 2023; 13:1118955. [PMID: 36714316 PMCID: PMC9873968 DOI: 10.3389/fphys.2022.1118955] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 12/30/2022] [Indexed: 01/13/2023] Open
Abstract
The honey locusts (genus Gleditsia) are a genus of high-value trees in Asia. Seed beetle, Megabruchidius dorsalis (Fåhraeus) (Col.: Chrysomelidae: Bruchinae), is a Gleditsia oligophagous pest that causes severe yield reduction. To understand the cold tolerance of M. dorsalis adults, this study investigated its cold tolerance strategy and the influence of low temperatures on its physiology and biochemistry. The low-temperature treatments were divided into three groups: long-term temperature acclimation (Group 1; 15°C, or 20°C, or 25°C, or 28°C [control check, CK] for 10 days), short-term low-temperature exposure (Group 2; 0°C or 4°C for 2 h), and long-term low-temperature induction (Group 3; 0°C or 4°C for 1, 3, or 5 d). The supercooling point (SCP; temperature at which spontaneous nucleation and ice lattice growth begin), freezing point (FP; temperature at which insect fluids freeze), low lethal temperature (LLT; temperature at which all individuals are killed), water, lipid, glycerol, and total sugars contents were measured under different temperature stresses. The results showed that M. dorsalis adults were a freeze-avoidant species. The SCP and LLT at 28°C were -10.62°C and -19.48°C, respectively. The SCP and FP of long-term temperature acclimation (15°C, or 20°C, or 25°C) were significantly lower than that of the control group (28°C). The water content of the long-term low temperature induction (0°C) group was significantly lower than that of the control group. The lipid and glycerol content in the acclimated group at 20°C and 25°C were significantly higher than in the control group. M. dorsalis adults may maintain their biofluids in a supercooled state via cryoprotectant accumulation and cryoprotective dehydration to prevent ice nucleation. This study provides a theoretical basis for future research on overwintering and potential distribution and related prediction of M. dorsalis adults.
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Affiliation(s)
- Si-Yu Chen
- College of Forestry, Guizhou University, Guiyang, Guizhou, China
| | - Ru-Na Zhao
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Scientific Observing and Experiment Station of Crop Pest Guiyang, Ministry of Agriculture, Institute of Entomology, Guizhou University, Guiyang, China
| | - You Li
- Fujian Province Key Laboratory of Plant Virology, Fujian Agriculture and Forestry University, Vector-Borne Virus Research Center, Fuzhou, China
| | - He-Ping Li
- College of Forestry, Guizhou University, Guiyang, Guizhou, China
| | - Ming-Hui Xie
- College of Forestry, Guizhou University, Guiyang, Guizhou, China
| | - Jian-Feng Liu
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Scientific Observing and Experiment Station of Crop Pest Guiyang, Ministry of Agriculture, Institute of Entomology, Guizhou University, Guiyang, China
| | - Mao-Fa Yang
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Scientific Observing and Experiment Station of Crop Pest Guiyang, Ministry of Agriculture, Institute of Entomology, Guizhou University, Guiyang, China,College of Tobacco Science, Guizhou University, Guiyang, China
| | - Cheng-Xu Wu
- College of Forestry, Guizhou University, Guiyang, Guizhou, China,*Correspondence: Cheng-Xu Wu,
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Kuro A, Morimoto N, Hara T, Matsuoka Y, Fukui M, Hihara M, Kusumoto K, Kakudo N. Protection of rat artery grafts from tissue damage by voltage-applied supercooling. Med Mol Morphol 2022; 55:91-99. [DOI: 10.1007/s00795-021-00310-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 12/05/2021] [Indexed: 10/19/2022]
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Schwidetzky R, Kunert AT, Bonn M, Pöschl U, Ramløv H, DeVries AL, Fröhlich-Nowoisky J, Meister K. Inhibition of Bacterial Ice Nucleators Is Not an Intrinsic Property of Antifreeze Proteins. J Phys Chem B 2020; 124:4889-4895. [PMID: 32437152 DOI: 10.1021/acs.jpcb.0c03001] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Cold-adapted organisms use antifreeze proteins (AFPs) or ice-nucleating proteins (INPs) for the survival in freezing habitats. AFPs have been reported to be able to inhibit the activity of INPs, a property that would be of great physiological relevance. The generality of this effect is not understood, and for the few known examples of INP inhibition by AFPs, the molecular mechanisms remain unclear. Here, we report a comprehensive evaluation of the effects of five different AFPs on the activity of bacterial ice nucleators using a high-throughput ice nucleation assay. We find that bacterial INPs are inhibited by certain AFPs, while others show no effect. Thus, the ability to inhibit the activity of INPs is not an intrinsic property of AFPs, and the interactions of INPs and different AFPs proceed through protein-specific rather than universal molecular mechanisms.
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Affiliation(s)
| | - Anna T Kunert
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Ulrich Pöschl
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | | | - Arthur L DeVries
- University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | | | - Konrad Meister
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany.,University of Alaska Southeast, Juneau, Alaska 99801, United States
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