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Response to temperature stress of reactive oxygen species scavenging enzymes in the cross-tolerance of barley seed germination

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第12期11卷 965-972页

作者： Yu-qin MEI Song-quan SONG Institute of Botany Chinese Academy of Sciences Beijing 100093 China

A number of studies have shown the existence of cross-tolerance in plants, but the physiological mechanism is poorly understood. In this study, we used the germination of barley seeds as a system to investigate the cross-tolerance of low-temperature pretreatment to high-temperature stress and the possible involvement of reactive oxygen species （ROS） scavenging enzymes in the cross-tolerance. After pretreatment at 0 ℃ for different periods of time, barley seeds were germinated at 35 ℃, and the content of malondialdehyde （MDA） and the activities of ROS scavenging enzymes were measured by a spectrophotometer analysis. The results showed that barley seed germinated very poorly at 35 ℃, and this inhibitive effect could be overcome by pretreatment at 0 ℃. The MDA content varied, depending on the temperature at which seeds germinated, while barley seeds pretreated at 0 ℃ did not change the MDA content. Compared with seeds germinated directly at 35 ℃, the seeds pretreated first at 0 ℃ and then germinated at 35 ℃ had markedly increased activities of superoxide dismutase （SOD）, ascorbate peroxidase （APX）, catalase （CAT）, and glutathione reductase （GR）. The SOD and APX activities of seeds germinated at 35 ℃ after 0 ℃-pretreatment were even substantially higher than those at 25 ℃, and GR activity was similar to that at 25 ℃, at which the highest germination performance of barley seeds was achieved. These results indicate that low-temperature pretreatment can markedly increase the tolerance of barley seed to high temperature during germination, this being related to the increase in ROS scavenging enzyme activity. This may provide a new method for increasing seed germination under stress environments, and may be an excellent model system for the study of cross-tolerance.

关键词： Barley seed cross-tolerance Germination/growth Reactive oxygen species (ROS) scavenging enzyme,Pretreatment at low temperature Temperature stress

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The effects of selection for cold tolerance on cross-tolerance to other environmental stressors in Drosophila melanogaster

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Insect Science 2009年第3期16卷 263-276页

作者： Heath A. MacMillan Jillian P. Walsh Brent J. Sinclair Department of Biology The University of Western Ontario London ON N6A 5B7 Canada

cross tolerance, whereby tolerance to one environmental stress is correlated with tolerance to other stressors, is thought to be widespread in insects. We used lines of Drosophila melanogaster Meigen （Diptera： Drosophilidae） selected for survival at a 1-h exposure to -5℃ to examine the extent to which this selection results in increased tolerance to other stresses, including high and low temperatures, desiccation and starvation. While selection improved tolerance to acute cold exposure and survival at -5℃, there was little effect of selection regime on tolerance to other stressors. There was no correlation between tolerances to any of the stressors, suggesting different mechanisms of tolerance. This supports arguments that correlations between stress tolerances during selection experiments with D. melanogaster may be coincidental. The magnitude of heat-hardening was apparently constrained by basal tolerance among lines, but the magnitude of the rapid cold-hardening response was not correlated with basal cold tolerance, implying that the relationship between inducible and basal tolerances differs at high and low temperatures.

关键词： chill coma cold tolerance cross-tolerance desiccation heat shock high temperature laboratory selection longevity rapid cold hardening starvation

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Context-dependent effects of cold stress on behavioral, physiological,and life-history traits of the red flour beetle

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Insect Science 2019年第1期26卷 142-153页

作者： Inon Scharf Keren-Or Wertheimer Joy Lira Xin Tomer Gilad Inna Goldenberg Aziz Subach School of Zoology Faculty of Life Sciences &Steinhardt Museum of Natural HistoryTel Aviv UniversityTel AvivIsrael

Animals are exposed in nature to a variety *** stress is generally harmful,mild stress can also be beneficial and contribute to reproduction and *** studied the effect of five cold shock events versus a single cold shock and a control group, representing three levels of stress (harsh,mild,and no stress),on behavioral,physiological, and life-history traits of the red flour beetle (Tribolium castaneum,Herbst 1797).Beetles exposed to harsh cold stress were less active than a control group:they moved less and failed more frequently to detect a food *** probability to mate was also lower. Beetle pairs exposed to harsh cold stress frequently failed to reproduce at all,and if reproducing,females laid fewer eggs,which were,as larvae in mid-development,smaller than those in the control ***,harsh cold stress led to improved female starvation tolerance,probably due to enhanced lipid *** cold shock also improved tolerance to an additional cold shock compared to the ***,a single cold shock event negatively affected fewer measured response variables than the harsh cold stress, but also enhanced neither starvation tolerance nor tolerance to an additional cold shock. The consequences of a harsher cold stress are thus not solely detrimental but might even enhance survival under stressful *** benign conditions,nevertheless,harsh stress impedes beetle *** harsh stress probably shifted the balance point of the survival-reproduction trade-off,a shift that did not take place following exposure to mild stress.

关键词： chill-coma recovery time cross-tolerance latency to mate maternal effects thermal ecology Tribolium castaneum

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Context-dependent integrated stress resistance promotes a global invasive pest

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Insect Science 2022年第6期29卷 1790-1804页

作者： Vimbai L.Tarusikirwa Ross N.Cuthbert Reyard Mutamiswa Casper Nyamukondiwa Department of Biological Sciences and Biotechnology Botswana International University of Science and TechnologyPalapyeBotswana GEOMAR Helmholtz-Zentrum fur Ozeanforschung Kiel KielGermany School of Biological Sciences Queen's University BelfastNorth ern IrelandUnited Kingdom Department of Zoology and Entomology University of the Free StateBloemfonteinSouth Africa Tugwi-Mukosi Multidisciplinary Research Institute Midlands State UniversityGweruZimbabwe Department of Zoology and Entomology.Rhodes University MakhandaSouth Africa

In nature,insects concurrently face multiple environmental stressors,a sce-nario likely increasing with climate *** stress resistance(ISR)thus often improves fitness and could drive invasiveness,but how physiological mechanisms influ-ence invasion has lacked ***,we investigated cross-tolerance to abiotic stress factors which may influence range limits in the South American tomato pinworm a global invader that is an ecologically and socially damaging crop ***,we tested the effects of prior rapid cold-and heat-hardening(RCH and RHH),fasting,and desiccation on cold and heat tolerance traits,as well as starvation and desiccation sur-vivability between *** life *** effects on critical thermal minima(CT_(min))and maxima(CT_(max))were inconsistent,showing significantly deleterious effects of RCH on adult CT_(max) and CT_(min) and,conversely,beneficial acclimation effects of RCH on larval CT_(min).While no beneficial effects of desiccation acclimation were recorded for desiccation tolerance,fasted individuals had significantly higher survival in adults,whereas fasting negatively affected larval ***,fasted and desiccation acclimated adults had significantly higher starvation tolerance,showing strong evidence for *** results show context-dependent ISR traits that may promote *** fitness and *** the frequent overlapping occurrence of these divergent stressors,ISR reported here may thus partly elucidate the observed rapid global spread of *** into more stressful environments than *** information is vital in determining the underpinnings of multistressor responses,which are fundamental in forecasting species responses to changing environments and management responses.

关键词： acclimation cross-talk cross-tolerance invasive species thermal tolerance tomato leaf miner

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UV-B has larger negative impacts on invasive populations of Triadica sebifera but ozone impacts do not vary

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Journal of Plant Ecology 2016年第1期9卷 61-68页

作者： Hong Wang Xiaochi Ma Ling Zhang Evan Siemann Jianwen Zou College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China Department of Biosciences Rice UniversityHoustonTX 77005USA College of Forestry Jiangxi Agricultural UniversityNanchang 330045China

Aims Abiotic stresses may interact with each other to determine impacts on plants so that their combined impact is less than or more than *** UV-B radiation and surface ozone(O3)are two major components of global change that may have such interactive ***,invasive and native populations of plants may respond differently to stresses as they can vary in primary and secondary *** Here,we conducted a factorial field experiment with open-top chambers assigned to an ozone treatment(ambient,100 ppb,or 150 ppb)and UV-B treatment(ambient or increased 20%).We grew seedlings of native and invasive populations of Triadica sebifera in these chambers for one growing *** Findings Invasive plants grew faster than native plants in ambient UV-B but they did not differ significantly in elevated *** production of invasive plants was especially sensitive to UV-B in a way that increased with UV-B for native plants but decreased for invasive plants which may be important for nutrient *** ambient UV-B,total mass decreased as ozone *** mass was lower with elevated UV-B but there was no additional impact of increasing *** area did not decrease with UV-B so SLA and LAR were lowest at ambient ozone *** results suggest that the effects of ozone will depend on UV-B conditions perhaps due to changes in foliar *** traits that allow invasive populations of plants to be successful invaders may make them especially sensitive to UV-B which may reduce their success in future climatic conditions.

关键词： invasive UV-B O3 cross-tolerance litter

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The central nucleus of amygdala is involved in tolerance to the antinociceptive effect of NSAIDs

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Health 2010年第1期2卷 62-66页

作者： Merab G. Tsagareli Nana Tsiklauri Gulnazi Gurtskaia Ivliane Nozadze Elene Abzianidze Beritashvili Institute of Physiology

Aim: Repeated microinjections of non-opioid an-algesics into the midbrain periaqueductal gray matter and rostral ventro-medial medulla induce antinociception with development of tolerance. Antinociception following systemic administra-tion of non-steroidal anti-inflammatory drugs (N SAIDs) also exhibit tolerance. Presently our aim was to investigate the development of tolerance to the antinociceptive effects of NSAIDs analgine, ketorolac, and xefocam microinjected into cen-tral nucleus of amygdala (Ce) in rats. Methods: Under anesthesia with thiopental a stainless steel guide cannula was stereotaxically implanted uni- laterally or bilaterally into the Ce using stereo-taxic atlas coordinates, and anchored to the cra- nium by dental cement. Five days after surgery, 3 μl of these NSAIDs were injected via the injec-tion cannula while the rat was gently restrained. Twenty min post microinjection, i.e. 10-min be-fore the peak of the drugs’ effect is normally rea- ched, animals were tested with tail flick (TF) and hot plate (HP) tests. On the 5th experimental day all animals received a Ce microinjection of mor-phine. Results: Daily microinjection of NSAIDs into the Ce uni- or bilaterally, produced antino-ciception with development of complete toler-ance over a 5-day period. Following the treat-ment period, morphine microinjection into the Ce failed to elicit antinociception, indicating cro- ss-tolerance to the antinociceptive effect of N SAIDs. In other words, the “non-opioid tolerant” rats showed cross-tolerance to morphine. Con-clusions: Our data confirmed the suggestion that NSAIDs interact with endogenous opioid systems, which likely play a key role in the development of tolerance to the antinociceptive effects of NSA IDs.

关键词： Descending Inhibition Morphine cross-tolerance Nociception

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