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Aβ-Carotene Ketolase Gene NfcrtO from Subaerial Cyanobacteria Confers Drought Tolerance in Rice
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作者 GAO Ningning YE Shuifeng +7 位作者 ZHANG Yu ZHOU Liguo MA Xiaosong YU Hanxi LI Tianfei HAN Jing LIU Zaochang LUO Lijun 《Rice science》 SCIE CSCD 2024年第1期62-76,共15页
Nostoc flagelliforme is a terrestrial cyanobacterium that can resist many types of stressors,including drought,ultraviolet radiation,and extreme temperatures.In this study,we identified the drought tolerance gene Nfcr... Nostoc flagelliforme is a terrestrial cyanobacterium that can resist many types of stressors,including drought,ultraviolet radiation,and extreme temperatures.In this study,we identified the drought tolerance gene NfcrtO,which encodes aβ-carotene ketolase,through screening the transcriptome of N.flagelliforme under water loss stress.Prokaryotic expression of NfcrtO under 0.6 mol/L sorbitol or under 0.3 mol/L NaCl stress significantly increased the growth rate of Escherichia coli.When NfcrtO was heterologously expressed in rice,the seedling height and root length of NfcrtO-overexpressing rice plants were significantly higher than those of the wild type(WT)plants grown on½Murashige and Skoog solid medium with 120 mmol/L mannitol at the seedling stage.Transcriptome analysis revealed that NfcrtO was involved in osmotic stress,antioxidant,and other stress-related pathways.Additionally,the survival rate of the NfcrtO-overexpression lines was significantly higher than that of the WT line under both hydroponic stress(24%PEG and 100 mmol/L H_(2)O_(2))and soil drought treatment at the seedling stage.Physiological traits,including the activity levels of superoxide dismutase,peroxidase,catalase,total antioxidant capacity,and the contents of proline,trehalose,and soluble sugar,were significantly improved in the NfcrtO-overexpression lines relative to those in the WT line under 20%PEG treatment.Furthermore,when water was withheld at the booting stage,the grain yield per plant of NfcrtO-overexpression lines was significantly higher than that of the WT line.Yeast two-hybrid analysis identified interactions between NfcrtO and Dna J protein,E3 ubiquitin-protein ligase,and pyrophosphate-energized vacuolar membrane proton pump.Thus,heterologous expression of NfcrtO in rice could significantly improve the tolerance of rice to osmotic stress,potentially facilitating the development of new rice varieties. 展开更多
关键词 antioxidant enzyme β-carotene ketolase drought resistance Nostoc flagelliforme osmotic stress RICE transcriptome analysis
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In vivo protective effect of late embryogenesis abundant protein(ApSK3 dehydrin)on Agapanthus praecox to promote post-cryopreservation survival
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作者 TINGTING HUANG SHAN DENG +1 位作者 JIANGYUAN SHENG DI ZHANG 《BIOCELL》 SCIE 2022年第11期2507-2515,共9页
Dehydrins(DHNs),as members of the late embryogenesis abundant protein family,play critical roles in the protection of seeds from dehydration and plant adaptation to multiple abiotic stresses.Vitrification is a basic m... Dehydrins(DHNs),as members of the late embryogenesis abundant protein family,play critical roles in the protection of seeds from dehydration and plant adaptation to multiple abiotic stresses.Vitrification is a basic method in plant cryopreservation and is characterized by forming a glassy state to prevent lethal ice crystals produced during cryogenic storage.In this study,ApSK3 type DHN was genetically transformed into embryogenic calluses(EC)of Agapanthus praecox by overexpression(OE)and RNA interference(RNAi)techniques to evaluate the in vivo protective effect of DHNs during cryopreservation.The cell viability showed a completely opposite trend in OE and RNAi cell lines,the cell relative death ratio was decreased by 20.0%in ApSK3-OE EC and significantly increased by 66.15%in ApSK3-RNAi cells after cryopreservation.Overexpression of ApSK3 increased the content of non-enzymatic antioxidants(AsA and GSH)and up-regulated the expression of CAT,SOD,POD,and GPX genes,while ApSK3-RNAi cells decreased antioxidant enzyme activities and FeSOD,POD,and APX genes expression during cryopreservation.These findings suggest that ApSK3 affects ROS metabolism through chelating metal ions(Cu^(2+)and Fe^(3+)),alleviates H_(2)O_(2)and OH·excessive generation,activates the antioxidant system,and improves cellular REDOX balance and membrane lipid peroxidation damage of plant cells during cryopreservation.DHNs can effectively improve cell stress tolerance and have great potential for in vivo or in vitro applications in plant cryopreservation. 展开更多
关键词 DEHYDRIN Embryogenic callus CRYOPRESERVATION RNAI Gene overexpression
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The AaBBX21–AaHY5 module mediates light-regulated artemisinin biosynthesis in Artemisia annua L.
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作者 Weizhi He Hang Liu +9 位作者 Zhangkuanyu Wu Qing Miao Xinyi Hu Xin Yan Hangyu Wen Yaojie Zhang Xueqing Fu Li Ren Kexuan Tang Ling Li 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2024年第8期1735-1751,共17页
The sesquiterpene lactone artemisinin is an important anti-malarial component produced by the glandular secretory trichomes of sweet wormwood(Artemisia annua L.).Light was previously shown to promote artemisinin produ... The sesquiterpene lactone artemisinin is an important anti-malarial component produced by the glandular secretory trichomes of sweet wormwood(Artemisia annua L.).Light was previously shown to promote artemisinin production,but the underlying regulatory mechanism remains elusive.In this study,we demonstrate that ELONGATED HYPOCOTYL5(HY5),a central transcription factor in the light signaling pathway,cannot promote artemisinin biosynthesis on its own,as the binding of AaHY5 to the promoters of artemisinin biosynthetic genes failed to activate their transcription.Transcriptome analysis and yeast two-hybrid screening revealed the B-box transcription factor AaBBX21 as a potential interactor with AaHY5.AaBBX21 showed a trichome-specific expression pattern.Additionally,the AaBBX21–AaHY5 complex cooperatively activated transcription from the promoters of the downstream genes AaGSW1,AaMYB108,and AaORA,encoding positive regulators of artemisinin biosynthesis.Moreover,AaHY5 and AaBBX21 physically interacted with the A.annua E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC 1(COP1).In the dark,AaCOP1 decreased the accumulation of AaHY5 and AaBBX21 and repressed the activation of genes downstream of the AaHY5–AaBBX21 complex,explaining the enhanced production of artemisinin upon light exposure.Our study provides insights into the central regulatory mechanism by which light governs terpenoid biosynthesis in the plant kingdom. 展开更多
关键词 AaBBX21 AaHY5 AaCOP1 Artemisia annua L. artemisinin biosynthesis LIGHT
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Fluorescence analysis of antibiotics and antibiotic-resistance genes in the environment: A mini review
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作者 Yuxin Li Chengbin Liu +1 位作者 Qiuju Li Shun Mao 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第10期82-91,共10页
Antibiotics,as widely used antibacterial drug,exist in various environmental media.Antibiotic residues can affect biological metabolism and lead to bacterial resistance and the formation of antibiotic-resistance genes... Antibiotics,as widely used antibacterial drug,exist in various environmental media.Antibiotic residues can affect biological metabolism and lead to bacterial resistance and the formation of antibiotic-resistance genes,posing a threat to human health and ecological safety.Establishing efficient detection methods for antibiotics and antibiotic-resistance genes has great environmental significance.Fluorescence detection methods,due to their fast response,high sensitivity and specificity,and low-cost,are widely used in chemical and biological sensing.This review first summarizes the pre-treatment methods for different types of environmental samples,and then focuses on the recent advances of fluorescence methods for the detection of antibiotics and antibiotic-resistance genes.Finally,main challenges and future research directions of fluorescence methods for antibiotic and antibiotic-resistance genes detection are discussed.This review highlights the promising prospect of fluorescence methods in-situ detection and monitoring of antibiotics and antibiotic-resistance genes,and provides guidance for the construction of overall risk assessment system of environmental media. 展开更多
关键词 ANTIBIOTICS Antibiotic-resistancegenes Fluorescence detection Environmental samples In-situdetection
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A high-efficiency pretreatment method for elution of pathogenic bacteria in lettuce
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作者 Xiaoyan Liao Chunmin Pu +3 位作者 Yan Cui Yalong Bai Xianming Shi Lili Chen 《Food Quality and Safety》 SCIE CSCD 2022年第4期588-596,共9页
Many current studies on rapid detection of pathogenic bacteria in foods have focused on the construction of detection methods,neglecting pretreatment.It is also a key step to efficiently elute pathogenic bacteria from... Many current studies on rapid detection of pathogenic bacteria in foods have focused on the construction of detection methods,neglecting pretreatment.It is also a key step to efficiently elute pathogenic bacteria from food samples for rapid detection and can even determine the success or failure of an assay.In this study,we used Escherichia coli(E.coli),Salmonella enteritidis(S.enteritidis),and Listeria monocytogenes(L.monocytogenes)as model bacteria to compare the elution efficiency of different eluants;explore the effect of surfactant,ionic strength,protein(or amino acid and peptide),and enzyme on the recovery rate of bacteria in lettuce;and compare the compound effect caused by multiple factors.Finally,we developed an efficient bacterial recovery method and confirmed the superiority of this method to analyze the bacterial diversity of eluants from lettuce.The results showed that the recovery efficiency of E.coli,S.enteritidis,and L.monocytogenes,which were artificially contaminated with approximately 10^(5)CFU/g in lettuces,could reach 94.4%,90.6%,and 93.7%by using 10 mmol/L Tris·HCl(pH 9.5)with 0.1%peptone and 300 U/100 mL of cellulase,and furthermore,the elution efficiency could reach 99.6%,98.6%,and 100%with the aid of a 2-min stomaching.For the lettuce samples with only native bacteria,the recovery rate reached 92.1%for viable aerobic bacteria by this method,which was approximately 10%higher than that of the modified previous method.The bacterial diversity of the eluted solution was analyzed,and the result was significantly improved.Considering these advantages,it is important to improve the elution efficiency to achieve rapid and accurate detection of pathogenic bacteria in lettuces. 展开更多
关键词 LETTUCE foodborne pathogens ELUTION PRETREATMENT diversity analysis
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