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NFXL1 functions as a transcriptional activator required for thermotolerance at reproductive stage in Arabidopsis

Journal of Integrative plant Biology 2024年第1期66卷 54-65页

作者： Qiao‐Yun Zhu Lin‐Lin Zhang Jian‐Xiang Liu state key laboratory of plant environmental resilience College of Life SciencesZhejiang UniversityHangzhou 310027China

plants are highly susceptible to abiotic stresses,particularly heat stress during the reproductive stage.However,the specific molecular mechanisms underlying this sensitivity remain largely unknown.In the current study,we demonstrate that the Nuclear Transcription Factor,X-box Binding Protein 1-Like 1(NFXL1),directly regulates the expression of DEHYDRATION-RESPONSIVE ELEMENT-BINDING PROTEIN 2A(DREB2A),which is crucial for reproductive thermotolerance in Arabidopsis.NFXL1 is upregulated by heat stress,and its mutation leads to a reduction in silique length(seed number)under heat stress conditions.RNA-Seq analysis reveals that NFXL1 has a global impact on the expression of heat stress responsive genes,including DREB2A,Heat Shock Factor A3(HSFA3)and Heat Shock Protein 17.6(HSP17.6)in flower buds.Interestingly,NFXL1 is enriched in the promoter region of DREB2A,but not of either HSFA3 or HSP17.6.Further experiments using electrophoretic mobility shift assay have confirmed that NFXL1 directly binds to the DNA fragment derived from the DREB2A promoter.Moreover,effector-reporter assays have shown that NFXL1 activates the DREB2A promoter.The DREB2A mutants are also heat stress sensitive at the reproductive stage,and DEREB2A is epistatic to NFXL1 in regulating thermotolerance in flower buds.It is known that HSFA3,a direct target of DREB2A,regulates the expression of heat shock proteins genes under heat stress conditions.Thus,our findings establish NFXL1 as a critical upstream regulator of DREB2A in the transcriptional cassette responsible for heat stress responses required for reproductive thermotolerance in Arabidopsis.

关键词： Arabidopsis DREB2A heat stress NFXL1 reproductive thermotolerance

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SCAB1 coordinates sequential Ca^(2+) and ABA signals during osmotic stress induced stomatal closure in Arabidopsis

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Science China(Life Sciences) 2024年第1期67卷 1-18页

作者： Tianren Zhang Li Bai Yan Guo state key laboratory of plant environmental resilience College of Biological SciencesChina Agricultural UniversityBeijing 100193China

Hyperosmotic stress caused by drought is a detrimental threat to plant growth and agricultural productivity due to limited water availability.Stomata are gateways of transpiration and gas exchange,the swift adjustment of stomatal aperture has a strong influence on plant drought resistance.Despite intensive investigations of stomatal closure during drought stress in past decades,little is known about how sequential signals are integrated during complete processes.Here,we discovered that the rapid Ca^(2+) signaling and subsequent abscisic acid(ABA)signaling contribute to the kinetics of both F-actin reorganizations and stomatal closure in Arabidopsis thaliana,while STOMATAL CLOSURE-RELATED ACTIN BINDING PROTEIN1(SCAB1)is the molecular switch for this entire process.During the early stage of osmotic shock responses,swift elevated calcium signaling promotes SCAB1 phosphorylation through calcium sensors CALCIUM DEPENDENT PROTEIN KINASE3(CPK3)and CPK6.The phosphorylation restrained the microfilament binding affinity of SCAB1,which bring about the Factin disassembly and stomatal closure initiation.As the osmotic stress signal continued,both the kinase activity of CPK3 and the phosphorylation level of SCAB1 attenuated significantly.We further found that ABA signaling is indispensable for these attenuations,which presumably contributed to the actin filament reassembly process as well as completion of stomatal closure.Notably,the dynamic changes of SCAB1 phosphorylation status are crucial for the kinetics of stomatal closure.Taken together,our results support a model in which SCAB1 works as a molecular switch,and directs the microfilament rearrangement through integrating the sequentially generated Ca^(2+) and ABA signals during osmotic stress induced stomatal closure.

关键词： calcium signal ABA stomatal movement microfilaments kinase

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Structural insights into the Oryza sativa cation transporters HKTs in salt tolerance

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Journal of Integrative plant Biology 2024年第4期66卷 700-708页

作者： Ran Gao Yutian Jia Xia Xu Peng Fu Jiaqi Zhou Guanghui Yang state key laboratory of plant environmental resilience Frontiers Science Center for Molecular Design BreedingCollege of Biological SciencesChina Agricultural UniversityBeijing 100193China

The high-affinity potassium transporters(HKTs),selectively permeable to either Na^(+)alone or Na^(+)/K^(+),play pivotal roles in maintaining plant Na^(+)/K^(+)homeostasis.Although their involvement in salt tolerance is widely reported,the molecular underpinnings of Oryza sativa HKTs remain elusive.In this study,we elucidate the structures of OsHKT1;1 and OsHKT2;1,representing two distinct classes of rice HKTs.The dimeric assembled OsHKTs can be structurally divided into four domains.At the dimer interface,a half-helix or a loop in the third domain is coordinated by the C-terminal region of the opposite subunit.Additionally,we present the structures of OsHKT1;5 salt-tolerant and salt-sensitive variants,a key quantitative trait locus associated with salt tolerance.The salt-tolerant variant of OsHKT1;5 exhibits enhanced Na^(+)transport capability and displays a more flexible conformation.These findings shed light on the molecular basis of rice HKTs and provide insights into their role in salt tolerance.

关键词： HKT salt-tolerant structure

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Integrative regulatory mechanisms of stomatal movements under changing climate

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Journal of Integrative plant Biology 2024年第3期66卷 368-393页

作者： Jingbo Zhang Xuexue Chen Yajing Song Zhizhong Gong state key laboratory of Nutrient Use and Management College of Resources and Environmental SciencesNational Academy of Agriculture Green DevelopmentChina Agricultural UniversityBeijing 100193China state key laboratory of plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China state key laboratory of plant environmental resilience College of Biological SciencesChina Agricultural UniversityBeijing 100094China Institute of Life Science and Green Development School of Life SciencesHebei UniversityBaoding 071001China

Global climate change-caused drought stress,high temperatures and other extreme weather profoundly impact plant growth and development,restricting sustainable crop production.To cope with various environmental stimuli,plants can optimize the opening and closing of stomata to balance CO_(2)uptake for photosynthesis and water loss from leaves.Guard cells perceive and integrate various signals to adjust stomatal pores through turgor pressure regulation.Molecular mechanisms and signaling networks underlying the stomatal movements in response to environmental stresses have been extensively studied and elucidated.This review focuses on the molecular mechanisms of stomatal movements mediated by abscisic acid,light,CO_(2),reactive oxygen species,pathogens,temperature,and other phytohormones.We discussed the significance of elucidating the integrative mechanisms that regulate stomatal movements in helping design smart crops with enhanced water use efficiency and resilience in a climate-changing world.

关键词： environmental stress guard cell plant regulatory mechanisms stomatal movements

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plant photobiology:From basic theoretical research to crop production

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Journal of Integrative plant Biology 2024年第5期66卷 847-848页

作者： Hongtao Liu Jigang Li College of Life Sciences and Oceanography Shenzhen UniversityShenzhen 518061China state key laboratory of plant environmental resilience College of Biological SciencesChina Agricultural UniversityBeijing 100193China

As one of the most important environmental signals for plants,light plays a profound role in regulating virtually every aspect of plant growth and development.Light signals are perceived by plants via several families of photoreceptors,among which phytochromes are responsible for absorbing the red(R)and far-red(FR)wavelengths(600–750 nm),cryptochromes(CRYs)perceive the blue(B)/ultraviolet-A(UV-A)wavelengths(320–500 nm),and UV RESISTANCE LOCUS 8(UVR8)is a recently-characterized UV-B(280–320 nm)photoreceptor.

关键词： UVR8 photoreceptor development.

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plant virology in the 21st century in China:Recent advances and future directions

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Journal of Integrative plant Biology 2024年第3期66卷 579-622页

作者： Jianguo Wu Yongliang Zhang Fangfang Li Xiaoming Zhang Jian Ye Taiyun Wei Zhenghe Li Xiaorong Tao Feng Cui Xianbing Wang Lili Zhang Fei Yan Shifang Li Yule Liu Dawei Li Xueping Zhou Yi Li state key laboratory for Ecological Pest Control of Fujian and Taiwan Crops Vector-borne Virus Research CenterCollege of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhou 350002China state key laboratory of plant environmental resilience and Ministry of Agriculture key laboratory of Soil Microbiology College of Biological SciencesChina Agricultural UniversityBeijing 100193China state key laboratory for Biology of plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China state key laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China state key laboratory of plant Genomics Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China state key laboratory of Rice Biology Institute of BiotechnologyZhejiang UniversityHangzhou 310058China Department of plant Pathology The Key Laboratory of Plant ImmunityNanjing Agricultural UniversityNanjing 210095China state key laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Institute of Plant VirologyNingbo UniversityNingbo 315211China MOE key laboratory of Bioinformatics Center for Plant BiologySchool of Life SciencesTsinghua UniversityBeijing 100084China state key laboratory of Protein and plant Gene Research School of Life SciencesPeking UniversityBeijing 100871China

plant viruses are a group of intracellular pathogens that persistently threaten global food security.Significant advances in plant virology have been achieved by Chinese scientists over the last 20 years,including basic research and technologies for preventing and controlling plant viral diseases.Here,we review these milestones and advances,including the identification of new crop-infecting viruses,dissection of pathogenic mechanisms of multiple viruses,examination of multilayered interactions among viruses,their host plants,and virus-transmitting arthropod vectors,and in-depth interrogation of plantencoded resistance and susceptibility determinants.Notably,various plant virus-based vectors have also been successfully developed for gene function studies and target gene expression in plants.We also recommend future plant virology studies in China.

关键词： China emerging plant viruses plant virology plant resistance/susceptibility to viral infection plant-virus transmission vector interactions plant virus-based vectors viral pathogenesis

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Staying hungry:a roadmap to harnessing central regulators of symbiotic nitrogen fixation under fluctuating nitrogen availability

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aBIOTECH 2024年第1期5卷 107-113页

作者： Lijin Qiao Jieshun Lin Takuya Suzaki Pengbo Liang state key laboratory of plant environmental resilience College of Biological SciencesChina Agricultural UniversityBeijingChina MOA key laboratory of Soil Microbiology Rhizobium Research CenterChina Agricultural UniversityBeijingChina Department of Molecular Biology and Genetics Aarhus UniversityAarhusDenmark Faculty of Life and environmental Sciences University of TsukubaTsukubaIbarakiJapan Tsukuba plant-Innovation Research Center University of TsukubaTsukubaIbarakiJapan

Legumes have evolved specific inventions to enhance nitrogen(N)acquisition by establishing symbiotic interactions with N-fixing rhizobial bacteria.Because symbiotic N fixation is energetically costly,legumes have developed sophisticated mechanisms to ensure carbon-nitrogen balance,in a variable environment,both locally and at the whole plant level,by monitoring nodule number,nodule development,and nodular nitrogenase activity,as well as controlling nodule senescence.Studies of the autoregulation of nodulation and regulation of nodulation by nodule inception(NIN)and NIN-LIKE PROTEINs(NLPs)have provided great insights into the genetic mechanisms underlying the nitrateinduced regulation of root nodulation for adapting to N availability in the rhizosphere.However,many aspects of N-induced pleiotropic regulation remain to be fully explained,such as N-triggered senescence in mature nodules.Wang et al.determined that this process is governed by a transcriptional network regulated by NAC-type transcription factors.Characterization and dissection of these soybean nitrogenassociated NAPs(SNAPs)transcription factor-mastered networks have yielded a roadmap for exploring how legumes rewire nodule functions across a range of N levels,laying the foundation for enhancing the growth of N-deprived crops in agricultural settings.

关键词： Symbiotic nitrogen fixation N-adapted nodulation Nodule senescence NIN NLPs SNAPs

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New mechanistic insights into phosphate-starvation-regulated plant architecture change and nutrient uptake

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Molecular plant 2024年第1期17卷 19-21页

作者： Hong Lu Rongbin Lin Meiju Deng Kangming Jin Chuanzao Mao state key laboratory of plant environmental resilience College of Life SciencesZhejiang UniversityHangzhou 310058China Hainan Institute of Zhejiang University Yazhou Bay Science and Technology CityYazhou DistrictSanyaHainan 572025China

Phosphorus(P)is an indispensable macro-nutrient for plant growth that is absorbed by plants in the form of inorganic phosphate(Pi).Pi deficiency is a major challenge limiting crop productivity worldwide.To combat Pi scarcity and maintain Pi homeostasis,plants have evolved different strategies for efficient Pi acquisition(Paz-Ares et al.,2022).plants reduce overall growth and enhance the root system to optimize nutrients foraging in Pi-limited soils.Strigolactones(SLs).

关键词： plant maintain inorganic

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Designing salt stress-resilient crops:Current progress and future challenges

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Journal of Integrative plant Biology 2024年第3期66卷 303-329页

作者： Xiaoyan Liang Jianfang Li Yongqing Yang Caifu Jiang Yan Guo state key laboratory of plant environmental resilience College of Biological SciencesChina Agricultural UniversityBeijing 100094China state key laboratory of Nutrient Use and Management College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100194China Center for Crop Functional Genomics and Molecular Breeding China Agricultural UniversityBeijing 100094China Frontiers Science Center for Molecular Design Breeding China Agricultural UniversityBeijing 100193China

Excess soil salinity affects large regions of land and is a major hindrance to crop production worldwide.Therefore,understanding the molecular mechanisms of plant salt tolerance has scientific importance and practical significance.In recent decades,studies have characterized hundreds of genes associated with plant responses to salt stress in different plant species.These studies have substantially advanced our molecular and genetic understanding of salt tolerance in plants and have introduced an era of molecular design breeding of salt-tolerant crops.This review summarizes our current knowledge of plant salt tolerance,emphasizing advances in elucidating the molecular mechanisms of osmotic stress tolerance,salt-ion transport and compartmentalization,oxidative stress tolerance,alkaline stress tolerance,and the trade-off between growth and salt tolerance.We also examine recent advances in understanding natural variation in the salt tolerance of crops and discuss possible strategies and challenges for designing salt stress-resilient crops.We focus on the model plant Arabidopsis(Arabidopsis thaliana)and the four most-studied crops:rice(Oryza sativa),wheat(Triticum aestivum),maize(Zea mays),and soybean(Glycine max).

关键词： molecular design breeding salt stress-resilient crop salt tolerance

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植物响应逆境胁迫过程中的染色质3D结构重塑

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Science Bulletin 2024年第7期69卷 847-849页

作者：张霖霖刘建祥 state key laboratory of plant environmental resilience College of Life SciencesZhejiang UniversityHangzhou 310027China

Being sessile,plants evolve different acclimation strategies at both the transcriptional and post-translational levels to cope with adverse environmental conditions[1].Several recent studies[2–9]have shown that gene expression at transcriptional level under abiotic stress conditions is associated with highly dynamic threedimensional(3D)chromatin reorganization.

关键词： 3D结构 evolve translational

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