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Variations in OsSPL10 confer drought tolerance by directly regulating OsNAC2 expression and ROS production in rice

Journal of Integrative Plant Biology 2023年第4期65卷 918-933页

作者： Yingxiu Li Shichen Han Xingming Sun Najeeb Ullah Khan Qun Zhong Zhanying Zhang Hongliang Zhang Feng Ming Zichao Li Jinjie Li State Key Laboratory of Agrobiotechnology/Beijing Key Laboratory of Crop Genetic Improvement College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Shanghai Key Laboratory of Plant Molecular Sciences College of Life SciencesShanghai Normal UniversityShanghai 200234China Sanya Institute of China Agricultural University Sanya 572025China

Drought is a major factor restricting the production of rice(Oryza sativa L.).The identification of natural variants for drought stress-related genes is an important step toward developing genetically improved rice varieties.Here,we characterized a member of the SQUAMOSA PROMOTER BINDING PROTEIN-LIKE(SPL)family,OsSPL10,as a transcription factor involved in the regulation of drought tolerance in rice.OsSPL10 appears to play a vital role in drought tolerance by controlling reactive oxygen species(ROS)production and stomatal movements.Haplotype and allele frequency analyses of OsSPL10 indicated that most upland rice and improved lowland rice varieties harbor the OsSPL10Hap1allele,whereas the OsSPL10Hap2allele was mainly present in lowland and landrace rice varieties.Importantly,we demonstrated that the varieties with the OsSPL10Hap1allele showed low expression levels of OsSPL10 and its downstream gene,OsNAC2,which decreases the expression of OsAP37 and increases the expression of OsCOX11,thus preventing ROS accumulation and programmed cell death(PCD).Furthermore,the knockdown or knockout of OsSPL10 induced fast stomatal closure and prevented water loss,thereby improving drought tolerance in rice.Based on these observations,we propose that OsSPL10 confers drought tolerance by regulating OsNAC2 expression and that OsSPL10Hap1could be a valuable haplotype for the genetic improvement of drought tolerance in rice.

关键词： drought tolerance haplotype OsNAC2 OsSPL10 ROS

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Qitaihe:City of Olympic Champions

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China News Release 2023年第8期 28-31页

作者： Song shichen han Bingyang 不详

Honored with the title of“City of Olympic Champions”by the Chinese Olympic Committee in June 2022,Qitaihe,a small border town in northeast China’s Heilongjiang Province,has cultivated 12 world champions,including Yang Yang,Wang Meng,Zhang Jie,Sun Linlin,Fan Kexin and Liu Qiuhong,over the past five decades.All these successes are the result of the unwavering efforts from the Qitaihe city government and several generations of coaches and athletes.

关键词： northeast Olympic border

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Expression and regulation of genes involved in the reserve starch biosynthesis pathway in hexaploid wheat (Triticum aestivum L.)

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The Crop Journal 2021年第2期9卷 440-455页

作者： Yunsong Gu Shichen Han Lin Chen Junyi Mu Luning Duan Yaxuan Li Yueming Yan Xiaohui Li Key Laboratory of Genetics and Biotechnology College of Life ScienceCapital Normal UniversityBeijing 100048China

Reserve starch of cereal crop accounts for about 70%of grain endosperm and acts as an important human carbohydrate resource worldwide.Wheat reserve starch is synthesized by enzymatic machinery in endosperm cells.To identify genes involved in starch biosynthesis,we constructed 30 RNA-Seq libraries of 10 endosperm-development periods and performed expression and localization analyses.Of 166 endosperm-expressed homologs of starch biosynthesis-related genes,74 showed expression correlated with reserve starch accumulation,including 26 with expected subcellular distribution and higher expression than their isoforms.The key proteins SUS3,UGP1,cAGPase,and Bt1-3 formed the main metabolic pathway and contributed the major substrates for starch processing in amyloplasts.Important isoforms,key pathway proteins,and the main carbon flux toward starch formation in the reserve starch biosynthesis pathway were identified.Based on a coexpression analysis,a library of 425 transcription factors was produced to screen for common regulators.TaMYB44 had features of transcription factors and bound to TaSUT1,TaSSIIIa,TaBEIIa,TaISA1,and TaBEIIb promoters in yeast,suggesting that the gene is a pathway regulator.This study sheds light on understanding the mechanism of reserve starch biosynthesis and will be helpful for increasing starch content in wheat endosperm via biotechnological strategies.

关键词： Biosynthesis Reserve starch RNA-Seq Subcellular localization Wheat

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Nitrogen addition promotes foliar litterfall and element return in a subtropical forest,southwestern China

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Journal of Forestry Research 2023年第4期34卷 939-948页

作者： Yue Zhang shichen Xiong Chengming You Sining Liu Lixia Wang Li Zhang han Li Bo Tan Yang Liu Zhenfeng Xu Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River&Institute of Ecology and Forestry Sichuan Agricultural UniversityChengdu 611130People’s Republic of China

Nitrogen deposition has a considerable impact on biogeochemical cycling in terrestrial ecosystems.However,how litter production and element return respond to N addition remains poorly understood in nitrogen-rich subtropical regions.In this study,a 4-year nitrogen addition experiment explored its eff ects on foliar litter production and carbon,nitrogen and phosphorus in a subtropical Michelia wilsonii forest.A clear seasonal pattern in foliar litterfall was observed,regardless of nitrogen treatments,with a peak in spring and a smaller one in autumn.Foliar litter increased with increasing nitrogen but did not aff ect litter carbon concentrations and often decreased nitrogen and phosphorous concentrations.The eff ect of nitrogen addition was dependent on time(month/year).Carbon,nitrogen and phosphorous return showed similar bimodal seasonal patterns.Nitrogen addition increased carbon and nitrogen return but did not aff ect phosphorous.Our results suggest that the addition of nitrogen stimulates carbon and nutrient return via litterfall.

关键词： Nitrogen addition Litterfall Seasonal patterns Element return Subtropical forest

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El Ni?o/Southern Oscillation during the 4.2 ka event recorded by growth rates of corals from the North South China Sea

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Acta Oceanologica Sinica 2020年第1期39卷 110-117页

作者： Shaohua Dang Kefu Yu shichen Tao Tao han Huiling Zhang Wei Jiang Guangxi Laboratory on the Study of Coral Reefs in the South China Sea Guangxi UniversityNanning 530004China Coral Reef Research Center of China Guangxi UniversityNanning 530004China School of Marine Sciences Guangxi UniversityNanning 530004China South China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 510301China College of Ocean Engineering Guangdong Ocean UniversityZhanjiang 524088China

The 4.2 ka event that occurred during the period from 4 500–3 900 a BP was characterized by cold and dry climates and resulted in the collapse of civilizations around the world. The cause of this climatic event, however, has been under debate. We collected four corals(Porites lutea) from Yongxing Island, Xisha Islands, South China Sea, dated them with the U-series method, and measured the annual coral growth rates using X-ray technology. The dating results showed that the coral growth ages were from 4 500–3 900 a BP, which coincide well with the period of the4.2 ka event. We then reconstructed annual sea surface temperature anomaly(SSTA) variations based on the coral growth rates. The growth rate-based SSTA results showed that the interdecadal SSTA from 4 500–3 900 a BP was lower than that during modern times(1961–2008 AD). A spectral analysis showed that the SSTA variations from4 500–3 900 a BP were under the influence of El Nino-Southern Oscillation(ENSO) activities. From 4 500–4 100 a BP, the climate exhibited La Nina-like conditions with weak ENSO intensity and relatively stable and lower SSTA amplitudes. From 4 100–3 900 a BP, the climate underwent a complicated period of ENSO variability and showed alternating El Nino-or La Nina-like conditions at interdecadal time scales and large SSTA amplitudes. We speculate that during the early and middle stages of the 4.2 ka event, the cold climate caused by weak ENSO activities largely weakened social productivity. Then, during the end stages of the 4.2 ka event, the repeated fluctuations in the ENSO intensity caused frequent extreme weather events, resulting in the collapse of civilizations worldwide. Thus, the new evidence obtained from our coral records suggests that the 4.2 ka event as well as the related collapse of civilizations were very likely driven by ENSO variability.

关键词： 4.2 ka event ENSO variability SSTA coral growth rate Xisha Islands

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二甲双胍治疗头颈部鳞状细胞癌机制的研究进展

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口腔医学研究 2020年第12期36卷 1091-1094页

作者：张诗晨韩冰吉林大学口腔医院颌面外科吉林长春130021

头颈部鳞状细胞癌是全球第六大常见癌症,尽管治疗方法逐渐改善,其5年生存率仍仅为约63%。目前的治疗策略均带有不同程度的不良反应影响患者的生存质量。因此,找到一种毒性低、安全性高的治疗方法至关重要。二甲双胍是双胍类降糖药。研... 详细信息

头颈部鳞状细胞癌是全球第六大常见癌症,尽管治疗方法逐渐改善,其5年生存率仍仅为约63%。目前的治疗策略均带有不同程度的不良反应影响患者的生存质量。因此,找到一种毒性低、安全性高的治疗方法至关重要。二甲双胍是双胍类降糖药。研究表明,除降糖作用外,二甲双胍还可抑制多种癌症的发生与发展。二甲双胍抗头颈部鳞状细胞癌的机制可能包括降低胰岛素水平、抑制mTOR信号通路、抑制癌症干细胞、诱导细胞周期停滞并促进凋亡、免疫调节及增强辅助治疗效果等。本文结合现有文献就二甲双胍抗头颈部鳞状细胞癌可能的机制进行综述。

关键词：头颈部鳞状细胞癌二甲双胍作用机制

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Rice SPL10 positively regulates trichome development through expression of HL6 and auxin-related genes

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Journal of Integrative Plant Biology 2021年第8期63卷 1521-1536页

作者： Jinjie Li Bo Tang Yingxiu Li Chenguang Li Minjie Guo Haiyang Chen Shichen Han Jin Li Qijin Lou Wenqiang Sun Peng Wang Haifeng Guo Wei Ye Zhanying Zhang Hongliang Zhang Sibin Yu Long Zhang Zichao Li State Key Laboratory of Agrobiotechnology/Beijing Key Laboratory of Crop Genetic Improvement College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing100193 China National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural UniversityWuhan430070 China College of Plant Protection China Agricultural UniversityBeijing100193 China

Trichomes function in plant defenses against biotic and abiotic stresses;examination of glabrous lines,which lack trichomes,has revealed key aspects of trichome development and function.Tests of allelism in 51 glabrous rice(Oryza sativa)accessions collected worldwide identified OsSPL10 and OsWOX3B as regulators of trichome development in rice.Here,we report that OsSPL10 acts as a transcriptional regulator controlling trichome development.Haplotype and transient expression analyses revealed that variation in the approximately 700-bp OsSPL10 promoter region is the primary cause of the glabrous phenotype in the indica cultivar WD-17993.Disruption of OsSPL10 by genome editing decreased leaf trichome density and length in the NIL-HL6 background.Plants with genotype OsSPL10^(WD-17993)/HL6 generated by crossing WD-17993 with NIL-HL6 also had fewer trichomes in the glumes.HAIRY LEAF6(HL6)encodes another transcription factor that regulates trichome initiation and elongation,and OsSPL10 directly binds to the HL6 promoter to regulate its expression.Moreover,the transcript levels of auxin-related genes,such as OsYUCCA5 and OsPIN-FORMED1b,were altered in OsSPL10 overexpression and RNAi transgenic lines.Feeding tests using locusts(Locusta migratoria)demonstrated that non-glandular trichomes affect feeding by this herbivore.Our findings provide a molecular framework for trichome development and an ecological perspective on trichome functions.

关键词： auxin complementary genes hairy leaves Oryza sativa OsWOX3B

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基于虚拟机自省的Linux恶意软件检测方案

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信息网络安全 2024年第5期 657-666页

作者：文伟平张世琛王晗时林北京大学软件与微电子学院北京100871

随着物联网和云计算技术的快速发展,Linux恶意软件的数量和种类急剧增加,因此如何有效检测Linux恶意软件成为安全领域的重要研究方向之一。为了解决这一问题,文章提出一种基于虚拟机自省的Linux恶意软件检测方案。该方案利用虚拟机自省... 详细信息

随着物联网和云计算技术的快速发展,Linux恶意软件的数量和种类急剧增加,因此如何有效检测Linux恶意软件成为安全领域的重要研究方向之一。为了解决这一问题,文章提出一种基于虚拟机自省的Linux恶意软件检测方案。该方案利用虚拟机自省技术在沙箱外部安全获取内部运行状态,在实现全方位监控的同时,规避了恶意软件的反动态分析问题。与其他沙箱监控方案相比,文章所提方案增加了恶意软件在沙箱中的恶意行为表现的数量。针对特征之间的时序性,采用时序处理模型对沙箱获取的特征信息进行建模和训练,旨在判断Linux应用是否属于恶意软件。文章使用了3种神经网络,包括循环神经网络、长短期记忆网络和门控循环单元网络。实验结果表明,长短期记忆网络在该应用场景下检测效果更好,准确率达98.02%,同时具有较高的召回率,将虚拟机自省技术与神经网络模型结合应用于恶意软件检测,既能在虚拟机外部监控虚拟机内部,又考虑特征之间的时序性。

关键词：恶意软件检测虚拟机自省深度神经网络 Linux沙箱

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牛初乳营养组成和功能特性研究进展

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食品科学 2023年第13期44卷 397-407页

作者：韩立华朱师晨 Mike WEISER 毛学英中国农业大学食品科学与营养工程学院教育部-北京市共建功能乳品重点实验室北京100083 美国APS生物集团美国亚利桑那菲尼克斯85034

牛初乳是指奶牛自然分娩后最初几天内所分泌的乳汁,富含乳铁蛋白、免疫球蛋白、溶菌酶、乳过氧化物酶、抗菌肽和生长因子等多种活性成分。牛初乳特殊的营养组成赋予其调节免疫、改善胃肠道健康、促进骨骼健康以及加速伤口愈合等多种生... 详细信息

牛初乳是指奶牛自然分娩后最初几天内所分泌的乳汁,富含乳铁蛋白、免疫球蛋白、溶菌酶、乳过氧化物酶、抗菌肽和生长因子等多种活性成分。牛初乳特殊的营养组成赋予其调节免疫、改善胃肠道健康、促进骨骼健康以及加速伤口愈合等多种生物学活性,因此,牛初乳作为一种功能乳品或功能性乳基料受到广泛关注。本文对牛初乳的营养成分、生物学功能和加工稳定性等方面进行详细阐述,以期为牛初乳的开发应用和规范化生产提供参考。

关键词：牛初乳营养组成生物学功能加工稳定性牛初乳产品

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A novel protein domain is important for photosystem Ⅱ complex assembly and photoautotrophic growth in angiosperms

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Molecular Plant 2023年第2期16卷 374-392页

作者： Wei Li Jiangfan Guo Xue han Xiaowen Da Kai Wang Hongfei Zhao Shi-Tang Huange Bosheng Li hang He Ruirui Jiang shichen Zhou Peng Yan Tao Chen Yi He Jiming Xu Yu Liu Yunrong Wu Huixia Shou Zhongchang Wu Chuanzao Mao Xiaorong Mo State Key Laboratory of Plant Environmental Resilience College of Life ScienceZhejang UniversityHangzhou 310058PR China College of Life Science Shaanxi Normal UniversityXi'anShaanxi Province 710062PR China School of Advanced Agricultural Sciences and School of Life Sciences State Key Laboratory of Protein and Plant Gene ResearchPeking UniversityBeijing 100871China Peking University Institute of Advanced Agricultural Sciences Shandong Laboratory of Advanced Agricultural Sciences at WeifangWeifangShandong 261000China College of Urban Construction Zhejiang Shuren UniversityHangzhou 310015PR China School of Life Sciences Peking UniversityBeijing 100871PR China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityLin'anHangzhou 311300PR China

Photosystem Ⅱ(PSⅡ)is a multi-subunit protein complex of the photosynthetic electron transport chain that is vital to photosynthesis.Although the structure,composition,and function of PSⅡ have been extensively studied,its biogenesis mechanism remains less understood.Thylakoid rhodanese-like(TROL)provides an anchor for leaf-type ferredoxin:NADP^(+)oxidoreductase.Here,we report the chacterizaton of a second type of TROL protein,TROL2,encoded by seed plant genomes whose function has not previously been reported.We show that TROL2 is a PSⅡ assembly cofactor with essential roles in the establishment of photoautotrophy.TROL2 contains a 45-amino-acid domain,termed the chlorotic lethal seedling(CLS)domain,that is both necessary and sufficient for TROL2 function in PSⅡ assembly and photoautotrophic growth.Phylogenetic analyses suggest that TROL2 may have arisen from ancestral TROL1 via gene duplication before the emergence of seed plants and acquired the CLS domain via evolution of the sequence encoding its N-terminal portion.We further reveal that TROL2(or CLS)forms an assembly cofactor complex with the intrinsic thylakoid membrane protein LOW PSⅡ ACCUMULATION2 and interacts with small PSⅡ subunits to facilitate PSⅡ complex assembly.Collectively,our study not only shows that TROL2(CLS)is essential for photoautotrophy in angiosperms but also reveals its mechanistic role in PSⅡ complex assembly,shedding light on the molecular and evolutionary mechanisms of photosynthetic complex assemblyin angiosperms.

关键词： PSⅡassembly TROL2 assembly factors angiosperms evolution

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