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The polyketide synthase OsPKS2 is essential for pollen exine and Ubisch body patterning in rice

Journal of Integrative Plant Biology 2017年第9期59卷 612-628页

作者： Xiaolei Zhu Jing Yu Jianxin Shi Takayuki Tohge Alisdair R.Fernie Sagit Meir Asaph Aharoni Dawei Xu dabing zhang Wanqi Liang Joint International Research Laboratory of Metabolic&Developmental Sciences Shanghai Jiao Tong University-University of Adelaide Joint Centre for Agriculture and HealthSchool of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China Central Metabolism Group Max Planck Institute of Molecular Plant Physiology14476 Potsdam-GolmGermany Department of Plant Sciences Weizmann Institute of SciencePO Box 26Rehovot 76100Israel School of Agriculture Food and WineUniversity of AdelaideWaite CampusSA 5005Australia

Lipid and phenolic metabolism are important for pollen exine formation. In Arabidopsis, polyketide synthases （PKSs） are essential for both sporopollenin biosynthesis and exine formation. Here, we characterized the role of a polyketide synthase （OsPKS2） in male reproduction of rice （Oryza sativa）. Recombinant OsPKS2 catalyzed the condensation of fatty acyl-CoA with malonyl- CoA to generate triketide and tetraketide α-pyrones, the main components of pollen exine. Indeed, the ospks2 mutant had defective exine patterning and was male sterile. However, the mutant showed no significant reduction in sporopollenin accumulation. Compared with the WT （wild type）, ospks2 displayed unconfined and amorphous tectum and nexine layers in the exine, and less organized Ubisch bodies. Like the pksb/lap5 mutant of the Arabidopsis ortholog, ospks2 showed broad alterations in the profiles of anther-related phenolic compounds. However, unlike pksb/laps, in which most detected phenolics were substantially decreased, ospks2 accumu- lated higher levels of phenolics. Based on these results and our observation that OsPKS2 is unable to fully restore the exine defects in the pksb/laps, we propose that PKS proteins have functionally diversified during evolution. Collectively, our results suggest that PKSs represent a conserved and diversified biochemical pathway for anther and pollen development in higher plants.

关键词： PKS The polyketide synthase OsPKS2 is essential for pollen exine and Ubisch body patterning in rice Figure

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Rice CYP703A3, a cytochrome P450 hydroxylase, is essential for development of anther cuticle and pollen exine

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Journal of Integrative Plant Biology 2014年第10期56卷 979-994页

作者： Xijia Yang Di Wu Jianxin Shi Yi He Franck Pinot Bernard Grausem Changsong Yin Lu Zhu Mingjiao Chen Zhijing Luo Wanqi Liang dabing zhang State Key Laboratory of Hybrid Rice School of Life Sciences and Biotechnology Shanghai Jiao Tong University Institute of Plant Molecular Biology National Center for Scientific Research University of Strasbourg

Anther cuticle and pollen exine act as protective envelopes for the male gametophyte or pollen grain, but the mechanism underlying the synthesis of these lipidic polymers remains unclear. Previously, a tapetum‐expressed CYP703A3, a putative cytochrome P450 fatty acid hydroxylase, was shown to be essential for male fertility in rice（Oryza sativa L.）. However,the biochemical and biological roles of CYP703A3 has not been characterized. Here, we observed that cyp703a3‐2 caused by one base insertion in CYP703A3 displays defective pollen exine and anther epicuticular layer, which differs from Arabidopsis cyp703a2 in which only defective pollen exine occurs. Consistently, chemical composition assay showed that levels of cutin monomers and wax components were dramatically reduced in cyp703a3‐2 anthers. Unlike the wide range of substrates of Arabidopsis CYP703A2, CYP703A3 functions as an in‐chain hydroxylase only for a specific substrate, lauric acid, preferably generating 7‐hydroxylated lauric acid. Moreover, chromatin immunoprecipitation and expression analyses revealed that the expression of CYP703A3 is directly regulated by Tapetum Degeneration Retardation, a known regulator of tapetum PCD and pollen exine formation. Collectively, our results suggest that CYP703A3 represents a conserved and diversified biochemical pathway for in‐chain hydroxylation of lauric acid required for the development of male organ in higher plants.

关键词： Anther cuticle CYP703A3 cytochrome P450 hydroxylase 7‐hydroxylated lauric acid pollen exine

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Interactions of OsMADS1 with Floral Homeotic Genes in Rice Flower Development

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Molecular Plant 2015年第9期8卷 1366-1384页

作者： Yun Hu Wanqi Liang Changsong Yin Xuelian Yang Baozhe Ping Anxue Li Ru Jia Mingjiao Chen Zhijing Luo Qiang Cai Xiangxiang Zhao dabing zhang Zheng Yuan State Key Laboratory of Hybrid Rice Shanghai Jiao Tong University-University of Adelaide Joint Centre for Agriculture and Health School of Life Sciences andBiotechnology Shanghai Jiao Tong University Shanghai 20040 China Shanghai Ocean University Shanghai 201306 China jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection Huaiyin Normal University Huaian 223300 China School of Agriculture Food and Wine University of Adelaide Waite Campus Urrbrae SA 5064 Australia

During reproductive development, rice plants develop unique flower organs which determine the final grain yield. OsMADS1, one of SEPALLATA-like MADS-box genes, has been unraveled to play critical roles in rice floral organ identity specification and floral meristem determinacy. However, the molecular mechanisms underlying interactions of OsMADS1 with other floral homeotic genes in regulating flower development remains largely elusive. In this work, we studied the genetic interactions of OsMADS1 with B-, C-, and D-class genes along with physical interactions among their proteins. We show that the physical and genetic interactions between OsMADS1 and OsMADS3 are essential for floral meristem activity maintenance and organ identity specification; while OsMADS1 physically and genetically interacts with OsMADS58 in regu- lating floral meristem determinacy and suppressing spikelet meristem reversion. We provided important genetic evidence to support the neofunctionalization of two rice C-class genes （OsMADS3 and OsMADS58） during flower development. Gene expression profiling and quantitative RT-PCR analyses further revealed that OsMADS1 affects the expression of many genes involved in floral identity and hormone signaling, and chromatin immunoprecipitation （ChlP）-PCR assay further demonstrated that OsMADS17 is a direct target gene of OsMADS1. Taken together, these results reveal that OsMADS1 has diversified regulatory functions in specifying rice floral organ and meristem identity, probably through its genetic and physical interactions with different floral homeotic regulators.

关键词： OsMADS1 floral homeotic genes floral organ identity floral meristem regulatory network

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Nonvolatile and reconfigurable two-terminal electro-optic duplex memristor based on Ⅲ-nitride semiconductors

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Light(Science & Applications) 2024年第4期13卷 706-716页

作者： Zhiwei Xie Ke Jiang Shanli zhang Jianwei Ben Mingrui Liu Shunpeng Lv Yang Chen Yuping Jia Xiaojuan Sun dabing Li State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesDongnanhu Road No.3888Changchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesYuquan Road No.19100049 BeijingChina

With the fast development of artificial intelligence(AI),Internet of things(IOT),etc,there is an urgent need for the technology that can efficiently recognize,store and process a staggering amount of *** AlScN material has unique advantages including immense remnant polarization,superior temperature stability and good latticematch to other III-nitrides,making it easy to integrate with the existing advanced III-nitrides material and device ***,due to the large band-gap,strong coercive field,and low photo-generated carrier generation and separation efficiency,it is difficult for AlScN itself to accumulate enough photo-generated carriers at the surface/interface to induce polarization inversion,limiting its application in in-memory sensing and *** this work,an electro-optic duplex memristor on a GaN/AlScN hetero-structure based Schottky diode has been *** twoterminal memristor shows good electrical and opto-electrical nonvolatility and *** both electrical and opto-electrical modes,the current on/off ratio can reach the magnitude of 104,and the resistance states can be effectively reset,written and long-termly *** on this device,the“IMP”truth table and the logic“False”can be successfully reproduced,indicating the huge potential of the device in the field of in-memory sensing and computing.

关键词： polarization duplex limiting

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Preparation of Tartary Buckwheat Seed Coating Agent and Its Effect on Germination

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Phyton-International Journal of Experimental Botany 2024年第4期93卷 699-712页

作者： Xin Zou Jieyu zhang Ting Cheng Yangyang Guo Xiao Han Han Liu Yuxing Qin Jie Li dabing Xiang Key Laboratory of Coarse Cereal Processing Ministry of Agriculture and Rural AffairsCollege of Food and Biological EngineeringChengdu UniversityChengdu610106China Agricultural Service Center People’s Government of Yanglu TownYunyang CountyChongqing404512China

To mitigate the wastage of seed resources and reduce the usage of pesticides and fertilizers, seed coating agentshave gained popularity. This study employs single-factor and multi-index orthogonal experimental design methodsto investigate the seed coating formula and physical properties of Tartary buckwheat. The specific effects ofeach component on Tartary buckwheat seed germination are analyzed. The findings reveal that the seed coatingagent formulated with 1.5% polyvinyl alcohol, 0.15% sodium alginate, 0.2% op-10, 0.1% polyacrylamide, 8% colorant,3% ammonium sulfate, 1% potassium dihydrogen phosphate, and 0.15% carbendazim exhibits the mosteffective coating. It demonstrates optimal physical properties and promotes seed germination efficiently. The suspensionrate of this seed coating agent reaches 91.12%, with a mere 2.13% coating shedding rate and 2.5% coatingseed rot rate. Furthermore, it achieves a germination percentage of 99.17%, which is 20.84% higher than the lowestgroup. The germination potential and index are also significantly higher than the lowest group, with anincrease of 20.84% and 26.56%, respectively. Additionally, the vitality index is 553.08, a 15.75% increase comparedto the lowest group. The application of seed coating agents helps reduce seed resource loss, increase plant numbers,and ultimately enhance agricultural yields. This finding holds practical significance in agriculturalproduction.

关键词： Tartary buckwheat seed coating agent formula germination

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LiCo_(0.9)O_2协同低温等离子体技术净化PM和NO_x

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华中科技大学学报（自然科学版） 2016年第9期44卷 129-132页

作者：肖静王伟罗大兵张继晨武汉理工大学材料复合新技术国家重点实验室湖北武汉430070 武汉理工大学汽车工程学院湖北武汉430070 武汉理工大学现代汽车零部件技术湖北省重点实验室湖北武汉430070 武汉理工大学汽车零部件技术湖北省协同创新中心湖北武汉430070

用溶液燃烧法制备出铜铁矿型催化剂LiCo0.9O2,用于净化柴油机排气污染物.通过小样实验研究了催化剂助剂以及催化剂二次涂覆对净化效果的影响,并结合NTP研究了等离子体对催化剂活性的影响.结果表明:TiO2,La2O3和CeO2三种氧化物助剂的加... 详细信息

用溶液燃烧法制备出铜铁矿型催化剂LiCo0.9O2,用于净化柴油机排气污染物.通过小样实验研究了催化剂助剂以及催化剂二次涂覆对净化效果的影响,并结合NTP研究了等离子体对催化剂活性的影响.结果表明:TiO2,La2O3和CeO2三种氧化物助剂的加入能够使NOx的最大转化率提高到17.6%;催化剂的二次涂覆能够使净化效率略有提高,NOx的最大转化率达到17.8%;NTP的加入能够显著提高催化剂的净化效率,其中在30kV电压和50Hz频率下,NTP前置能够使NOx的最大转化率达到25.0%.

关键词：柴油机铜铁矿催化剂净化二次涂覆催化剂助剂等离子体

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水禽新发病防控进展

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中国家禽 2009年第18期31卷 33-35页

作者：张大丙中国农业大学北京100193

关于水禽禽流感，尤其是鸭，过去教科书和资料记载普遍认为水禽仅为流感病毒的携带者而不发病，然而自20世纪90年代中期以来，水禽感染高致病力流感病毒发病、死亡的事实打破了人们对水禽流感的传统认识。水禽疾病的流行日趋复杂。老病... 详细信息

关于水禽禽流感，尤其是鸭，过去教科书和资料记载普遍认为水禽仅为流感病毒的携带者而不发病，然而自20世纪90年代中期以来，水禽感染高致病力流感病毒发病、死亡的事实打破了人们对水禽流感的传统认识。水禽疾病的流行日趋复杂。老病仍在流行，新病陆续出现，老病原发生变异，带毒不发病的病原转变为致死性感染。

关键词：水禽疾病发病防控流感病毒资料记载高致病力禽流感携带者

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鸭病防制技术

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中国家禽 2010年第18期32卷 42-44页

作者：张大丙中国农业大学动物医学院北京100094

1鸭病毒性肝炎1．1特点鸭病毒性肝炎是一种危害幼龄鸭的高度致死性传染病，1周龄左右的雏鸭最易发生，发病急、病程短、传播快、死亡率高，病鸭呈角弓反张样外观，肝脏有出血点（见图1、2）。

关键词：鸭病毒性肝炎防制技术传染病致死性死亡率幼龄雏鸭周龄

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桩锤同步振动系统的机电耦合特性及同步控制

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同济大学学报（自然科学版） 2012年第6期40卷 920-925页

作者：来鑫乌建中周文张大兵同济大学机械与能源工程学院上海201804

控制同步是实现多锤联动的有效方式之一.针对目前存在的两台桩锤控制同步时出现的机电耦合现象,建立了打桩过程中的"锤-桩-土"系统的动力学数学模型,并构建了两桩锤同步振动系统的机电耦合模型,在此基础上进行了数值仿真分析,发现机电... 详细信息

控制同步是实现多锤联动的有效方式之一.针对目前存在的两台桩锤控制同步时出现的机电耦合现象,建立了打桩过程中的"锤-桩-土"系统的动力学数学模型,并构建了两桩锤同步振动系统的机电耦合模型,在此基础上进行了数值仿真分析,发现机电耦合的结果是在一定的条件下出现自同步现象.对机电耦合下的同步控制策略与算法进行了研究,确立了"虚拟主令+比例-积分-微分算法(PID)"的控制方式,最后通过试验验证了机电耦合规律的正确性及同步控制策略与算法的有效性,控制同步的精度可以满足工程应用.

关键词：多锤联动机电耦合同步控制虚拟主令+PID

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THERMOSENSITIVE FLORAL DEFECTIVE is required for inflorescence and spikelet development in rice under changing environment

THERMOSENSITIVE FLORAL DEFECTIVE is required for inflorescen...

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第十九届中国作物学会学术年会

作者：张鹏 Ruifeng Fu Wanwan Zhu Yi He dabing zhang 梁婉琪 Joint International Research Laboratory of Metabolic & Developmental Sciences School of Life Sciences and BiotechnologyShanghai Jiao Tong University

Inflorescence and floral development determine grain yields in crops. Rice evolved complicated molecular networks determining the panicle and spikelet architecture in response to changeable environments, yet the underlying mechanisms are largely unknown. Here, we report that a novel rice transcription factor, THERMOSENSITIVE FLORAL DEFECTIVE(TFD) plays an important role in spikelet development under environmental temperature changes. tfd-1 mutant has one base pair insertion close to the stop codon, which leads to frame shift and the production of a longer protein with a mutated C terminus. tfd-1 shows environmental temperature-sensitive spikelet developmental defects. tfd-1 grows normally under low ambient temperature(LT) condition, but shows pleotropic floral defects under high ambient temperature(HT) conditions. Using CRISPR/Cas9 technology we created two new tfd alleles, tfd-2 and tfd-3, both carry 1 bp insertion at the second exon, leading to premature translation stop and the production of a truncated protein. tfd-2 and tfd-3 show much stronger developmental defects during reproduction under HT condition, but recover to normal growth under LT similar to tfd-1. Transcriptome analysis reveals that mutation in TFD1 affects the expression of genes involved in the inflorescence and floral organ development, including several genes belong to YABBY and MADS-box gene families. Noteworthy, TFD1 directly regulate YAB1 and YAB4 expression and double knockout of YAB3 and YAB4 leads to defects in inflorescence development similar to those observed in tfd1 under HT condition. Furthermore, overexpression of Os MADS1 partially rescues the floral phenotypes of tfd-1, suggesting that TFD may have direct genetic interaction with MADS-box genes in regulating rice spikelet development. We further demonstrate that TFD is induced by elevated temperature. In addition, the mutated protein(TFD?89) is unstable and degraded under high ambient temperature, indicating that the C-terminal of

关键词： rice thermo-sensitive inflorescence spikelet YABBY gene family MADS-box gene family

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