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| 1 | Acetylglutamate kinase is required for both gametophyte function and embryo development in Arabidopsis thaliana显示文摘The specific functions of the genes encoding arginine biosynthesis enzymes in plants are not well characterized. We report the isolation and characterization of Arabidopsis thaliana N-acetylglutamate kinase(NAGK), which catalyzes the second step of arginine biosynthesis. NAGK is a plastid-localized protein and is expressed during most developmental processes in Arabidopsis. Heterologous expression of the Arabidopsis NAGK gene in a NAGK-deficient Escherichia coli strain fully restores bacterial growth on arginine-deficient medium. nagk mutant pollen tubes grow more slowly than wild type pollen tubes and the phenotype is restored by either specifically through complementation by NAGK in pollen, or exogenous supplementation of arginine. nagk female gametophytes are defective in micropylar pollen tube guidance due to the fact that female gametophyte cell fate specification was specifically affected. Expression of NAGK in synergid cells rescues the defect of nagk female gametophytes. Lossof-function of NAGK results in Arabidopsis embryos not developing beyond the four-celled embryo stage. The embryo-defective phenotype in nagk/NAGK plants cannot be rescued by watering nagk/NAGK plants with arginine or ornithine supplementation. In conclusion,our results reveal a novel role of NAGK and arginine in regulating gametophyte function and embryo development, and provide valuable insights into arginine transport during embryo development. | Jie Huang Dan Chen Hailong Yan Fei Xie Ying Yu Liyao Zhang Mengxiang Sun Xiongbo Peng | 2017 | Journal of Integrative Plant Biology2017，59，9： | 4 |
| 2 | Atomic force microscopic view of the fine topography on the tobacco stigma surface during its response to pollination显示文摘During compatible pollination in tobacco, an extracellular matrix (ECM) is secreted from the stigma surface; however, it is unknown whether the pattern of secretion across the stigma depends on the pollen source. In fact, technical limitations have prevented clear observation of ECM secretion. Here, we report the detailed topographic changes on the stigma surface that accompanies intraspecies and interspecies pollination in tobacco using contact mode atomic force microscopy (AFM). Our results, which show the dynamics and time course of ECM secretion after pollination, indicate that a certain pattern of secretion already exists on the stigma prior to pollination. Intraspecies induced a two-step response, characterized by topographical changes on the stigma surface several hours after pollina-tion, which was distinct from the pattern of ECM secretion induced by interspecies pollination. This difference was confirmed by root-mean-square analysis, which assessed the roughness of the stigma surface. Our findings indicate that compatible pollination not only induces ECM secretion from the stigma, but also results in a specific distribution of the ECM. Thus, this study demonstrates the pow-erful potential of AFM in studying the pollen-stigma interaction. | WU Hui LI Meng SUN MengXiang | 2008 | Chinese Science Bulletin2008，53，7： | 4 |
| 3 | Arabidopsis RAN 1 Mediates Seed Development through Its Parental .Ratio by Affecting the Onset of Endosperm Cellularization显示文摘尽管以前的研究证明了内乳开发被它的父母染色体体质影响,控制 parent-of-origin 效果的基因基础和分子的机制要求进一步的说明。这里我们 showthat 地岬相关的原子蛋白质(RAN1 ) 1 在 Arabidopsis thaliana 调整内乳开发。相互的十字在之间野类型(WT ) 并且当 RAN1 down-regulated/up-regulated 个人被用作一个男性 / 女性的父母时,转基因的线错误快车 RAN1 (msRAN1 ) 产生了小 F1 种子;相反,当 RAN1 down-regulated/up-regulated 植物被用作一个女性 / 男性的父母时, F1 种子被放弃,建议种子开发被 RAN1 的 theparental 染色体比率影响。而在野类型的植物的 RAN1 表示在内乳 cellularization 的发作前被减少,从相互的 crossesbetween WT 和 msRAN1 的 F1 种子显示出反常内乳 cellularization 和 RAN1 的宫外的表示。当 msRAN1 植物在相互的十字被使用时,也控制内乳 cellularizationwas 的基因也在这些相互的十字影响了的 MINISEED3 (MINI3 ) 的表示,和 misregulationof MINI3 活动救了 F1 种子。一起拿,我们的结果建议 RAN1 的父母比率通过它和 MINI3.Key 词的基因相互作用调整内乳 cellularization 的发作: | Peiwei Liu Ming Qi Yuqian Wang MingQin Chang Chang Liu Mengxiang Sun Weicai Yang Haiyun Ren | 2014 | Molecular Plant2014，7，8： | 2 |
| 4 | Cryopreservation of Pollen by Vitrification in Brassica显示文摘CryopreservationofPolenbyVitrificationinBrasicaXuBingfang,HanHongmei,ZhengCongyi,SunMengxiangColegeofLifeSciences,WuhanUnive... | Xu Bingfang Han Hongmei Zheng Congyi Sun Mengxiang | 1997 | Wuhan University Journal of Natural Sciences1997，2，1： | 2 |
| 5 | Editor’s note显示文摘The XXth International Congress on Sexual Plant Reproduction (SPR) was held from August 4 to 8, 2008, in Brasília, Brazil. Shortly afterward, 'Frontiers in Sexual Plant Reproduction III' was held on October 17–19, 2008, in Tucson, Arizona. Both conferences demonstrated that the richly historic | SUN MengXiang | 2009 | Chinese Science Bulletin2009，54，14： | 1 |
| 6 | What we have learned from transcript profile analyses of male and female gametes in flowering plants显示文摘Double fertilization is one of the predominant features of sexual reproduction in flowering plants but, because of the physical inaccessibility of gametes, the essential molecular mechanisms in these processes are largely unknown. Based on the techniques for isolating highly purified gametes from several species and well-developed methods for manipulating RNA from limited quantities of gametes, genome-wide investigations of gamete transcription profiles were recently conducted in flowering plants. In this review, we survey the accumulated knowledge on gamete collection and purification, cDNA library construction, and transcript profile analysis to assess our understanding of the molecular mechanisms of gamete specialization and fertilization. | XIN HaiPing & SUN MengXiang Key Laboratory of the Ministry of Education for Plant Developmental Biology, College of Life Science, Wuhan University, Wuhan 430072, China | 2010 | Science China(Life Sciences)2010，53，8： | 1 |
| 7 | Sexual Plant Reproduction: a Fertile and Flourishing Field显示文摘Since the very beginning of plant science, sexual plant reproduction (SPR) has proved an attractive and enduring topic for generations of botanists. With the rapid development of moderntechnology, a significant acceleration has occurred in | Mengxiang Sun,Professor The Editor for this Special Issue College of Life Sciences,Wuhan University,China | 2009 | Journal of Integrative Plant Biology2009，51，8： | 0 |
| 8 | The impact of the Russia-Ukraine conflict on global grain market and food security:Short-and long-term effects显示文摘Since the 24th February 2022,Russia has been conducting extensive air and missile strikes against the Ukraine military they have also been conducting concurrent ground offensives beyond Crimea and the Donbas breakaway entities.Recent reports highlighted that Russia has continually advanced in different maneuver axes and at present,no one can predict when and how the Ukraine conflict will end.For over three months,the conflict has greatly influenced the global economy and sounded the alarm bells for global food safety,especially to those countries which greatly depend on food and chemical fertilizer import from Russia and Ukraine,as well as those countries sensitive to food price variation shock. | Mengxiang Sun | 2022 | Seed Biology2022，1，1： | 0 |
| 9 | Professor Hong-Yuan Yang (1933-2010)显示文摘Prof. Hong-Yuan Yang,a renowned botanist,Academician of the Chinese Academy of Sciences and Professor of Wuhan University,passed away at the age of 77 in Wuhan on November 18,2010. | Mengxiang Sun Professor at Wuhan University,Wuhan,China Chun-Ming Liu Professor at Institute of Botany,Chinese Academy of Sciences,China | 2011 | Journal of Integrative Plant Biology2011，53，1： | 0 |
| 10 | RPL18aB helps maintain suspensor identity during early embryogenesis显示文摘During embryogenesis, plants are thought to use a mechanism that allows the suspensor to maintain its identity. Here, we reported that RPL_18aB is involved in this mechanism in Arabidopsis thaliana. The suspensor cells proliferated in rpl_18aB and formed a multicellular structure rather than undergo programmed cell death, as in wild type. Suspensors of rpl_18aB expressed the embryo proper marker, DRN::GFP, but not the suspensor marker, WOX8::GFP. In addition, auxin accumulated throughout the suspensors of rpl_18aB proembryos. Suspensor-specific expression of RPL_18aB could rescue the cell proliferation defects in rpl_18aB suspensors. These findings supported a role for RPL_18aB in maintaining suspensor identity. | fei xie hailong yan yang sun yameng wang hong chen wanying mao liyao zhang mengxiang sun xiongbo peng | 2018 | Journal of Integrative Plant Biology2018，60，4： | 0 |
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