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| 1 | The relationship between relative growth rate and whole-plant C:N:P stoichiometry in plant seedlings grown under nutrient-enriched conditions显示文摘Aims Recent theories indicate that N is more in demand for plant growth than P;therefore,N concentration and N:C and N:P ratios are predicted to be positively correlated with relative growth rate(RGR)in plants under nutrient-enriched conditions.This prediction was tested in this study.Methods We examined the whole-plant concentrations of C,N and P and RGR,as well as the relationship between RGR and the concentrations and the ratios of N:C,P:C and N:P,for different harvest stages(the days after seed germination)of the seedlings of seven shrub species and four herbaceous species grown in N and P non-limiting conditions.The relationships among plant size,nutrient concentrations and ratios were subsequently determined.Important Findings RGR was positively correlated with N concentration and the ratios of N:PandN:C when the data were pooled for all species and for each shrub species,but not for individual herbaceous species.However,the relationship between RGR and P concentration and P:C was not significantly correlated for either shrubs or herbs.The variation of N among harvest stages and species was much greater than that of P,and the variation in N:P ratio was determined primarily by changes in N concentration.The shrub species differed from the herbaceous species in their N and P concentrations,nutrient ratios and in intraspecific relationships between RGR and nutrient ratios.These differences possibly reflect differences in the capacity for P storage and biomass allocation patterns.In general,our data support recent theoretical predictions regarding the relationship between RGR and C:N:P stoichiometry,but they also show that species with different life forms differ in the relationships among RGR and C:N:P stoichimetries. | Youhong Peng Karl J.Niklas Shucun Sun | 2011 | Journal of Plant Ecology2011，4，3： | 5 |
| 2 | Revisiting an ancient inorganic aggregation-induced emission system:An enlightenment to clusteroluminescence显示文摘Organic and inorganic clusteroluminescence have attracted great attention while the underlying mechanisms is still not well understood.Here,we employed a series of ancient inorganic complexes platinocyanides with aggregation-induced emission property to elucidate the mechanism of clusteroluminescence including how does the chromophore form and how does the solid structures influence the luminescence behaviors.The results indicate that the isolated platinocyanide cannot work as a chromophore to emit visible light,while their clusterization at aggregate state can trigger the d-orbitals coupling of the platinum atoms to facilitate the electron exchange and delocalization to form a new chromophore to emit visible light.Furthermore,the counter ions and H2O ligands help to rigidify the three-dimensional network structure of the platinocyanides to suppress the excited state nonradiative decay,resulting in the high quantum yield of up to 96%.This work fundamentally helps understanding both the organic and inorganic clusteroluminescence phenomenon. | Zheng Zhao Zaiyu Wang Javad Tavakoli Guogang Shan Jianyu Zhang Chen Peng Yu Xiong Xuepeng Zhang Tsz Shing Cheung Youhong Tang Bolong Huang Zhaoxun Yu Jacky W.Y.Lam Ben Zhong Tang | 2021 | Aggregate2021，2，2： | 1 |
| 3 | Recent Progress of Synchrotron X-Ray Imaging and Diffraction on the Solidification and Deformation Behavior of Metallic Materials显示文摘Characterizing the microstructure and deformation mechanism associated with the performances and properties of metallic materials is of great importance in understanding the microstructure-property relationship.The past few decades have witnessed the rapid development of characterization techniques from optical microscopy to electron microscopy,although these conventional methods are generally limited to the sample surface because of the intrinsic opaque nature of metallic materials.Advanced synchrotron radiation(SR)facilities can produce X-rays with strong penetrability and high spatiotemporal resolution,and thereby enabling the non-destructive visualization of full-field structural information in three dimensions.Tremendous endeavors were devoted to the 3 rd generation SR over the past three decades,in which X-ray beams have been focused down to 100 nm.In this paper,recent progresses on SR-related characterization technologies were reviewed,with particular emphases on the fundamentals of synchrotron X-ray imaging and synchrotron X-ray diffraction,as well as their applications in the in situ observations of material preparation(e.g.,in situ dendrite growth during solidification)and service under extreme environment(e.g.,in situ mechanics).Future innovations toward next-generation SR and newly emerging SRbased technologies such as dark-field X-ray microscopy and Bragg coherent X-ray diffraction imaging were also advocated. | Youhong Peng Kesong Miao Wei Sun Chenglu Liu Hao Wu Lin Geng Guohua Fan | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，1： | 0 |
| 4 | Do plants explore habitats before exploiting them? An explicit test using two stoloniferous herbs显示文摘We tested whether the processes of exploration and exploitation can be explicitly distinguished as plants grow and develop within a habitat using two stoloniferous clonal herbs,Hydrocotyle sibthorpioides(Umbelliferae) and Potentilla anserina(Rosaceae).Ramets were planted in four circular trays differing in diameter.One replicate from each diameter-group was sampled at intervals corresponding to plant coverage of the trays,and plant biomass allocation to leaves,stolons,and roots and internode length were quantified.For both species,at early sampling times(when the smallest trays were full),total plant biomass and ramet number were larger in the smaller trays than in the larger trays.However,this trend was reversed for plants collected at later times.For H.sibthorpioides,leaf mass ratios(leaf mass to total plant mass) were significantly greater,but stolon mass ratios(stolon mass to total plant mass) were less in the small trays than in the larger ones,particularly during the early stages of the experiment.Similarly,for P.anserina,leaf mass ratios decreased in the smaller trays but increased in the larger ones as the experiment progressed.Root mass ratios showed contrasting pattern to leaf mass ratios for both species;stolon mass ratios were significantly smaller in the smaller trays than in the larger ones,although there were no obvious patterns during the course of the experiment.In addition,for both species,internode length was shorter but the number of ramets was greater in the smaller trays at early sampling times.We conclude that plants invest greater biomass in resource-exploring organs(stolons) than in resource-exploiting organs(leaves or roots) as they initially establish in a habitat.The relatively lower plant productivity in the largest trays at early sampling times presumably reflects the cost of exploration prior to resource exploitation and utilization. | PENG YouHong NIKLAS KarlJ SUN ShuCun | 2012 | Chinese Science Bulletin2012，57，19： | 0 |
| 5 | Elevated Kir2.1/nuclear N2ICD defines a highly malignant subtype of non-WNT/SHH medulloblastomas显示文摘Medulloblastoma(MB)is one of the most common childhood malignant brain tumors(WHO grade IV),traditionally divided into WNT,SHH,Group 3,and Group 4 subgroups based on the transcription profiles,somatic DNA alterations,and clinical outcomes.Unlike WNT and SHH subgroup MBs,Group 3 and Group 4 MBs have similar transcriptomes and lack clearly specific drivers and targeted therapeutic options.The recently revised WHO Classification of CNS Tumors has assigned Group 3 and 4 to a provisional non-WNT/SHH entity.In the present study,we demonstrate that Kir2.1,an inwardly-rectifying potassium channel,is highly expressed in non-WNT/SHH MBs,which promotes tumor cell invasion and metastasis by recruiting Adam10 to enhance S2 cleavage of Notch2 thereby activating the Notch2 signaling pathway.Disruption of the Notch2 pathway markedly inhibited the growth and metastasis of Kir2.1-overexpressing MB cell-derived xenograft tumors in mice.Moreover,Kir2.1^(high)/nuclear N2ICD^(high)MBs are associated with the significantly shorter lifespan of the patients.Thus,Kir2.1^(high)/nuclear N2ICD^(high)can be used as a biomarker to define a novel subtype of non-WNT/SHH MBs.Our findings are important for the modification of treatment regimens and the development of novel-targeted therapies for non-WNT/SHH MBs. | Yan-Xia Wang Haibo Wu Yong Ren Shengqing Lv Chengdong Ji Dongfang Xiang Mengsi Zhang Huimin Lu Wenjuan Fu Qing Liu Zexuan Yan Qinghua Ma Jingya Miao Ruili Cai Xi Lan Bin Wu Wenying Wang Yinhua Liu Dai-Zhong Wang Mianfu Cao Zhicheng He Yu Shi Yifang Ping Xiaohong Yao Xia Zhang Peng Zhang Ji Ming Wang Yan Wang Youhong Cui Xiu-Wu Bian | 2022 | Signal Transduction and Targeted Therapy2022，7，4： | 0 |
| 6 | Capitulum density-dependent effects generate peak seed yield at an intermediate density of a Tibetan lotus显示文摘Aims Theory suggests that species perform best at intermediate densities,where density-dependent facilitation and antagonism are balanced,but empirical evidence is scarce,particularly in plants.In a selfincompatible perennial herb(Saussurea nigrescens),whose recruitment heavily relies on seed output,we test whether both intraspecific facilitation and antagonism significantly affect seed production,resulting in highest seed yield at an intermediate capitulum density.Methods Plots with different S.nigrescens densities were sampled in an Eastern Tibetan meadow during the growing season of 2012 to investigate the relationships between capitulum density and pollinator visitation rate,seed set ratio,parasite ratio,seed damage ratio,and capitulum size.Both simple linear and quadratic models were employed to determine the shape of relationships.Important Findings In line with general theory,hump-shaped relationships of capitulum density versus seed set ratio and number of florets per capitulum indicate intraspecific facilitation in sparse populations,which can be attributed to positive density-dependent pollinator visitation and the amelioration of detrimental physical factors.However,the proportion of seeds damaged by pre-dispersal predators increased monotonically with capitulum density,which may have—in combination with increased intraspecific competition for light and soil nutrients—resulted in density-dependent antagonism.Both positive and negative density-dependent agents acted simultaneously throughout the density range investigated and led to the highest seed yield at intermediate density levels in the Tibetan lotus.More efforts concurrently exploring the two effects are needed to facilitate understanding species abundance and community structure. | Xinqiang Xi Junpeng Mu Youhong Peng Nico Eisenhauer Shucun Sun | 2016 | Journal of Plant Ecology2016，9，1： | 0 |
| 7 | PbrRALF2-elicited reactive oxygen species signaling is mediated by the PbrCrRLK1L13-PbrMPK18 module in pear pollen tubes显示文摘Rapid alkalinization factors(RALFs)are cysteine-rich peptides that play important roles in a variety of biological processes,such as cell elongation and immune signaling.Recent studies in Arabidopsis have shown that RALFs regulate pollen tube growth via plasma membrane receptor-like kinases(RLKs).However,the downstream signal transduction mechanisms of RLKs in pollen tubes are unknown.Here,we identified PbrRALF2,a pear(Pyrus bretschneideri)pollen RALF peptide that inhibits pollen tube growth.We found that PbrRALF2 interacts with a malectin-like domain-containing RLK,PbrCrRLK1L13.The relative affinity between PbrRALF2 and PbrCrRLK1L13 was at the submicromolar level,which is consistent with the values of ligand–receptor kinase pairs and the physiological concentration for PbrRALF2-mediated inhibition of pollen tube growth.After binding to its extracellular domain,PbrRALF2 activated the phosphorylation of PbrCrRLK1L13 in a dose-dependent manner.We further showed that the MAP kinase PbrMPK18 is a downstream target of PbrCrRLK1L13 that mediates PbrRALF2-elicited reactive oxygen species(ROS)production.The excessive accumulation of ROS inhibits pollen tube growth.We show that MPK acts as a mediator for CrRLK1L to stimulate ROS production,which might represent a general mechanism by which RALF and CrRLK1L function in signaling pathways. | Xiaobing Kou Jiangmei Sun Peng Wang Danqi Wang Peng Cao Jing Lin Youhong Chang Shaoling Zhang Juyou Wu | 2021 | Horticulture Research2021，8，1： | 0 |
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