|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Floristic composition and endemism pattern of vascular plants in Ethiopia and Eritrea显示文摘Traditional attempts to delineate floristic regions are typically based on the qualitative analysis of species distribution,often ignoring the phylogenetic relationships among their taxa.Ethiopia and Eritrea are in the Horn of Africa,known as one of the world's biodiversity hotspots.We quantitatively classified the flora of Ethiopia and Eritrea into meaningful geographical units by analyzing the taxonomic and phylogeneticβ‐diversity at genera,total species,and endemic species levels at a scale of 0.5°×0.5°grid cells.Hierarchical clustering was used to quantitatively delimitate the flora and analysis of similarities was used to test the significant difference between the derived groups in taxonomic composition and phylogenetic relatedness.In total,two floristic subprovinces,five floristic districts,and 13 floristic subdistricts,as well as three centers of species endemism associated with three floristic subdistricts were identified.Our results also showed that the species diversity,endemism,and turnover of the highlands in Ethiopia and Eritrea were much higher than the lowlands,indicating that the floristic differences are closely related to the topography of the East African Rift.In this study,we provided a scientific framework for the composition and relationships of the floristic units in the Horn of Africa,and similarly provided a scientific basis for better conservation of the diversity in this region. | Sheng‐Wei Wang Biyansa Hirpo Boru Antony Waigwa Njogu Anne Christine Ochola Guang‐Wan Hu Ya‐Dong Zhou Qing‐Feng Wang | 2020 | Journal of Systematics and Evolution2020，58，1： | 2 |
| 2 | Over expression of TaFer gene from Tamarix androssowii improves iron and drought tolerance in transgenic Populus tomentosa显示文摘Ferritin, a universal intracellular protein, can store large amounts of iron and improve plant resistance to abiotic and biotic stress. In this study, a ferritin gene(TaFer) from Tamarix androssowii Litv. was transferred into Populus tomentosa Carr. cv 'BJR01' via Agrobacterium. Six independent transgenic lines were obtained with a tolerance to kanamycin and three were randomly selected for further analysis. The PCR and RT-PCR results indicate that the TaFer gene had been integrated into the poplar genome. The effect of the gene on abiotic stress tolerance was tested, and the results show that transgenic plants improve growth, had higher chlorophyll and lower MDA contents, and higher relative electrical conductivity,fewer changes of SOD and POD activities, higher iron content, higher root ferric reductase activity and lower levels of ROS accumulation and cell death in response to drought, Fe-insufficient or Fe-excess tolerance. These results indicate that the TaFer gene can improve abiotic stress tolerance in transgenic Populus tomentosa. | Bo Zhao Jingli Yang Wenjing Yao Boru Zhou Wei Zheng Tingbo Jiang | 2019 | Journal of Forestry Research2019，30，1： | 1 |
| 3 | Numerical Simulation of the Multicomponent Mass Transfer during Bridgman Growth of CdZnTe Crystal Using Maxwell-Stefan Diffusion Model显示文摘To reveal the complicated mechanism of the multicomponent mass transfer during the growth of ternary compound semiconductors, a numerical model based on Maxwell-Stefan equations was developed to simulate the Bridgman growth of CdZnTe crystal. The Maxwell-Stefan diffusion coefficients in the melt were estimated. Distributions of Zn, Cd, and Te were calculated with variable ampoule traveling rate and diffusion coefficients. The experimental results show that Zn in melt near the growth interface decreases and diffuses from the bulk melt to the growth interface. For Cd, the situation is just the opposite. The coupling effects of Zn and Cd diffusions result in an uphill diffusion of Te at the beginning of the growth. Throughout the growth, the concentration of Te in the melt keeps low near the growth interface but high far from the growth interface. Increasing the ampoule traveling rate will aggravate the segregation of Zn and Cd, and hence deteriorate the uniformity of Te. We also find that not only the diffusion coefficients but also the ratios between them have significant influence on the species diffusions. | 殷利迎 介万奇 WANG Tao ZHOU Boru YANG Fan | 2017 | Journal of Wuhan University of Technology(Materials Science)2017，32，2： | 0 |
| 4 | Ectopic expression of poplar gene PsnERF138 in tobacco confers salt stress tolerance and growth advantages显示文摘The AP2/ERF family is one of the largest plant-specific transcription factors and plays a vital role in plant growth and stress response.In this study,PsnERF138 was cloned from Populus alba×Populus glandulosa and transformed into tobacco using the Agrobacterium-mediated transformation method.PsnERF138 was localized in the nucleus through subcellular localization assay in tobacco.Under normal conditions,the root lengths of PsnERF138 transgenic lines were much longer than those of wild type.Under salt stress,the transgenic tobacco lines over-expressing PsnERF138 showed a significant increase in seed germination rate,plant height,and root length,compared to control plants.In addition,the transgenic tobacco lines displayed some advantages at the physiological level,such as higher superoxide dismutase(SOD)activity,peroxidase(POD)activity,proline content,and lower malondialdehyde(MDA)content,as compared to those in the control plants.Histochemical staining also showed that the transgenic tobacco lines had lower reactive oxygen species(ROS)accumulation,compared to control plants under salt stress.The combined results indicate that poplar PsnERF138 plays a contributing role in augmenting salt tolerance and conferring multiple growth advantages as being overexpressed in tobacco. | Lin Liu Zihan Cheng Wenjing Yao Xueyi Wang Fenglin Jia Boru Zhou Tingbo Jiang | 2021 | Forestry Research2021，1，1： | 0 |
| 5 | Species richness and phylogenetic diversity of different growth forms of angiosperms across a biodiversity hotspot in the horn of Africa显示文摘Woody and herbaceous plants are differentially influenced by the environment,with non-random association with the evolutionary history of these taxa and their traits.In general,woody plants may have climatedominated niches,whereas herbaceous plants may have edaphic and microhabitat-dominated niches.Here,we explored and mapped how the patterns of species richness,phylogene廿c diversity,and structures of total,woody,and herbaceous plants vary across the geographical regions and with respect to 12 environmental variables across Ethiopia and Eritrea,in the horn of Africa.Our result showed that both richness and phylogenetic diversity had almost the same tendency in total woody and herbaceous plants,in which they showed positive relationships with annual precipitation,precipitation annual range of climate,all the three variables of topography,and total nitrogen and total extractable phosphorus of soil,and negative relat:ions with mean annual temperature.Compared with the total and herbaceous plants,the environmental variables explained greater variance both in the standardized effect size phylogenetic diversity and net relatedness index for woody plants.Our results highlight that,on the large spatial scales,the environmentai filtering process has played a greater role in structuring species into local communities for woody plants than for herbaceous plants. | Ya-Dong Zhou Biyansa Hirpo Boru Sheng-Wei Wang Qing-Feng Wang | 2021 | Journal of Systematics and Evolution2021，59，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员