In this study, 22 leaf samples of 22 Lilieae species were collected in six Province at 90 - 3740 m to study the variations of leaf characteristics with altitude change. The Qualitative character of leaf epidermis and ...In this study, 22 leaf samples of 22 Lilieae species were collected in six Province at 90 - 3740 m to study the variations of leaf characteristics with altitude change. The Qualitative character of leaf epidermis and two stomatal indexes, viz. stomatal area (SA), stomatal index (SI), were analyzed in laboratory. The results show that: 1) the shape of the leaf epidermis cells and the pattern of the anticlinal walls provide some useful taxonomic information to distinguish the genus, however, none of the stable traits are exclusive to a genus;2) there are significant or even very significant linear correlations between the two indexes and altitude, of which SA exhibit a negative correlation with altitude (r<sup>2</sup> = 0.294, p = 0.009), while SI exhibit a positive correlation with altitude (r<sup>2</sup> = -0.254, p = 0.017). As a result, the pattern of leaf cells and anticlinal walls is influenced by genetic factors, while the stomatal area and stomatal index are influenced by environmental factors. Members of the tribe Lilieae have a relatively stable elevation range, which is related to their long-term adaptation to the local environment in the structure of their leaf epidermis.展开更多
Lilium nepalense D. Don is an ornamental plant and exhibits high morphological variation across its distribution range in China. There is incongruence between different data sets for the status of it in Lilium. In thi...Lilium nepalense D. Don is an ornamental plant and exhibits high morphological variation across its distribution range in China. There is incongruence between different data sets for the status of it in Lilium. In this study, we reported a complete chloroplast genome of L. nepalense sampled in Hengduan Mountains, China. The whole chloroplast genome possessed a total length of 152,206 bp with typical circular structure, and contained a large single copy (LSC) of 81,854 bp and a small single copy (SSC) of 17,563 bp, which were separated by a pair of inverted repeats (IRa/IRb) of 26,399 bp. The average GC content among the whole chloroplast genome sequence was 37%, and the GC content in LSC, SSC, IRs regions were 34.8%, 30.6%, and 42.5%, respectively. There were 135 genes detected from the whole chloroplast genome sequence, including 89 protein-coding genes, 38 tRNAs, and 8 rRNAs. Phylogenetic results using maximum likelihood and Bayesian methods showed congruent results that L. nepalense together with the other two L. nepalense samples collected from different habitats formed a single branch, indicating a close relationship of L. nepalense with L. taliense belonging to the section Sinomartagon. This newly characterized chloroplast genome will provide essential data for the further population genetics research of L. nepalense.展开更多
C–Obond activation is a highly efficient,fundamental strategy in the depolymerization and hydrodeoxygenation of chemicals with oxygen-containing functional groups such as oil,coal,and biomass.Developing efficient cat...C–Obond activation is a highly efficient,fundamental strategy in the depolymerization and hydrodeoxygenation of chemicals with oxygen-containing functional groups such as oil,coal,and biomass.Developing efficient catalysts for C–Oactivation with ultralow-loading noble and non-noble metals is highly desirable for the improvement of metal atomic utilization.Herein,bimetallic catalysts with atomically dispersed Pt and NiO clusters on different supports were fabricated,and the prepared Pt^(δ+)-NiO/Nb_(2)O_(5)and Pt^(δ+)-NiO/TiO_(2)showed outstanding activity for the hydrogenolysis of benzyl phenyl ether with>99%yield of phenol and toluene due to the excellent cooperation of atomically dispersed Pt and NiO clusters.The synergy mechanism between Pt and Ni and their respective roles in the bimetallic catalyst for C–O hydrogenolysis were clearly clarified.These findings deepen our understanding of the synergy of the two active components and are expected to provide new design concepts for the development of multicomponents catalysts.展开更多
Selective hydrodeoxygenation of biomass-derived aromatic alcohols to value-added chemical or fuel is of great importance for sustainable biomass upgrading,and hydrodeoxygenation of 5-hydroxymethylfurfural(HMF)to 2,5-d...Selective hydrodeoxygenation of biomass-derived aromatic alcohols to value-added chemical or fuel is of great importance for sustainable biomass upgrading,and hydrodeoxygenation of 5-hydroxymethylfurfural(HMF)to 2,5-dimethylfuran(DMF)is one of the most attractive reactions.Achieving the conversion of HMF to DMF using H_(2)at ambient temperature is challenging.In this work,we used PdCu nanoalloys to catalyze the selective hydrodeoxygenation reaction of HMF to DMF using H_(2)as the reducing agent.The reaction path and the product selectivity are governed by the crystallographic phase of the PdCu nanoalloys.It was discovered that body-centered cubic(BCC)PdCu nanoalloys supported on activated carbon(AC)exhibited outstanding performance with 93.6%yield of DMF at room temperature(PdCu/AC-BCC).A combination of experimental and density functional theory(DFT)studies showed that the tilted adsorption modes of furanic intermediates on PdCu-BCC nanoalloy surfaces accounted for the high selectivity of DMF;however,furan ring was activated on PdCu face-centered cubic(FCC)nanoalloy surfaces.Furthermore,PdCu/AC-BCC could also catalyze the hydrodeoxygenation of other aromatic alcohols at room temperature while maintaining the aromatic structures.This work opens the way for selective hydrodeoxygenation of the aromatic alcohols at room temperature with the aromatic ring intact.展开更多
文摘In this study, 22 leaf samples of 22 Lilieae species were collected in six Province at 90 - 3740 m to study the variations of leaf characteristics with altitude change. The Qualitative character of leaf epidermis and two stomatal indexes, viz. stomatal area (SA), stomatal index (SI), were analyzed in laboratory. The results show that: 1) the shape of the leaf epidermis cells and the pattern of the anticlinal walls provide some useful taxonomic information to distinguish the genus, however, none of the stable traits are exclusive to a genus;2) there are significant or even very significant linear correlations between the two indexes and altitude, of which SA exhibit a negative correlation with altitude (r<sup>2</sup> = 0.294, p = 0.009), while SI exhibit a positive correlation with altitude (r<sup>2</sup> = -0.254, p = 0.017). As a result, the pattern of leaf cells and anticlinal walls is influenced by genetic factors, while the stomatal area and stomatal index are influenced by environmental factors. Members of the tribe Lilieae have a relatively stable elevation range, which is related to their long-term adaptation to the local environment in the structure of their leaf epidermis.
文摘Lilium nepalense D. Don is an ornamental plant and exhibits high morphological variation across its distribution range in China. There is incongruence between different data sets for the status of it in Lilium. In this study, we reported a complete chloroplast genome of L. nepalense sampled in Hengduan Mountains, China. The whole chloroplast genome possessed a total length of 152,206 bp with typical circular structure, and contained a large single copy (LSC) of 81,854 bp and a small single copy (SSC) of 17,563 bp, which were separated by a pair of inverted repeats (IRa/IRb) of 26,399 bp. The average GC content among the whole chloroplast genome sequence was 37%, and the GC content in LSC, SSC, IRs regions were 34.8%, 30.6%, and 42.5%, respectively. There were 135 genes detected from the whole chloroplast genome sequence, including 89 protein-coding genes, 38 tRNAs, and 8 rRNAs. Phylogenetic results using maximum likelihood and Bayesian methods showed congruent results that L. nepalense together with the other two L. nepalense samples collected from different habitats formed a single branch, indicating a close relationship of L. nepalense with L. taliense belonging to the section Sinomartagon. This newly characterized chloroplast genome will provide essential data for the further population genetics research of L. nepalense.
基金supported by the National Key Research and Development Program of China(grant no.2022YFA1504901)the National Natural Science Foundation of China(grant nos.22003069,22293012,22179132,22072157,22121002,and 22302209).
文摘C–Obond activation is a highly efficient,fundamental strategy in the depolymerization and hydrodeoxygenation of chemicals with oxygen-containing functional groups such as oil,coal,and biomass.Developing efficient catalysts for C–Oactivation with ultralow-loading noble and non-noble metals is highly desirable for the improvement of metal atomic utilization.Herein,bimetallic catalysts with atomically dispersed Pt and NiO clusters on different supports were fabricated,and the prepared Pt^(δ+)-NiO/Nb_(2)O_(5)and Pt^(δ+)-NiO/TiO_(2)showed outstanding activity for the hydrogenolysis of benzyl phenyl ether with>99%yield of phenol and toluene due to the excellent cooperation of atomically dispersed Pt and NiO clusters.The synergy mechanism between Pt and Ni and their respective roles in the bimetallic catalyst for C–O hydrogenolysis were clearly clarified.These findings deepen our understanding of the synergy of the two active components and are expected to provide new design concepts for the development of multicomponents catalysts.
基金supported by the National Natural Science Foundation of China(21871277,22003069,21725301,21932002)National Key Research and Development Program of China(2017YFB0602200)Beijing Municipal Science&Technology Commission(Z191100007219009).
文摘Selective hydrodeoxygenation of biomass-derived aromatic alcohols to value-added chemical or fuel is of great importance for sustainable biomass upgrading,and hydrodeoxygenation of 5-hydroxymethylfurfural(HMF)to 2,5-dimethylfuran(DMF)is one of the most attractive reactions.Achieving the conversion of HMF to DMF using H_(2)at ambient temperature is challenging.In this work,we used PdCu nanoalloys to catalyze the selective hydrodeoxygenation reaction of HMF to DMF using H_(2)as the reducing agent.The reaction path and the product selectivity are governed by the crystallographic phase of the PdCu nanoalloys.It was discovered that body-centered cubic(BCC)PdCu nanoalloys supported on activated carbon(AC)exhibited outstanding performance with 93.6%yield of DMF at room temperature(PdCu/AC-BCC).A combination of experimental and density functional theory(DFT)studies showed that the tilted adsorption modes of furanic intermediates on PdCu-BCC nanoalloy surfaces accounted for the high selectivity of DMF;however,furan ring was activated on PdCu face-centered cubic(FCC)nanoalloy surfaces.Furthermore,PdCu/AC-BCC could also catalyze the hydrodeoxygenation of other aromatic alcohols at room temperature while maintaining the aromatic structures.This work opens the way for selective hydrodeoxygenation of the aromatic alcohols at room temperature with the aromatic ring intact.
