目的:研究黄柏、雷公藤等16种植物粗提液对课题组分离、鉴定和培养的与滇重楼Paris polyphylla Smith var.yunnansensis(Franch.)Hand.-Mazz.根茎腐烂有密切关系的主要害虫小杆线虫Rhabditissp.的毒杀作用。方法:各种植物汁液原液配成1...目的:研究黄柏、雷公藤等16种植物粗提液对课题组分离、鉴定和培养的与滇重楼Paris polyphylla Smith var.yunnansensis(Franch.)Hand.-Mazz.根茎腐烂有密切关系的主要害虫小杆线虫Rhabditissp.的毒杀作用。方法:各种植物汁液原液配成10倍、50倍、100倍、500倍的浓度梯度,用浸液法测试杀线效果。结果:药效试验显示16种植物粗提液均有毒杀效果;马缨丹花叶、万寿菊、杜鹃粗提液在72h后,对小杆线虫的致死率分别为71.4%～92.0%、83.7%～91.4%、73.3～89.0%。结论:植物杀线虫物质的成份和活性不仅与提取的植物种类、部位有关,也与植物新鲜度、粉碎度、提取时间、提取温度、提取液浓度及其作用线虫时间等因素也不同程度地影响着植物杀线虫物质的作用。展开更多
Boehmeria nivea var.strigosa Zeng Y.Wu&Y.Zhao,a new variety of B.nivea(Urticaceae)from Southwest China,is here described based on evidence from morphology and molecular phylogeny.This new variety is mainly charact...Boehmeria nivea var.strigosa Zeng Y.Wu&Y.Zhao,a new variety of B.nivea(Urticaceae)from Southwest China,is here described based on evidence from morphology and molecular phylogeny.This new variety is mainly characterized by its green abaxial leaf blade,partly connate stipules,and densely patent strigose hairs on stems and potioles.The phylogenetic analysis based on rbc L,nrDNA and rbc L+nrDNA datasets,revealed that all individuals of B.nivea var.strigosa formed a monophyletic group.The conservation status of B.nivea var.strigosa is assessed as“Near Threatened”(NT)according to IUCN evaluation criteria.The discovery of this new variety is not only crucial for the taxonomy of ramie,but also provides reference for the exploration and utilization of ramie.展开更多
Elymus duthiei(Melderis)G.Singh,newly recorded from Xizang,China,is described and illustrated in detail.Morphologically,the species is similar to E.anthosachnoides(Keng)Á.Löve ex B.R.Lu and E.glaberrimus(Ken...Elymus duthiei(Melderis)G.Singh,newly recorded from Xizang,China,is described and illustrated in detail.Morphologically,the species is similar to E.anthosachnoides(Keng)Á.Löve ex B.R.Lu and E.glaberrimus(Keng&S.L.Chen)S.L.Chen but differs from the former in height and diameter of culms,number of nodes,width of leaf blades,and type of trichome and size of spikelets,and from the latter in distribution,height of culms,type of trichome of spikelets,and awn length.Detailed photo plates,descriptions,and distribution data are provided.展开更多
Natural product elansolid A belongs to one type of polyketide macrolactone with promising antibiotic activity.Pre-viously,the first total synthesis of elansolid A in 28 longest linear sequence(LLS)and 41 steps in tota...Natural product elansolid A belongs to one type of polyketide macrolactone with promising antibiotic activity.Pre-viously,the first total synthesis of elansolid A in 28 longest linear sequence(LLS)and 41 steps in total has been achieved.Herein,the simplified analog of elansolid A,featured with a cyclohexyl-fused 19-memebered macrolactone,was proposed,and its asymmetric total synthesis based on a convergent strategy and key reactions exemplified by desymmetric alcoholysis of anhydride,Pd-catalyzed Stille coupling,Suzuki-Miyaura coupling as well as Mukaiyama macrolactonization was finished.展开更多
A total of 21 compounds were isolated from the seeds of Capparis masaikai and identified as oxazolidine-2-thione(1), succinimide(2), catechol(3), octathiocane(4), monoethanolamine(5), 3-hydroxypropanenitrile(6), L-ara...A total of 21 compounds were isolated from the seeds of Capparis masaikai and identified as oxazolidine-2-thione(1), succinimide(2), catechol(3), octathiocane(4), monoethanolamine(5), 3-hydroxypropanenitrile(6), L-arabinose(7), 1,2,3-propanetriol(8), drummondol(9), spionoside B(10), adenosine(11), corchoionoside C(12), coniferin(13), syringin(14), cis-syringin(15), dihydrosyringin(16), indole-3-carboxylic acid(17), β-D-glucopyranosyl indole-3-carboxylic acid(18), 6-hydroxyindole-3-carboxylic acid β-D-glucopyranosyl ester(19), linoleis monoglyceride(20), and triolein(21). Their structures were identified based on physicochemical property and spectroscopic analysis, including MS, NMR, and single-crystal X-ray crystallographic data. Compounds 2–10 and 12–21 were isolated from C. masaikai for the first time.展开更多
文摘目的:研究黄柏、雷公藤等16种植物粗提液对课题组分离、鉴定和培养的与滇重楼Paris polyphylla Smith var.yunnansensis(Franch.)Hand.-Mazz.根茎腐烂有密切关系的主要害虫小杆线虫Rhabditissp.的毒杀作用。方法:各种植物汁液原液配成10倍、50倍、100倍、500倍的浓度梯度,用浸液法测试杀线效果。结果:药效试验显示16种植物粗提液均有毒杀效果;马缨丹花叶、万寿菊、杜鹃粗提液在72h后,对小杆线虫的致死率分别为71.4%～92.0%、83.7%～91.4%、73.3～89.0%。结论:植物杀线虫物质的成份和活性不仅与提取的植物种类、部位有关,也与植物新鲜度、粉碎度、提取时间、提取温度、提取液浓度及其作用线虫时间等因素也不同程度地影响着植物杀线虫物质的作用。
文摘Boehmeria nivea var.strigosa Zeng Y.Wu&Y.Zhao,a new variety of B.nivea(Urticaceae)from Southwest China,is here described based on evidence from morphology and molecular phylogeny.This new variety is mainly characterized by its green abaxial leaf blade,partly connate stipules,and densely patent strigose hairs on stems and potioles.The phylogenetic analysis based on rbc L,nrDNA and rbc L+nrDNA datasets,revealed that all individuals of B.nivea var.strigosa formed a monophyletic group.The conservation status of B.nivea var.strigosa is assessed as“Near Threatened”(NT)according to IUCN evaluation criteria.The discovery of this new variety is not only crucial for the taxonomy of ramie,but also provides reference for the exploration and utilization of ramie.
文摘Elymus duthiei(Melderis)G.Singh,newly recorded from Xizang,China,is described and illustrated in detail.Morphologically,the species is similar to E.anthosachnoides(Keng)Á.Löve ex B.R.Lu and E.glaberrimus(Keng&S.L.Chen)S.L.Chen but differs from the former in height and diameter of culms,number of nodes,width of leaf blades,and type of trichome and size of spikelets,and from the latter in distribution,height of culms,type of trichome of spikelets,and awn length.Detailed photo plates,descriptions,and distribution data are provided.
基金Project supported by the High-Level Talent Program of Yunnan Province(No.Y93D321261)the Regional Development Program for Young Scholars,Chinese Academy of Sciences(CAS)(No.E323521311)the Science and Technology Department of Yunan Province(Nos.202305AH34005,202401AS070096)。
文摘Natural product elansolid A belongs to one type of polyketide macrolactone with promising antibiotic activity.Pre-viously,the first total synthesis of elansolid A in 28 longest linear sequence(LLS)and 41 steps in total has been achieved.Herein,the simplified analog of elansolid A,featured with a cyclohexyl-fused 19-memebered macrolactone,was proposed,and its asymmetric total synthesis based on a convergent strategy and key reactions exemplified by desymmetric alcoholysis of anhydride,Pd-catalyzed Stille coupling,Suzuki-Miyaura coupling as well as Mukaiyama macrolactonization was finished.
基金National Science and Technology Major Project(Major New Drug Development,Grant No.2016ZX09101069)。
文摘A total of 21 compounds were isolated from the seeds of Capparis masaikai and identified as oxazolidine-2-thione(1), succinimide(2), catechol(3), octathiocane(4), monoethanolamine(5), 3-hydroxypropanenitrile(6), L-arabinose(7), 1,2,3-propanetriol(8), drummondol(9), spionoside B(10), adenosine(11), corchoionoside C(12), coniferin(13), syringin(14), cis-syringin(15), dihydrosyringin(16), indole-3-carboxylic acid(17), β-D-glucopyranosyl indole-3-carboxylic acid(18), 6-hydroxyindole-3-carboxylic acid β-D-glucopyranosyl ester(19), linoleis monoglyceride(20), and triolein(21). Their structures were identified based on physicochemical property and spectroscopic analysis, including MS, NMR, and single-crystal X-ray crystallographic data. Compounds 2–10 and 12–21 were isolated from C. masaikai for the first time.
