Two new C21 steroids from Lepidogrammitis drymoglossoides (Bak.) Ching

Two new compounds lepidodromos A-B and (1-2) have been isolated from the methanol-soluble extract of the aerial parts of Lepidogrammitis drymoglossoides (Bak.) Ching (Family: Polypodiaceae) and their structures were determined by 1D, ²D NMR, and HR-ESI–MS. The comparisons of experimental and calculated CD curves were used to determine their absolute configurations. The antiproliferative test indicated that both compounds 1-2 displayed moderate biological activity against Hela cells with IC₅₀ values of 17.8 and 20.4 μM, respectively.     

云南水龙骨科隐子蕨亚科植物区系地理研究

对云南水龙骨科隐子蕨亚科植物的区系地理进行了研究。云南水龙骨科隐子蕨亚科植物的地理成分已进行了划分,与邻近地区的区系联系也进行了比较,其区系起源也作了探讨。结果表明(1)云南是中国水龙骨科隐子蕨亚科植物的现代地理分布中心;(2)云南至喜马拉雅地区是水龙骨科隐子蕨亚科植物区系的分化中心;(3)云南水龙骨科隐子蕨亚科植物区系与四川、喜马拉雅地区和西藏的区系联系最密切;(4)水龙骨科隐子蕨亚科植物的起源中心可能在亚洲热带地区,但其分化中心则可能在云南西北部至喜马拉雅地区。最后列出云南水龙骨科隐子蕨亚科植物的系统名录。     

Flavonoid and ceroptin pigments from frond exudates of Pityrogramma triangularis

Two chemically distinct golden-yellow flavonoid exudates occur on the underside of fronds of Pityrogramma triangularis: ceroptin and a newly described flavonol, 6-methyl-8-methoxy-3,5,7-trihydroxyflavone were detected in one of the exudates and two methylated kaempferol derivatives, 4′-methoxy-3,5,7-trihydroxyflavone and 3,5-dihydroxy-7,4′-dimethoxyflavone were isolated from the other.     

山东水龙骨科植物孢粉学研究及其在分类上的意义

基于Flora of China采用国际石松类和蕨类植物新分类系统,其水龙骨科(Polypodiaceae)不仅涵盖了秦仁昌分类系统中的水龙骨科(Polypodiaceae) 20多属,而且还包括槲蕨科(Drynariaceae)、鹿角蕨科(Platyceriaceae)等独立的科。水龙骨科(Polypodiaceae)新分类系统种类较多、分类复杂,需要对其合理性和孢粉学在新分类系统中的意义进行新的探讨。该文首次以新分类系统为依据,采用扫描电镜对山东分布的水龙骨科(Polypodiaceae)植物孢子形态及其周壁纹饰亚显微结构进行了系统地观察。结果表明:该科孢子形态为圆肾形,左右对称,具周壁,其周壁纹饰在种内稳定,在亚科、属及种间区别显著。孢粉学研究结果,支持槲蕨亚科、鹿角蕨亚科分别列于水龙骨科下的两个亚科;基于山东假瘤蕨孢子周壁纹饰,并结合叶片形态特征,山东假瘤蕨(Phymatopteris shandongensis J.X.Li et C.Y.Wang)应为一个独立的新种,不宜并入金鸡脚假瘤蕨[Phymatopteris hastata (Thunb.) Pic.Serm.]。依据《国际植物命名法规》和Flora of China分类系统,山东假瘤蕨(Phymatopteris shandongensis J.X.Li et C.Y.Wang)新组合为山东假瘤蕨[Selliguea shandongensis (J.X.Li et C.Y.Wang) J.X.LiX.J.Li,comb.nov.]。该研究结果不仅首次为水龙骨科植物孢粉学积累了新资料,而且也为其新分类系统提供了孢粉学的科学依据,与DNA分类系统相吻合,证明其新分类系统的合理性和科学性,在构建水龙骨科及其亚科的自然分类系统中具有重要意义。     

假瘤蕨属（水龙骨科）植物叶表皮特征的比较研究

在光镜和扫描电镜下观察了假瘤蕨属2系、5亚系的24种植物的叶表皮。结果表明,叶表皮细胞形状不规则,垂周壁波曲状。下生气孔,气孔类型有极细胞型、共环极细胞型、腋下细胞型、聚腋下细胞型和不规则型,常伴生出现。在扫描电镜下,叶表皮气孔器外拱盖内缘为浅波状、少平滑;一些种的保卫细胞两端有“T”型加厚;角质膜波状有条纹,有时附有颗粒。叶表皮的一些特征对该属部分种的区分有一定的参考价值。叶表皮的微形态特征,如气孔器类型和垂周壁类型特征不能用来界定假瘤蕨属的系和亚系。     

Ecdysteroids from the medicinal fern Microsorum scolopendria (Burm. f.)

Fronds of the fern Microsorum scolopendria are widely used in traditional medicine in the Society Islands. They were investigated for the presence of ecdysteroids, which might be responsible for at least some of their medicinal properties. M. scolopendria represents an excellent source of ecdysone (0.16% of dry weight) and 20‐hydroxyecdysone (0.20%), and also contains significant amounts (0.01–0.02%) of makisterones A and C, inokosterone and amarasterone A, together with lower amounts of poststerone and of a compound tentatively identified as 24,28‐diepi‐cyasterone. During this study, three new minor phytoecdysteroids, namely 20‐deoxymakisterone A, a 25(?)‐epimer of amarasterone A and 25‐deoxyecdysone 22‐glucoside were also isolated by a combination of normal‐ and reversed‐phase HPLC and subsequently identified by NMR. Copyright © 2007 John Wiley & Sons, Ltd.     

北京水龙骨科孢子形态的研究

利用光学显微镜和扫描电子显微镜对北京产水龙骨科２属４种孢子进行了详细观察,对每个种的形态特征进行了描述。讨论了各属、种间的差异,为水龙骨科系统分类及孢粉学研究提供资料。     

Study on the Spore Morphology of Subfam. Polypodioideae ( Polypodiaceae) in Yunnan,China

The spores of 8 species and 1 variety belonging to 4 genera of Polypodiaceae subfam. Polypodioideae in Yunnan, China were examined under LM and SEM. Of the species it is the first time to study the spores of Metapolyp odium manmeiense and Polypodiastrum mengtzeense under SEM. The results show that the spores of this subfam. Polypodioideae are morphologic uniform; they are monolete, bilaterally symmetric, ellipsoidal in polar view, bean- shaped in equatorial view, and with or without perispore. The surface ornamentation is regularly verrucate. In addition, the relationship of the spore morphology and taxonomy in Polypodiaceae subfam. Polypodioideae was discussed in this paper, providing more informative data for the systematics and palynology of Polypodiaceae.