云南马兜铃属的修订

本文报道了云南马兜铃属一新种和二个新纪录种,并归并了三个种。     

云南西双版纳植物区系新资料

<正> 多年生草本,茎细长而匍匐,节上生根。叶片膜质,近圆形或肾形,长0.5—1.5厘米,宽0.7—2.5厘米,基部心形,5—7裂,裂片阔倒卵形,边缘有钝齿,掌状脉6—8,上面疏生明显的刺状毛,下面光滑;叶柄长0.7—3厘米,无毛;托叶小,薄膜质,近肾形,具不规则的浅裂。聚伞状伞形花序通常顶生,与叶对生,有花序2—3,花序梗纤细,两侧的花序梗长达1厘米,中间的花序梗仅长1—2毫米,小总苞披针形,长约1毫米,膜质,小伞形花宇有花2—5,花无柄,花瓣卵形,长约0.5     

Raphiocarpus jinpingensis,a New Species of Gesneriaceae in Yunnan,China

Raphiocarpus jinpingensis WH. Chen & YM. Shui, a new species of Gesneriaceae, is described and illustrated, from the Xilong Mountain of Jinping County in Yunnan, China, bordering to North Vietnam. The new species is similar as Rpetelotii (Pellegr.) Burtt in shapes of corolla and yellowish flowers, and differs from Rpetelotii mainly in its plants with dense pubescence and calyx tubes subequal to calyx lobes.Its pollen grains and seeds are reported here under Scanning Electonic Microscope (SEM).     

拟纤枝真藓(Bryum petelotii)的地理新分布与分类地位探讨

报道了中国大陆新记录种——拟纤枝真藓(Bryum petelotii Thér.et Henr.)在贵州、云南的分布;描述了本种的形态特征和地理分布,并讨论了本种与相近种真藓(Bryum argenteum Hedw.)和纤枝短月藓［Brachymenium exile(Doz.et Molk.) Bosch et Lac.］的关系;基于文献和相关标本的研究,阐述并讨论了Ochi H.和B.C.Tan等关于该种分类地位的观点,并赞同将拟纤枝真藓置于真藓属(Bryum Hedw.)的观点。     

中国叉柱花属(爵床科)二新记录种————中越叉柱花、密花叉柱花

确定爵床科Acanthaceae叉柱花属Staurogyne的中越叉柱花S. petelotii Benoist和密花叉柱花S. vicina Benoist为中国新记录。     

Camellia nitidissima与C.petelotii之间的关系研究——来自nrDNA ITS的证据

通过对 Camellia nitidissima Chi和 Camellia petelotii (Merr.) Sealy的核糖体 DNAITS区序列进行分析 ,结果表明两者的 ITS区序列存在一定的差异 ,Camellia nitidissima与Camellia tunghinensis,Camellia limonia和 Camellia pingguoensis的亲缘关系比与 Camelliapetelotii的关系更近 ,说明两者是相互独立的种。     

金花茶花药愈伤组织的体细胞减数分裂

金花茶的小孢子单核期花药,经培养的继代培养６个月后的愈伤组织中,发现有少量体细胞进行减数分裂。在减数第一和第二次分裂中,同源染色体的配对和分离基本正常,最后形成四分体。该愈伤组织经石革切片和压片观察,发现其主要由大量的液化细胞和贮藏细胞所组成,此外,还有少部分分生细胞。没有发现进一步的分化。其染色体数目,２ｎ＝３０者占７１．７％,其余则为非整倍体。     

Five New Oleanane Triterpene Saponins from Camellia petelotii and Their Alpha-glucosidase Inhibitory Activity

Five new triterpenoid glycosides, named campetelosides A–E ( 1–5 ), together with three known compounds, chikusetsusaponin IVa ( 6 ), umbellatoside B ( 7 ), and silvioside E ( 8 ) were isolated from the leaves of Camellia petelotii (Merr.) Sealy. Their chemical structures were determined by interpretations of HR-ESI-MS and NMR spectra. In addition, compounds 1–8 were evaluated for their α-glucosidase inhibitory effects. Compounds 1–3 significantly showed α-glucosidase inhibitory activity with IC₅₀ values of 166.7±6.0, 45.9±2.6, and 395.3±10.5 μM, respectively, compared to that of the positive control, acarbose, with an IC₅₀ value of 200.4±10.5 μM.