安诺兰无菌播种组培快繁技术研究

安诺兰(Anota hainanensis)种子无菌播种试验表明:在MS+6-BA 0.1 mg/L培养基上种子能形成原球茎团;1/2 MS培养基有利于原球茎增殖,加6-BA 1.0 mg/L+NAA 0.1 mg/L原球茎增殖效果较佳,增殖率达793.3%;在1/2 MS+IBA 1.0 mg/L+2.0 g/L活性碳+100 g/L香蕉匀浆+100 ml/L椰子水的培养基上,试管苗生根效果最好;试管苗移栽至椰糠上,成活率达91.4%。     

中国细指苔属一新种

植物体纤细,黄绿色,交织丛生,茎长1~1.6 cm,匍匐生长,不规则分枝,枝长约0.2~0.6 cm。茎横切面直径约168 μm,表皮细胞12个,近圆形,中央细胞40~48个。     

阔鳞瘤蕨(水龙骨科)配子体形态发育的研究

利用光学显微镜详细观察记录了阔鳞瘤蕨孢子萌发、配子体发育及幼孢子体形成的整个形态发育过程。结果表明:成熟孢子黄色,极面观椭圆形,赤道面观肾形,近极单裂缝,表面具大小不一的球形颗粒。接种后6~8 d孢子萌发,萌发类型为书带蕨型,形成3~7个细胞的丝状体。原叶体发育为槲蕨型,接种后30 d左右进入片状体阶段,毛状体出现在片状体形成之后,幼原叶体短舌状,成熟原叶体心脏形。精子器在接种后60 d左右开始产生,颈卵器在精子器发生后10 d左右形成,每个原叶体上只能形成一个受精卵。培养基培养的片状体常在基部进行营养繁殖。     

Studies on the Alkaloids of Alseodaphne hainanensis Merr

Six alkaloids were isolated from the stem of Alseodaphne hainanensis Merr. (Lauraceae) collected in Hainan Island. Four of them were identified as xylopinine, armepavine, doryafranine, and 1-(4-methoxybenzyl)-6,7-methylenedioxy-l,2,3,4-tetrahydroisoquinoline by means of spectral analysis and comparison of physico-chemical constants.     

Notes on the Genus Prismatomeris Thw. (Rubiaceae) of China

In the classification of J. D. Hooker (1873) and of K. Schumann (1891), the genus Prismatomeris Thw. is included in the tribe Morindeae of Rubiaceae. In the modern classifications, e. g. Bremekamp (1966), however, the taxonomic position of the genus is still uncertain. The genus agrees with the tribe Morindeae in the downward radicle, valvate aestivation of the corolla lobes and presence of raphides, but it differs significantly from the latter in the free flowers, bilocular ovary and the peltate ovule attached to the upper half of septum. Therefore, it would be more suitable that the genus is separated from the tribe Morindeae Miq., and is raised to the rank of tribe, placed in the subfamily Rubioideae based on Bremekamp’s delimitation. In the present paper ten character pairs of the genus and the notes on their taxonomic value are presented and two following species are recognized: 1. P. tetrandra (Roxb.) K. Schum. is found in northern India. Its subspecies, which is distributed in Yunnan of China and in Thailand, was previously called P. tetrandra (Roxb.) K. Schumann, and is now revised as P. tetrandra (Roxb.) K. Schum. subsp. multiflora (Ridley) Y. Z. Ruan. 2. P. connata Y.Z. Ruan is described as a new species, that has been treated as P. tetrandra (Roxb.) K. Schum. by previous auth rs. It is native to the subtropic region of South China. Its tropical new subspecies, P. connata. Y. Z. Ruan subsp. hainanensis Y. Z. Ruan, is found on Hainan Island.     

A Supplement to the Chloranthaceae of China

In the present paper the longstanding confusion of three uncertain species of Chloranthus, C. monostachys R. Br., C. pernyanus Solms-Laub. and C. kiangsiensis Metcalf is clarified. In addition to the new record of C. nervosus Coll. et Hemsl. to the flora of China, the distributional ranges of Sarcandra hainanensis (Pei) Swamy et Bailey and Hedyosmum orientale Merr. et Chun are also found to be much bigger than previously known.     

海南凤仙花与龙州凤仙花花的形态补充描述

凤仙花属植物的花部形态历来是该属的属下划分及种间界定的关键性状,基于大量的有花标本及野外实地调查,并参照了模式标本对海南凤仙花和龙州凤仙花的花部形态进行了补充描述。     

海南大风子营养成分分析

对植物海南大风子的营养成分进行了分析,结果表明,海南大风子中含有多种营养成分,丰富的矿质元素和维生素及β-胡萝卜素.海南大风子中至少含有17种氨基酸.旨在为开发利用海南大风子的植物资源提供科学依据.     

海南苏铁种群结构与森林群落郁闭度的关系

海南苏铁(Cycas hainanensis)是古老的苏铁属植物, 为国家Ⅰ级重点保护植物, 也是IUCN红色名录的濒危物种。为研究海南苏铁在海南昌江保梅岭省级自然保护区的种群结构与森林郁闭度的关系, 本文通过样方法对海南苏铁种群及其所在群落进行调查, 分析了其群落结构和物种多样性, 以及其种群密度、年龄结构、存活曲线、空间分布格局与森林郁闭度的关系。结果表明: 海南苏铁所在群落垂直结构分为乔木上下2层、灌木层和草本层。海南苏铁所在群落物种多样性指数偏高, 群落内物种组成丰富; 各样方内海南苏铁数量分布不均, 经常群生于海拔500 m左右的林下、林缘间。海南苏铁种群结构属于增长型, 种群更新力强, 种群存活曲线趋近于Deevey-II型, 死亡率随着龄级增加而增加, 说明海南苏铁种群处于相对稳定的状态, 随着种群个体的生长发育, 其生存力逐渐下降; 海南苏铁种群空间分布格局呈聚集型, 聚集程度指标随着林分郁闭度变大而增加。曲线估计结果显示, 海南苏铁幼苗幼树在透光率36.11%-58.33%显著增加。综上所述, 昌江保梅岭地区的海南苏铁种群处于较为稳定的增长状态, 喜生长于海拔500 m左右、郁闭度为35%-60%的森林环境中。