Notes on the genus Ardisia (Myrsinaceae) from Thailand

Ardisia dawnaea is for the first time reported from Thailand; a new combination: Ardisia sanguinolenta var. paralleloneura is made; two names: Ardisia dawnensis and Ardisia undulatodentata are reduced to synonymy, and some confused or misidentified species of Ardisia are clarified.     

Reduction of the genus Parardisia (Myrsinaceae)

The genus Parardisia is shown to be synonymous with the large pantropical genus Ardisia . The species on which Parardisia was based, A. involucrata , should therefore retain that original name. The only other species assigned to Parardisia, P. gamblei , is reduced to synonymy with Ardisia moultonii; both were described (and still known only) from Sarawak. The first species retains its position in Ardisia subgenus Tinus , while the latter belongs in subgenus Tinopsis .     

广西紫金牛属野生观赏植物的综合评价

利用层次分析法,综合观赏价值、资源开发潜力、生物学特性三大约束因素共14个指标,对分布于广西的29种紫金牛属野生观赏植物进行综合评价。结果表明:按照开发利用价值的高低,可将29个种(变种)根据轻重缓急划分为4个等级,其中:Ⅰ级:开发利用价值高的种类,5个;Ⅱ级:开发利用价值较高的种类,9个;Ⅲ级:开发利用价值一般的种类,9个;Ⅳ级:开发利用价值较低的种类,6个。研究结果将为科学、合理地开发利用广西紫金牛属野生观赏植物资源提供决策依据。     

缅甸紫金牛属新记录

报道了缅甸克钦邦分布的报春花科(Primulaceae)紫金牛属(Ardisia Swtarz)的3 新记录种:伞形紫金牛(Ardisia corymbifera Mez)、珍珠伞(Ardisia maculosa Mez)和Ardisia interjacens C. M. Hu & J. E. Vidal。     

中国和越南紫金牛科植物新种及混淆种类的澄清

在编写《柬埔寨、老挝、越南植物志》紫金牛科的过程中,作者对我国紫鑫牛科植物也作了进一步的检查和整理,共发现Ardisia waitakii,A. linangensis,A. malipoensis, A. crassirhiza, Maesa consanguinea var. confusa 等5个新类群,归并了Ardisia elegantissima Leveille, A. glanea Mez,A. corgmbifera var. tuberifera C. Chen, A. kwangtungensis Walker和 Maesa prodigiosa C. Chen,同时澄清了部分长期混淆或被错误鉴定的种类。     

中国紫金牛属圆齿组花粉形态研究及其分类学意义

利用扫描电子显微镜对紫金牛属圆齿组20种1变种植物的花粉形态进行了研究,并比较分析了腋序组2种及锯齿组1种的花粉。经观察花粉为近球形或近扁球形,具3孔沟,除锯齿组的月月红外,其余种均形成合沟。外壁纹饰可分为四类:穴网状、细网状、皱波状及细颗粒状(带刺突)。结果显示,花粉形态特征可作为属下分组及组下分类处理的依据。     

Trichome forms in Ardisia (Myrsinaceae) in relation to the bacterial leaf nodule symbiosis

Symbiotic leaf-nodule bacteria in nodulated members of Rubiaceae live in mucilage secreted by colleters located on stipules within buds. These differ from colleters on most nodule-free species. This study was undertaken to examine buds of Ardisia and the related monotypic Amblyanthus of Myrsinaceae to see if nodulated species had secretory structures dissimilar from those of nodule-free species. Buds removed from herbarium specimens (61 species) and live plants (3 species) were paraffin-sectioned. Diverse trichome forms occur, including dimorphism between adaxial and abaxial trichomes in some species. Species within each subgenus were arranged according to trichome form: peltate scale, irregularly capitate, capitate, sessile capitate, bicellular capitate, and uniseriate. Only seven Ardisia species (all in subgenus Crispardisia, widely assumed to have bacteria in marginal leaf nodules of all 30 species) have short-lived trichomes bearing one or more elongate, swollen, distal cells that appear to be secretory cells. These trichomes are analogous to the dendroid or brushlike colleters of nodulated Rubiaceae. Druses occur in most subgenera and this appears to be by far the most predominant crystal type m Ardisia.     

广东植物分布新记录

报道广东植物分布新记录9种：毛杆蕨、棒花风仙、海南地黄连、线状紫金牛、纽子果、长苞蓝、簇花球子草、光叶球穗山姜和黄花羊耳蒜。其中毛杆蕨属和长苞蓝属为广东新记录属。     

Rediscovery of Ardisia gigantifolia and the reinstatement of A. kteniophylla (Primulaceae) – finding the correct name for the Chinese medicinal plant ’Zou Ma Tai’

With the rediscovery of Ardisia gigantifolia, the long‐standing confusion with A. pseudoverticillata, A. kteniophylla and A. dasyrhizomatica owing to the misinterpretation of the type of A. gigantifolia is clarified. It is shown that A. dasyrhizomatica is a later synonym of A. gigantifolia, while A. kteniophylla and A. pseudoverticillata are conspecific and represent another species for which A. kteniophylla is the earliest name available. Ardisia kteniophylla is the correct scientific name for the Chinese medicinal plant ’Zou Ma Tai’.     

珠三角地区几种耐荫耐旱乡土地被植物的园林应用

通过在珠三角地区的广州白云山、肇庆鼎湖山、深圳梧桐山、惠州南昆山、东莞银屏山、东莞水濂山等6处选取样方进行实地调查,并采用线性加权综合法数学模型对珠三角地区野生地被植物作综合评价。结果表明,依据植物的生活型、生境、高度等特性初步确定该地区乡土地被植物70种,重点推荐紫金牛Ardisia japonica、东方紫金牛Ardisia squamulosa、马蓝Strobilanthes cusia等8种乡土耐荫耐旱地被,其在东莞植物园的配置应用实践中,均表现出极好的耐荫性和耐旱性,且扩繁较易。     

Genetic variation of Ardisia crenata in south China revealed by nuclear microsatellite

Ardisia crenata Sims,one of the most widely distributed Ardisia in the world,is an important ornamental and medicinal plant species.Using seven polymorphic nuclear microsatellite loci,we studied the genetic variation of 20 natural populations of A.crenata across its distribution center in south China.Significant deviation from the Hardy-Weinberg equilibrium in all populations and at all loci were detected,and the fixation index was high(FIS = 0.725),indicating that inbreeding may be dominant in the mixed mating system of this self-compatible species.The average genetic diversity within populations was relatively low(HS = 0.321).There was significant genetic differentiation among populations(FST = 0.583),which may have resulted from a high level of inbreeding and a low level of gene flow.Ardisia crenata in south China can be roughly divided into an eastern group and a western group,consistent with the floristic division of the Sino-Himalayan forest subkingdom and the Sino-Japanese forest subkingdom.There may be separated glacial refugia in each region.     

广西木荷林的分类和演替

木荷（ＳｃｈｉｍａｓｕｐｅｒｂａＧａｒｄｎ．ｅｔＣｈａｍｐ．）林是原来的常绿阔叶林遭受破坏以后,在保护较好的情况下,从演替系列群落顺向演替恢复为常绿阔叶林的一个早期类型。本文对广西木荷林进行分类,划分和论述７个群丛的种类组成特点和演替方向,可供进一步研究和规划退化生态系统的恢复和重建参考     

亚热带季风阔叶林不同林地几种植物光合作用的比较研究

比较了亚热带季风阔叶林不同林地几种植物的叶特性、叶含氮量、叶绿素含量、光合速率和气孔对CO_2的传导率,表明疏林的桃金娘(Rhodomyrtus tomentoso)和荷树(Schima superba)的叶厚和栅栏组织厚度较九节(Psychotria rubra)小,但单位面积干重较九节大,叶含氮量(N mg/g干重)较密林的罗伞(Ardisia quinquegona)低,疏林的桃金娘和荷树的光合作用饱和光强为600和550 μmol 光量子m~(-2),S~(-1),光补偿点分别为12和20 μmol,光量子m~(-2),s~(-1),两种植物的平均最大光合速率分别为11.9±0.4和7.5±1.8 μol CO_2,m~(-2),S~(-1),光合量子产率分别为0.056和0.048,而密林的罗伞光合速率变化对光强变化反应敏感,暗呼吸速率较低。光补偿点为5μmol,光量子m~(-2),S~(-1),显著低于疏林植物,疏林植物有着较高的Ci/Ca值和水分利用效率。亚热带季风阔叶林的不同林地的植物有着不同的光合作用特性,这可能与植物生境的光状况有关。     

三种紫金牛属植物的核型研究

对紫金牛属三种植物进行了核型分析,其中朱砂根染色体数目2n=46、核型2n=46=42m+2sm+2st和紫金牛核型2n=92=58m+24sm+10st为首次报道;虎舌红核型公式为2n=44=40m+2sm+2st。核型分析结果显示,紫金牛属植物存在染色体数目非整倍体变异及多倍化的进化方式。     

Structure and function of trichornes in the shoot tip of Ardisia crispa (Thunb.) A.DC. (Myrsinaceae)

MILLER, I. M., GARDNER, I. C. & SCOTT, A., 1984. Structure and function of trichomes in the shoot tip of Ardisia crispa (Thunb.) A.DC. (Myrsinaceae). The trichomes in the shoot tip of the myrsinaceous leaf-nodulated species Ardisia crispa (Thunb.) A.DC. have been studied at the ultrastructural level. Two distinct kinds of trichomes are found. Small peltate scales arise from the abaxial protoderrn of the developing leaves. Multicellular stellate trichomes on the adaxial surface of young leaves are uniseriate, rotate and consist of up to eight multicellular arms radiating from a central stalk. The multicellular arms terminate distally in swollen club-shaped tips. The stellate trichomes secrete large quantities of carbohydrate-containing mucilage. Colonies of leaf nodule bacteria are found resident in this mucilage. The role of the peltate scales and the stellate trichomes n the maintenance of the cyclic leaf nodule symbiosis is discussed.     

The fine structure of the leaf nodules of Ardisia crispa (Thunb.) A.DC. (Myrsinaceae)

The fine structure of the leaf nodules of Ardisia crispa is described. The bacterial endophyte in mature nodules is extracellular, forming a compact mass which is encompassed within a 5–6 cell thick sheath of modified mesophyll cells. Processes from these sheath cells invade the bacterial mass providing a host surface across which exchange of metabolites may take place. Considerable pleomorphism is exhibited by the bacteria, paralleling that found in other symbiotic associations in which the host can influence the morphology of the microsymbiont. The spherical, highly granate chloroplasts, rich in starch, which are characteristic of the spongy mesophyll leaf cells, are replaced, in the modified sheath cells, by a degenerate plastid form containing membrane whorls. Lipid reserves appear to replace the starch in the sheath cells. The significance of these changes is discussed.     

The fine structure of the leaf nodules of Ardisia crispa (Thunb.) A.DC. (Myrsinaceae)

The fine structure of the leaf nodules of Ardisia crispa is described. The bacterial endophyte in mature nodules is extracellular, forming a compact mass which is encompassed within a 5–6 cell thick sheath of modified mesophyll cells. Processes from these sheath cells invade the bacterial mass providing a host surface across which exchange of metabolites may take place. Considerable pleomorphism is exhibited by the bacteria, paralleling that found in other symbiotic associations in which the host can influence the morphology of the microsymbiont. The spherical, highly granate chloroplasts, rich in starch, which are characteristic of the spongy mesophyll leaf cells, are replaced, in the modified sheath cells, by a degenerate plastid form containing membrane whorls. Lipid reserves appear to replace the starch in the sheath cells. The significance of these changes is discussed.     

九龙山濒危植物南方铁杉的生态位研究

采用生态位理论研究了南方铁杉在九龙山群落中的地位。结果表明：乔木层中,南方铁杉（Tsuga tchekiangensis）、猴头杜鹃（Rhododendron simiarum）、木荷（Schima superba）生态位宽度较大,它们之间的生态位相似性比例值较高,生态位重叠值较大;灌木层中,南方铁杉、猴头杜鹃、朱砂根（Ardisia crenata）、木荷、三角枫（Acer buergerignum）的生态位宽度较大,南方铁杉与这几个树种之间的生态位相似性比例值较高,生态位重叠值较大;这些分析结果为珍稀濒危植物南方铁杉种群数量的扩增具有一定的理论价值。     

西双版纳野象谷景区亚洲象取食作用对五种植物的影响

摘要：本研究在西双版纳利用样线调查法调查亚洲象的取食作用对野象谷景区常见分布的5种植物即酸苔树、象鼻藤、粗糠柴、翅果麻和黄牛木的影响,调查中记录样线上每一目标植株的基径、高度、影响类型、影响程度等信息。结果表明：1）植物受影响的数量与其植株总数之间的相关性不大（Pearson correlation, r=0.608, P=0.277）;2）亚洲象对5种植物的偏爱程度不一样,酸苔树、象鼻藤、粗糠柴和翅果麻都是大象喜爱的食物,尤其是象鼻藤（偏爱指数=1.4855）,而黄牛木不受大象喜爱（偏爱指数=0.5855）;3）亚洲象对5种植物有不同的影响方式和影响程度,酸苔树以主干折断和枝叶损失为主,受大象的取食影响最严重,象鼻藤虽然是大象最喜爱的食物,但受到的取食影响最小,粗糠柴以枝叶损失和主干折断为主,翅果麻以枝叶损失为主,同时也是唯一被亚洲象剥皮的植物,黄牛木以枝叶损失为主,被推倒的情况最普遍。树干基部直径为3-8cm的植株最受大象偏爱。亚洲象对植物的选择性以及植株自身的特性是导致上述差异的主要原因。建议后续开展长期的调查以了解亚洲象对这些植物种群数量及群落结构的影响,同时应采取有效保护措施以避免象群在当地过于集中的现象。