Abstract:There has been the deep discussion between the natural selection theory and the neutral theory for the long time. Presently, the difficult problems exist in the study on the environmental adaptation in the process of molecular evolution in plant populatio

Abstract:Circaeaster was compared with other Ranunculales ( sensu Takhtajan, 1980) based on the morphological data in the present paper. The results were showed as follows. Circaeaster is similar to other Ranunculales in some basic or primary characterist

Abstract:The positive xylem pressure, often occurs with low transpiration rate, is termed as root pressure. Various mechanisms have been suggested for the nature of root pressure. All the explanations can be classified into two major groups: monophasic and bipha

Abstract:The effects of light, sugar and GA s on flower growth and pigmentation were reviewed combining our research, and the probable regulatory mechanisms were mentioned as well. Light controls petal growth and anthocyanin production through photoreceptor media

Abstract:Seeds and developing seedlings of Aconitum kusnezoffii were anatomized to examine vascular development in the root hypocotyl transition region. The seedlings of Glycine max used to study the connection of the xylem from root to shoot. The germi

Abstract:Advances in Sargentodoxa on it's geological distribution, physioecology, morphology and anatomy, classification, chemical constituent were summarized. In addition, some problems needing attention in this field are discussed: (1) The relationship betwe

Abstract:对《西北植物学报》1981～2002年的载文从数量及其年度变化、学科分布、空间分布、著作者情况、基金项目资助情况、引文情况及出版专集情况等7方面进行了文献计量分析。结果表明，《西北植物学报》具有4个鲜明特点：①信息量大，内容新颖，发表论文多为西北地区乃至全国广泛关注的植物学重大科研成果，对西北地区植物科学的发展起到了推动作用；②期刊定位准确，栏目安排合理，具有独特的风格，内容基本涉及植物学各分支学科，且其分布比较均匀合理，是一份植物学综合性学术期刊；⑧作者队伍以西北地区为主体，兼有国内其它省、市、区及海外的研究人员，体现了期刊来稿的广泛性和开放性；④载文多受到国家级及省部级基金项目资助，引文量较大，近期引文率较高，保证了其具有较高的学术质量和研究深度。

Abstract:沙鞭是鄂尔多斯高原流动沙丘上分布的多年生禾草。新采收的种子能够在15～35℃的光照和暗中萌发。在25℃光照下，通过14d的培养，种子的萌发率能够达到80％。在25～35℃温度范围内，种子的萌发在光照下比暗中好。通过低温层积处理表明，沙鞭的种子处于非深度休眠状态。4星期的低温层积处理能够有效地加速和提高种子在20～30℃、光照和暗中萌发。对低温贮藏的需求可能是种子对其生境的适应。另外，划伤颖果的果皮和种皮，以及不同程度地部分移走胚乳也能够不同程度地加速和提高种子的萌发，但幼苗的干重以及根和苗的长度显著地受到了移走胚乳的影响。

Abstract:Onion root tip and human lung fibroblast were exposed to the low frequency magnetic field. The examination of root cell number, fluorescence microscopy and single cell gel electrophoresis were adapted for studying effect of cell biology. The growth of the

Abstract:Vegetative storage proteins in the new shoots of poplar were identified by means of light and electron microscopy. Granular form of vegetative storage proteins was observed in the large central vacuoles of the secondary phloem parenchyma cells and seconda

Abstract:In this study, we systematically investigated the different content of anthraquinones in 3 Aloe plants of different ages and leaf parts. TLC analysis demonstrated that the content of four metabolites, barbaloin, homonataloin, aloenin and and 3 isomers

Abstract:Studies on the morphogenesis and development of rhizome from seedling and the accumulation of dioscin of Dioscorea zingiberensis C. H. Wright have been made in this article. After germination, the knot expands into spheroid whose diameter is about 1.5

Abstract:The nodulation and nitrogen fixation of major cultivated and wild legumes have been studied in northwest arid zone of China. All of cultivated and a few of wild plants can nodulate in nature environment. The shapes of nodules of these plants were circular

Abstract:In this paper, matK gene of the chloroplast DNA was sequenced in representatives of 7 species from the genus Magnolia and 4 species from the genus Michelia . The results indicated that the delimination of Magnolia and Michelia was not c

Abstract:With the methods of histochemistry and phytochemistry, the correlation between the content of gypenosides and its vegetative organs and growth period was studied. The results showed that on the one hand, among different vegetative organs, the content of g

Abstract:The difference of xylem radial growth between scion and stock in the graft union in Hevea brasiliensis was studied by patch grafting (without sawing up the stock shoot above the grafting position)and microscopical observation 8 months after grafting.

Abstract:The paraffin section technique was applied in the study of the initiation and early development of the ovulate strobilus in Pinus massoniana Lamb. from September to April cultivated at the campus of South China Agricultural University.Result is as fol

Abstract:对龙眼(Dimocarpus longan Lour.)花蜜腺的形态结构、发育过程以及蜜腺的组织化学变化进行了较为系统的研究；对花蜜腺结构与泌蜜的关系、泌蜜方式、起源和系统演化等作了初步的探讨。结果表明：龙眼的花盘蜜腺位于花托上，呈环状环绕在雌雄蕊基部外围，花芽分化约30d，在雄蕊和花被之间的花托表面，蜜腺原基也开始形成，由花托表面2～3层细胞脱分化形成居间分生组织发育而来；龙眼花蜜腺由分泌表皮和产蜜组织构成，属结构蜜腺；分泌表皮角质层极薄，密布单细胞绒毛，未发现有气孔；产蜜组织由亚腺细胞、产蜜细胞、油细胞和维管束组成；在蜜腺发育过程中，产蜜细胞的液泡和多糖物质发生有规律的变化；蜜腺的原蜜汁来源于韧皮部，蜜汁经表皮角质层渗出。

Abstract:In this paper, the gynoecial structure of Phytolaccaceae was reported. At the early stage of carpel initiation, there formed an opening carpel which have a mouth at adaxial first, and the mouth was closed at the later by the division and growth of the epi

Abstract:The wood structure of 5 Abies species native to south China including A. ziyuanensis, A. dayuanensis, A. fanjingshanensis, A. yuanbaoshanensis and A. Kawakamii were studied by means of light microscope and scanning electron microscope. Wood an

Abstract:With the help of paraffin section and thin section techniques, the position, morphology, structure and ontogeny of floral nectary in Eruca sativa (Gars.) Mill was studied. The change of the histochemistry of nectariferous tissue before and after exud

Abstract:The change of morpho and developmental process of the root tuber in Rehmannia glutinosa cv. Hueichingensis Hsiao were observed in this paper. The structural development of it was also studied with paraffin section. With the normal planting of R

Abstract:These experiments were carried out at Ansai, Wuqi on semiarid region of the Loess Plateau from 1994 to 2002. The characteristics of morphology and anatomy were observed and studied. The results showed that seabuckthorn leaf has flourishing epidermis hair,

Abstract:With the help of methods of paraffin section and scanning eletron microscopy(SEM),the distribution,shape,structure,occurrence and ontogeny of floral nectaries in Allium tuberosum,Hemerocallis fulva and Iris tectorum were systemctically investigate

Abstract:Hainan and Taiwan are two most important continental islands of south China and east China, with the rather rich fern biodiversity. By research on endemism and disjunction, it could be imply the history of diversity of fern flora and could be reveal the r

Abstract:新会市位于广东省中南部 ,地理位置为北纬 2 2°0 5′4 3″～ 2 2°4 8′2 4″,东经 1 1 2°4 7′0 3″～ 1 1 3°1 5′2 4″,南濒南海 .该地区共有维管植物 1 6 98种 ,隶属于 2 0 9科 81 6属 ,其中蕨类植物 32科 5 4属 82种 ,种子植物 1 78科 76 2属1 6 1 6种 .区系地理学研究表明 :蕨类植物地理成分以热带亚热带分布属居多 ,达 2 6属 ,占蕨类总属数的 4 8.1 3% ,而且是以单种属或少种属占优势 .种子植物地理成分以泛热带、热带亚洲分布占绝对优势 ,全部热带成分已达78.0 9% ;其特征科主要有 :山矾科、冬青科、壳斗科、桑科、金缕梅科、山茶科、樟科、萝摩科、大戟科、蝶形花科、野牡丹科、茜草科等 ;中国特有属杉木属、穗花杉属、石笔木属、四药门花属、马蹄参属、天星藤属、大血藤属、刚毛药花属、台闽苣苔属、酸竹属及广东特有属绣球茜草属、异枝竹属等 .与邻近的香港、惠东古田、鼎湖山和黑石顶的植物区系比较其相似性很高 ,体现出南亚热带地区植物区系成分的过渡性及热带区系的渗透性

Abstract:To aim at the problems on grassland degeneration, serious soil and water loss, and low productivity of grassland and animal husbandry in semi arid loess region, the experimental studies on technology of multidimensional grassland establishment, including

Abstract:The distributing center of Ulmus lamellosa on Huo mountain was set as four stands ,and Zhongtiao mountain was selected to set three stands. 585 plots were investigated by sampling method. Water, organic matter and nitrogen were used as the resource ax

Abstract:采用GC—MS联用技术分析比较垂序商陆根不同提取物的脂溶性化学成分。色谱柱为：DB-5毛细管柱，载气为氦气(1mL／min)，柱温初始温度50℃，先以20℃／min的升温速率升至170℃，再以2℃／min的升温速率升至210℃；质谱用EI离子源。鉴定了8种相对百分含量大于0．5％的化学成分，其中的3种成分(2-甲氧基-4丙烯基苯酚、带状网翼甾醇、邻苯二甲酸二丁酯)与商陆根中的3种脂溶性成分相同；乙醚提取物与CO2超临界萃取物含有的主要化学成分种类相同，但含量不同；石油醚提取物含有的化学成分种类较少，石油醚萃取物所含成分种类相对较多，且两者有较大差异。

Abstract:通过对喜树幼苗中喜树碱含量的分析，发现不同生长期、不同器官中喜树碱的含量不同，幼叶和根中喜树碱的含量较高。虽然喜树中含有对真核细胞具有毒性作用的喜树碱，但仍有12种内生菌从喜树的不同器官中分离出来。内生菌对喜树碱的敏感性实验表明，10μg／mL喜树碱对2种内生菌的生长几乎没有抑制作用，即是100μg／mL浓度的喜树碱对它们的生长抑制也是有限的。

Abstract:The ultrastructure of leaf cells in albino seedlings and normal seedlings of Stachys sieboldii Miq. was observed by ultrathin section and electron microscopy techniques. The results showed that there were distinct differences between ultrastructure o

Abstract:The leaf epidermis of 15 species shrubs living in desert of Helanshan mountain have been observed by SEM. It is found that the cells of both upper and lower epidermis are covered thick corticle and a lot of epidermal hairs, the type of epidermal hair are

Abstract:紫苏花蜜腺位于不均等分裂的花盘裂片上，属于子房基部的盘状蜜腺。3枚小裂片上的蜜腺由分泌表皮和产蜜组织组成，而另一枚大裂片上的指状蜜腺则由分泌表皮、产蜜组织和维管束组成。4枚蜜腺的表皮细胞外均具薄的角质层，仅在指状蜜腺的顶部分布着密集的气孔器。蜜腺来源于花盘表面的2～3层细胞。在蜜腺发育过程中，液泡和淀粉粒呈现有规律的消长变化，这与蜜汁的合成与分泌有关。3枚小裂片蜜腺的原蜜汁来源和泌蜜途径与指状蜜腺不同。

Abstract:It was studies that geographic distribution,habitat, characteristics of biology and ecology of Populus euphration and Populus pruinosa in 6 different populations. The results indicated that abloom phenophase, growth and development extent,output o

Abstract:对翅果油树的无菌苗培养、愈伤组织诱导、继代愈伤组织诱导和生根诱导、褐化现象及预防等进行了研究。结果表明：种子无菌培养的最佳培养基为1／2MS；继代愈伤组织诱导的最佳培养基为N2(MS BA0．5 NAA0．02)、N4(MS BA0．5 NAA0.04)；植物激素类型及浓度配比是生根诱导的关键，NAA、GA、IBA为必需激素类型；用多种途径避免和预防了实验过程中的褐化现象，降低了褐化率；建立了翅果油树组织培养高效再生植株的实验体系。

Abstract:以金银花 蒙花 品系的茎段为外植体 ,于 MS和 B5附加不同激素配比的培养基上 ,探讨愈伤组织形成和丛生芽诱导及生根培养的条件 .诱导愈伤组织和丛生芽的培养基为 B5+BA2 .0 m g· L- 1 +KT0 .2～ 0 .5 mg· L- 1+IAA 0 .5～ 1 .0 mg· L- 1 +L H 1 0 0 0 m g· L- 1 ,继代增殖培养的培养基为 B5+BA 2 .0 m g· L- 1 +KT 0 .5 m g·L- 1 +IAA1 .0 m g· L- 1 +L H1 0 0 0 m g· L- 1和 B5+BA2 .0 mg· L- 1 +KT0 .36 m g· L- 1 +IAA1 .0 mg· L- 1+CH 1 0 0 0 m g· L- 1 +1 / 2 MS :大量元素 ,生根培养基为 1 / 2 MS +IBA 0 .2 mg· L- 1 +L H 1 0 0 0 mg·L- 1 .结果表明 L H和 CH在金银花愈伤组织和丛生芽诱导方面具明显的作用

Abstract:Se Men Cuscuta and its confusion were differentiated by the some methods. The results showed its confusion was the seed of a species Brassica juncea var. juncea .

Abstract:turf grasses varieties suiting for growing in central area of Shaanxi province were selected by studying and analyzing characteristics of several turf grasses varieties, such as phenological phase,cover degree, density, regrowth ratio,quality and propert