Abstract:Using plants possessing stable genetic tolerance/resistance under natural environmental conditions to study the mechanism of plants' adaptation to environmental stress are very significant. However, relevant work is very limited. In this work, two ecotype

Abstract:为了了解牧草低温保护物质与其抗冷冻的关系，在高寒山区测定了几种多年生牧草根中低温保护物质的含量和几种蔗糖酶活力的变化。结果表明，在4月土壤解冻期间，无芒雀麦、花雀麦、垂穗披碱草和草地早熟禾根中的蔗糖含量分别下降了74．1％、66．2％、45．2％和69．6％，果糖含量分别下降了72．0％、38．0％、68．3％和84．6％，葡萄糖含量分别下降了66．7％、62．5％、42．2％和65．2％，脯氨酸含量分别下降了83．0％、51．0％、43．3％和70．6％，可溶性蛋白质变化不大；蔗糖合成酶、蔗糖磷酸合成酶活性下降，蔗糖分解酶活性增加，蔗糖分解酶活性是蔗糖合成酶活性的22～35倍，是蔗糖磷酸合成酶活性的55～80倍。研究结果说明，春季牧草萌发时，根中已糖含量的下降是蔗糖分解酶活性增加的结果，根中脯氨酸作为氮的贮藏物质被用于根的呼吸和蛋白质合成。春季牧草根的抗寒能力随着根中低温保护物质的减少而下降，这也说明牧草的低温保护物质和牧草的抗寒性密切相关。

Abstract:Changes of antioxidant enzymes were investigated in two wheat (Triticum aestivum cv.) cultivars with different sensitivities to drought under water deficit and rewatering. LC-20 showed a higher relative water content than YJ-24 during the whole stress per

Abstract:The components of xanthophyll cycle in plant tissue are separated and determined by thin layer chromatography(TLC). The method that prepared violaxanthin in large quantity was established, and it has such advantages as short time, good separation efficife

Abstract:A experiment was conducted in Hexi corridor during 2001~2002 to study the effect of several cutting times on the development ability of root system in lucerne. The study showed that the cutting restrained the taproot growth toward depth but increased its

Abstract:以大豆(Glycine max Merr.)为实验材料，研究了CO2激光不同功率密度和不同时间处理对大豆种子发芽率、淀粉酶活性、可溶性蛋白质、可溶性糖含量和氨基酸含量的影响。结果表明：(1)16mw／mm^2、18mw／mm^2、20mw／mm^2CO2激光处理均能提高种子发芽率、淀粉酶活力、可溶性蛋白质、可溶性糖含量和游离氨基酸含量，其中18mw／mm^2CO2激光处理效果最好；(2)相同功率(18mw／mm^2)不同时间处理均能提高种子发芽率、淀粉酶活力、可溶性蛋白质和游离氨基酸含量，处理时间以75s效果最好。

Abstract:In loess hilly and gully region, the roots of Longwangmao almond-apricot horizontally distributes from 50 cm to 180 cm around the trunk and vertically distributes in subsoil from 30 cm to 80 cm principally. The roots have three growing peaks in a year and

Abstract:The effects on some physiological characters of seedling and germination of radish seeds after treated with heavy metal Hg~(2+)were studied. The results indicated that the germination capacity, and the germination index of seeds were decreased rapidly, as

Abstract:Agropyron elongatum is a near-related species of common wheat. SDS-PAGE indicated that the composition of glutenin subunits in Agropyron elongatum was much more abundant than that in common wheat. A novel high molecular weight glutenin subunit (HMW-GS) ge

Abstract:Carbohydrates, free amino acids, IAA, GA_3 and ABA contents in anthers of different stages of Dong A recessive genetic male sterile lines (Kang A_1, MA)were measured. Less starch accumulation and abnormal contents of 4 free amino acids were detected in st

Abstract:The paper probes the primary dynamic reason for the degeneration of vegetation and the forming of sandy soil, and its characteristic of varied time-space distribution taking the pasture in the alpine wetland at Maqu in Gannan as the research object. Based

Abstract:Quercus variabilis population dynamics model can illustrate the law of natural population dynamics and its regulate mechanism, it can post the inherent regulation and forecast the behaviors of population. Matrix model is a kind of "i" state distribution m

Abstract:This paper reviews the plant resources with antimicrobial activities in Xinjiang of China. Eighty-eight higher plant species belonging to forty-one families, including plant name, the part of each plant studied and the spectra of inhibitory activity, are

Abstract:子午岭林区计有种子植物94科361属689种。其中裸子植物3科8属10种1变种；被子植物91科353属678种。中国特有属8个，特有种271个，子午岭特有种1个。其种子植物区系的基本特征是：植物种类相对丰富；区系成分复杂，多种成分交汇；区系组成以华北成分为主体，以温带成分占优势；南北区系成分存在差异，垂直分布带谱不明显；在中国植物区系上隶属于泛北极植物区中国-日本森林植物亚区的华北地区黄土高原植物亚地区。

Abstract:The forest vegetation types of Ziwu Mountain include 11 Associations, e.g. Ass.Pinus tabulaeformis, Ass.Platycladus orientalis, Ass. Quercus liaotungensis, Ass.Populus davidiana, Ass.Betula platyphylla, Ass.Populus simonii, Ass. Pinus tabulaeformis-Quercu

Abstract:Based on the study of investigation, collection and identification of pleurocarpous mosses in Hebei Province, the bryoflora in this area are studied by utilizing statistic analysis of floristic spectrum (FSA) and principal components analysis (PCA). The r

Abstract:Cladistics is the current method to settle the relationship of phylogenesis. In this article, 16 operational maximum units (OTUS) of Heracleum L. from China were studied by means of cladistic analysis so as to understand the phylogenetic relationship of H

Abstract:A simple and accurate method for the determination of geatiopicroside and loganic acid in wild and cultivated Gentiana straminea herbs has been set up by high performance liquid chromatography.The qualities of wild and cultivated herbs as Tibet medicines

Abstract:The essential oil from Swertia chirayita was extracted by steam distillation. The chemical constituents were isolated, and were identified by capillary GC-MS method. 63 compounds from the oil were identified, and using known alkane standard. The relative

Abstract:The optimum condition of extracting the flavonoids in bee-pollen of Brassica campestris Qinghai was studied by the orthogonal experiment design. The content of flavonoids in bee-pollen was determined by HPLC and colorimetry. The optimum conditions were as

Abstract:以陆地棉“中棉所24”为材料进行了全固体体细胞培养，获得了愈伤组织和再生植株。愈伤组织诱导阶段采用0．01IAA 0．01KT 0．012，4-D的培养基效果好，继代时间多为30～50d；激素由高到低的继代可明显提高胚性愈伤分化率，IAA和KT含量均较低，IAA／KT比例为1：1～1：6，胚性愈伤最高分化率为50．22％。

Abstract:Seven kinds of herb flower (Senecio cruentus, Tagetes erecta,Petunia hybrida,Dianthus caryophyllus, Euphorbia pulcherrima,Cyclamen persium,Salvia splendens ) were treated with 1% solution of N. commune extracts under green-house conditions. As compared wi

Abstract:The leaf ontogeny of Sinofranchetia is described in the present paper. The leaf primordia are integrate at the stage of initiation. Two lateral leaflet primordia initiate from the each side of the leaf primordium later. The remained terminal part forms th

Abstract:The effect of K~+ / Na~+ on stomatal movement was observed. After epidermises of rich potassium plant's isolated leaves had been treated with different concentration of KCl,NaCl for 30 min under illumination condition. The results showed that Na~+ could a

Abstract:In this test, the stems with single bud of almond's rootstock "Hansen" were collected as explants that were studied on rapid propagation. The results showed that the best time to get the explants is in the end of March. The medium MS + 6-BA 1.0 mg/L +GA_3

Abstract:Ascorbate (ASC) is a major metabolite in higher plants and present in different cell compartments of cells. At a physiological level, ASC participates in a scavenging pathway of reactive oxygen species in the chloroplast known as the ascorbate-glutathione

Abstract:Modern biotechnologies are more and more applied in forestry research and practice, and will bring deep influence on the development of forestry. This article summarizes the biotechnologies currently used and being developed in forestry. It discussed the

Abstract:The growth of trees is closely relative to the environment and is influenced by the climatic changes. As an important parameter to show the climatic and environment changes, tree-ring width has been paid more attention and applied by lots of ecologists. I

Abstract:Sexual reproduction and asexual reproduction are the main reproductive mode of plant. Clonal reproduction is a kind of special reproduction. In narrow sense, it refers to vegetative propagation. In this paper, reproductive allocation and reproductive effo

Abstract:This paper summarizes the research progress of the factors involved in controlling the process of oak somatic embryogenesis,as well as the genetic variation and histology at present. Somatic embryos from mature explants have been obtained,but the frequenc