Abstract:According to the amino acid conserved region of ACC synthase (1-aminocyclopropane-1-carboxylic acid synthase,ACS) from other plant,a group of degeneracy primers were designed in this paper.Three cDNA fragments about 1 kb were amplified and cloned into pGE

Abstract:Asymmetric hybridization was conducted between common wheat and maize which is a distantly related intergeneric plant(belonging to different tribe)of wheat and possesses some favorable traits.Irradiated by different doses of UV,the protoplasts of maize s

Abstract:The frequency of univalent,lagging chromosomes and micronuclei in tetrad in PMC of the 1B/1R and non-1B/1R CMS lines of wheat with Ae.kotschyi cytoplasm,and their maintainer and their hybrid F 2,were investigated.The results were as follows:(1) The affe

Abstract:BT type rice cytoplasmic male sterility line were compared with its maintainer,restorer and F 1 hybrid using mitochondrial DNA (mtDNA) RAPD analysis.The results showed that difference was between not only the cms line and its maintainer,but also cms lin

Abstract:The geographic variation of Fritillaria przewalskii Maxim.w as explored using multivariate techniques.Sixteen characters were measured in about 400 individual plants from 17 localities of F.przewalskii and its near relation F.unibracteata.The research rev

Abstract:The genomic DNA variations of type species of Elymus L.,R oegneria C.Koch and Hystrix Moench (Poaceae:Triticeae) were analyzed by using random amplified polymorphic DNA (RAPD).257 bands (88.62%) behave polymorphic in 290 RAPD bands amplified by 42 random

Abstract:Fourteen systems of seven Amaranthus L.species derived from Asian and Middle-South America were classified based on the RAPD data in this study.With eight effective primers selected from 80 ten-base random primers,103 DNA fragments were amplified,or aver

Abstract:独叶草 ( Kingdonia uniflora)是我国特有的稀有濒危植物 ,本研究应用方差 /均值比的 t检验、负二项参数、扩散型系数、丛生指标、Cassie指标、聚块性指标、Poisson分布和负二项分布的 χ2 拟合检验 ,对其种群的空间分布格局进行了研究。结果表明 :1独叶草种群总体呈聚集分布 ,t检验差异显著 ;k=1 .372 ;集群强度较高 ;Iδ=1 .730 >1 ;I=8.2 37,明显大于 0 ;CA=0 .72 9;m* /m=1 .72 9>1 ;离散分布拟合结果符合负二项分布模型。 2不同群落独叶草种群的聚集强度不同 ,牛皮桦 ( Betula utilis)群落的独叶草种群聚集强度最大 ,依次为箭竹( Sinarundinaria nitida)林、金背杜鹃 ( Rhododendron clementinae subsp.aureodorsale)灌丛、太白红杉 ( L arix chinensis)林、巴山冷杉 ( Abies fargesii)林。在此基础上 ,分析了格局形成的原因 ,提出了保护建议

Abstract:根据生态气候学方法推断出不同海拔高度气候指标，应用多元统计方法，对分布于秦岭太白山地区海拔3000－3400m的太白红杉（Larix chinensis)叶特征进行了生态解剖学研究，分析了影响其变化的主导生态因子。观察指标包括叶形态指标（叶片总厚度、每束叶中的叶数和叶长宽比）、叶解剖学特征（叶表皮角质膜厚度、上、下表皮厚度，近上、下表皮叶肉厚度，内皮层厚度，管胞直径，叶传输组织和维管束厚度及其与叶片总厚度之比）。结果表明：（1）水热综合因子是影响太白叶长宽比和叶表皮角质膜厚度的主导因子，随着水热综合因子的增大，叶长宽比呈增加趋势，而角质膜厚度则逐渐变薄。（2）年降水量是影响其它形态解剖学指标的主导因子，随着年降水量的增加，每束叶中的叶数、叶厚度、管胞直径、叶传输组织和维管束厚度、内皮层厚度、传输组织和维管束厚度及其与叶总厚度之比呈减少和变薄的趋势，而上、下表皮厚度则逐渐增加。（3）近上、下表皮叶肉厚度与环境因子无明显相关，可能属于比较保守的性状。

Abstract:Pollination experiment and pollen tube growth were studied in f our main almond cultivars in Kashi.The main results are as follow:The set percentage of "Yingzui" and "Shuangguo" were 19.74% and 4.29%,"Zhipi" and "Make" couldnt set follow self-pollination;

Abstract:Crop water use (sap flow) was measured with heat pulse techniqu e.Three apple orchards (M9,MM106 and Hashabi,rootstock is M9,MM106 and Hashabi,respectively) with different canopy structure were chosen for the study.The results showed that water use of the

Abstract:Two drought resistance and two drought sensitive genotypes whea t were used.A moderate and a severe water stress were exerted to wheat plants for a long-term.The osmotic adjustment and osmolytes were determined.The results showed that,The osmotic adjustme

Abstract:Under condition of field cultivation,winter wheat Yumai 49 were sprayed with GA 3?NBT?6-BA?TIBA?PP333 to study their effect on process of flag leaf senescence and yield constituents.It was found that each of them worked on the different physiological in

Abstract:The distribution of soil water content in the shrub sand land a nd bare sand soil was measured.The water content of both bare soil and shrub land increased as the depth of soil profile increased.The soil water content of shrub land was higher than that of

Abstract:The law of water requirement under population conditions in 5- year vineyard on sandy land was studied by soil water dynamics principle and water equilibrium method through observation space.For monitoring water dynamics and water potentials change,neutro

Abstract:The mathematical models of SOD or relative permeability of plas ma membrane (RPPM) on other physiology and biochemical procedures were established and analyzed with mathematics model and statistics.The results showed that:during aging of Chinese fir seed,

Abstract:恒山位于山西北部，有种子植物834种，隶属于342属、84科。种子植物属、种区系成分复杂，比较分析属、种的区系成分，得出恒山以温带成分占优势，在诸多温带成分中北温带分布型、旧世界分布型的属数和温带亚洲分布型、东亚分布型的种数占较高百分比。中国特有种的分布亚型以华北分布亚型种数最多，其次是西北－华北－东北分布亚型和西南－西北－华北分布亚型。

Abstract:Investigations have bee made in 10 stations of the rivers,lakes and marshes in the Heihe valley from May to August 1997,103 species of Phytomllankon were identified which inclde 16 species of Cyanophyta,2 species of Cryptophyta,3 species of Pyrrophytaand

Abstract:There are 128 families,605 genera and 1 231 species (infraspeci fic taxa were not inclued) of seed plants in Tianyuhe River-Valley in Qinling Mountains.The floristic analysis shows that 70.96% (386 genera) of total genera are temperate composition,21.13%

Abstract:Chinese Medicinal Herb Thymus mongolicus Ronn.was extracted by supercritical carbon dioxide and steam distillation.The extractions of SFE-CO 2 and SD parts analyzed by GC/MS respectively.Comparing different results of the two ways,we think that the meth

Abstract:应用放射性核素45Ca示踪方法,以烤烟品种"K326”为材料进行盆栽试验,研究在不同施钙水平下,烤烟对钙素营养的吸收分配规律.结果表明烟株在旺长期体内积存Ca量最高.烤烟吸收的Ca肥量随施Ca水平的提高或生育期的进程而增加,有显著的正相关性.烤烟吸收的钙肥在烟株的地上部分主要分配在叶中,其次是茎,花与侧芽较少.烟叶中吸收Ca肥量占地上部分的百分数随生育期进程下降,而烟茎的却增加.烟株地上部吸收的Ca肥量占施入量的百分数随施Ca水平的提高而减少,但随生育期进程而增加.

Abstract:A trial of calcium assimilation and distribution characteristic s in flue-cured tobacco plant was carried out with the aid of 45Ca tracer technique.The basin trial was done with tobacco "k326".Results obtained as following:The accumulation of 45Ca content

Abstract:lines and varieties of resistance to wheat sharp eyespot (Rhizoctonia cerealis) were identified in nature field,and some resistant germplasm were selected to identify accurately their resistance in artifical nursery.The results showed that 14 lines which

Abstract:Selected a strain of saccharomycete successfully,which can use sweet sorghum juice as fermentation substance to produce liquid bio-fuels from noninduce the strains by the minus chromosome method.The alcohol increase rate can be so high as 12.80% (v/v).

Abstract:将多次继代培养的无花果试管苗接种在含 Na Cl不同浓度的 MS培养基上 ,30 0mmol·L- 1Na Cl使试管苗致死。在 0～ 2 0 0 mmol· L- 1Na Cl的培养基上 ,试管苗生长显著受到抑制 ,叶片中 Na+含量增加 ,K+/Na+上升。同时 ,游离脯氨酸和可溶性糖含量也增加 ,可以认为 Na+累积是无花果试管苗盐适应的主要方面 ,脯氨酸和可溶性糖增加也起到了增强耐盐性的功能

Abstract:Treated with 0.1~0.2 mg/L MET in medium,regenerated tube plantl et of Humulus lupulus L.grew short and dumpy,number of each plantlet root increased,survival rate of transplant improved 13%.Treated with 0.5~2.0 mg/L MET,tube plantlets developed callus grea

Abstract:We have observed the pollen grains of submerged plant Vallisn eria longipedunculata first by electron microscope (SEM and TEM).The pollens possess very thin cell wall,and have not any aperture,but have 2~3 holes with the viscin threads.In the wall of the

Abstract:We have observed the pollen grains of submerged plant Vallisn eria longipedunculata first by electron microscope (SEM and TEM).The pollens possess very thin cell wall,and have not any aperture,but have 2~3 holes with the viscin threads.In the wall of the

Abstract:In the present paper,the chromosome numbers and karyotypes of Sphallerocarpus gracilis (Bess.) K-Pol.and Trifolium pratense L.are reported.The results of experiments are as follows:Sphallerocarpus gracilis K(2n)=2x=20=14m+4sm+2st(SAT),the karyotype asymm

Abstract:It is every close at range between the chloroplast and chondrio some on the chloroplast ultrastructure of Arenaria tapanchanensis and Chrysosplenium nudicaule.At the time,in the their chloroplast grana,there are remarkable expansion and stroma thylakoid e

Abstract:Non-mevalonate pathway of isoprenoids found recently is anothe r isoprenoid biosynthesis pathway.We summarized the advances in molecular biology of the new pathway.It was emphasized that the discovery of non-mevalonate pathway and the molecular clones of

Abstract:Abnormal embryoids and hyperhydric shoots,which have deformed morphological appearance and disordered phiysiological function,are two types of abnormal phenomenon occured frequently in plant tissue culture.Because they can not developinto normal plantlets

Abstract:Pollen morphology of 27 species and 4 genera of the Tamaricacea e from China was observed under light microscope and scanning electron microscope.The all pollen grains in Tamaricaceae are of 3-colpate type and no 3-colporate type was observed.The palynolo

Abstract:Investigated in this paper is the embryology of Ligularia prz ewalskii.The anther is tetraporangiate and its wall development conforms to the dicotyledonous type.The tapetum is similar to "The Cosmos bipinnatus" type.Cytokinesis is of the simultaneous typ

Abstract:The developmental and the anatomical structures of leaves of Aloe arborescens Mill.were examined with anatomical methods.The results showed that the leaf primordium is unsymmetrical during its early development stage.And the leaf primordium differentiate