Abstract:With a newly developed rhizobox system,studies on changes of pH and available phosphorus (P) in the rhizophere of P efficient wheat genotype were carried out.The results indicated that pH value and available P in the rhizosphere were much lower than that

Abstract:对４℃和１１℃两种低温胁迫过程中水稻类囊体膜色素与蛋白组成的变化进行了比较研究。结果表明：４℃低温不仅使类囊体膜中的光合色素（叶绿素、类胡萝卜素）含量降低，而且还引起膜蛋白组成的深刻变化，表现在大部分原有膜蛋白组分的含量在低温下明显降低，同时在低温处理的第３天诱导出一条３２．５ＫＤ的新蛋白带。与４℃处理相比，１１℃低温处理只引起了光合色素含量的降低，而对类囊体膜蛋白组成的影响不大，另外发现，两种低

Abstract:将红豆草种子在含１．２％ＮａＣｌ的ＭＳ培养基上萌发以消除盐敏感的幼苗，把存活的幼苗下胚轴切段在含１ｍｇ／Ｌ２，４－Ｄ、０．５ｍｇ／Ｌ６－ＢＡ及１．２％ＮａＣｌ的ＭＳ培养基上诱导愈伤组织，通过连续筛选得到可耐受１．８％ＮａＣｌ的愈伤组织，在有０．２ｍｇ／Ｌ ＮＡＡ和１ｍｇ／Ｌ ＩＡＡ存在下该愈伤组织分化出芽，待幼，待幼苗长至３ｃｍ左右时转至含２ｍｇ／ＬＮＡＡ和或ＩＢＡ的１／２ＭＳ培养基上生根。对对照

Abstract:The net photosynthetic rate,stomatal resistance,concentration of CO 2 in diachyma cell,transpiration rate,absorption rates of light by leaf,and chlorophyll contents were determined to study the physiological compensation effects of nitrogen fertilizer on

Abstract:The solution culture experiment was conducted in order to investigate the relatively uptake capacity of lettuce,rape,soybean and wheat to nitrate and ammonium,as well as the influence of 3 different nitrogen sources on growth and development of these four

Abstract:Soil water deficit resulted in the content of nitrogen,phosphorus,and iPAs declined while of ABA improves,and had effects on floret differentiation and development.As a result,the fructiferous grains decreased.Under adequate water condition,there was no r

Abstract:Embryogenic callus of Picea meyeri Rehd.et Wils.cultured on MS+2,4 D 1 mg/L+KT 1 mg/L remained high growth rate and differential ability through 3 year subcultures.There were variations in number of chromosomes in embryogenic callus cells.But the nu

Abstract:实验通过对６个人工合成小麦品系和对照品种“中国春”种子根愈伤组织分化形成再生植株的过程进行形态和组织切片观察，发现分化初期有２种途径，一种是从愈伤组织先形成不定胚，然后再发育成不定芽和不定根，另一种途径是直接从愈伤组织中分化发育成不定根和不定芽；分化后期不定芽和不定根生长发育有３种类型：一种是不定芽发育先于不定根，一种是不定芽与不定期不定芽和不定根生长发育有种类型：一种是不一定芽发育先于不定根，一

Abstract:The segment of hypocotyl from two species of \%Cucurbita\% were grafted under sterile culture.The vascular development in the graft union from heterograft of \%C.pepo/C.moschata\% and autograft of \%C.moschata\% was examined by using light microscopy.The

Abstract:Induction of embryoid from unpollinate ovaries of Nicotiana tabacum L.was investigated in this thesis.The results obtained were summarized as follows.Embryoid was originated from single cell,either megaspore or egg cell.Ovary inoculated at early stage

Abstract:利用细胞学和ＲＡＰＤ技术，对从小麦与中间偃麦草杂种后代中选育的抗白粉病异附加系ＤＡＬ６６进行了鉴定。结果证明ＤＡＬ６６根尖细胞染色体数为４４，花粉母细胞减数第一分裂中期（ＰＭＣ ＭＩ）杂色体模型为２ｎ＝２２Ⅱ。对ＤＡＬ６６及其双亲进行ＲＡＰＤ分析，从４０个随机引物中筛选出１个特异引物（ＯＰＥ－０２）能够稳定地扩增出特异带型。

Abstract:根据群体遗传结构模式，将毛泡桐＊白花泡桐和毛泡桐＊兰泡桐Ｆ１无性系的年生长进程划分为早中后期。通过用Ｌｏｇｉｓｔｉｃ曲线对各无性系的年生长的模拟，估测了各无性系生长速率的最大点和速生期天数。根据速生期对早中后３个时期的覆程度，对不同无性系的生长形式作了分析。以正交多项式模拟生长曲线，检验了苗高，地径增长曲线的差异显著性，结果显示，无性系间苗高，地径生长曲线在阶段上存在显著差异。

Abstract:wheat materials were identified for lodging resistance and 9 genotypes of special resistance type were screened,in which there were 4 materials having high yielding characteristic.Relation analysis results indicated that both plant height and height of gr

Abstract:对６个不同生态类型小麦品种及其完全双列杂交Ｆ１的穗分化特点及抗寒性进行比较研究，结果表明，杂种在穗分化进程上存在明显“倾早现象”：但杂种的抗寒性强弱由其抗寒性强的亲本起主导作用，不同生态类型品种间杂交，有可能选育出幼穗分化早，越冬性好的强优势组织。

Abstract:A comparison is conducted between the trace pollens and normal pollens in the same and different pistils.The results show that the trace pollens in CMS can pollinate and get pods,but they have low vigor,slow germination,short duration,low pollination and

Abstract:The altifrigetic subnival vegetation and eco environmental conditions at the source area of Urmuqi river were investigated,the adaptive properties and ecological countermeasures of subnival plants in morphology and structure and reproductive ways were an

Abstract:The paper sorted out 53 species,7 subspecies,6 varieties and 1 form of Pedicularis L.from Gansu province.Their habits and distribution were reported.Among them,4 species and 2 subspecies were first recorded in this province.

Abstract:Shiwandashan pteridophyte flora which locates at south of the Tropic of Cancer is very rich in families,genera and species,in which there are 264 species represented 113 genera and 52 families.The types of area pattern are of diversity.The genera and spec

Abstract:Potaninia mongolica\% is the endemic single species genus plant in Mongolia plateau and has been classified as second degree national priority protective plant.In this paper,we have systematically described the eco biological characters of the \%P.mongol

Abstract:Anther development and microsporogenesis of Paeonia rockii CVS were originated from the primordium of stamen in the third year cycle of flower bud.Anther wall was formed in a special method due to the homology of tapetum cell and secondary sporogenous

Abstract:The tapetum of Dolichos lablab L.at several different developing stages was studied by transmission electron microscopy,and the main results are as follows:1.It was the first time to be found that during the tapetal development in Dolichos lablab

Abstract:Cucumber ( Cucumis satiuvs L.) seedlings of two lines with different resistance to high temperature were planted in this experiment.The line of Q10 was sensitive to the stress,and the line of T97 was resistance to the stress.The MDA contents increased

Abstract:The chemical composition of the volatile oil from Paederia scandens was analysed by gas chromatography mass spectrometer (GC/MS) technique.31 components,which constitute 77.16% the volatile oil,were identified and quantitatively determined.The conten

Abstract:Fruit ripening is a complicated developmental process which can be regulated.Series of physical and biochemical changes have taken place during this process.Recently,the studies on related genes such as polygalacturonase gene,ACC synthetase gene,ACC oxida