Abstract:本文用中麻黄无菌苗为外植体，其切段培养在附加２ｍｇ／Ｌ２，４－Ｄ和０．５ｍｇ／Ｌ　６　ＢＡ的ＭＳ培养基上，全部脱分化形成白色疏松愈伤组织。愈伤组织继代培养于ＭＳ＋０．５ｍｇ／Ｌ２，４－Ｄ＋０．２ｍｇ／Ｌ６ＢＡ＋０．２ｍｇ／Ｌ　ＮＡＡ＋４％蔗糖的培养某上。以继代培养愈伤组织为材料进行悬浮培养，培养基为附加０．２ｍｇ／Ｌ２，４－Ｄ＋０．１ｍｇ／Ｌ６ＢＡ＋０．１ｍｇ／ＬＮＡＡ＋２％蔗糖的ＭＳ液体培养基，得到分散性好，细胞形状接近圆形，细胞大小均一，细胞团多由２－３０个细胞组成的悬浮培养体系。第三代悬浮培养细胞增长率为０．３５ｇ·ｆｗ／２０ｍｌ·ｄ，细胞有丝分裂指数为１１．２％。条件培养和高密度接种可缩短延迟期，条件培养不能提高分裂指数，１ｇ／１０ｍｌ接种密度可使分裂指数提高至２１．２％。

Abstract:The ultrastructural studies changes of somatic embryogenesis in Asparagus officinalis were studied.There was central vacuole in unembryogenic cells.Alot of autophagic vacuoles were ob- served.In the embryogenic cells some small vacuoles,a large nucleus

Abstract:The DNA of Agropyron elongatum which is resistant to rust was introduced into commonwheat Ganmai 8 by the technique of anther tube passage,a great range of variations took place inthe progenies of the acceptor and two new lines with high yield,high tiller

Abstract:Bystudy on the effect of plant hormone,the changes of soluble proteins and the frequencyof somatic embryogenesis from Lycium barbarum,it was found that there may be certain relation-ship between them,The result showed that the frequency of somatic embryog

Abstract:Ｎｄ￣（３＋）对植物叶绿体类囊体蛋白复合物的影响，不仅表现在对叶绿体类囊体膜溶液的吸收光谱改变上，而且也表现在对色素蛋白复合物ＳＤＳ－ＰＡＧＡ电泳带扫描图谱吸收峰面积变化上；同时也对ＤＣＩＰ光还原活力表现出抑制作用，对Ｃａ￣（２＋）－ＡＴＰａｓｅ的活力表现出低浓度激活，高浓度抑制的作用。

Abstract:ＲｕＢｐ羧化酶作用后反应体系中能为加入的ＨＣｌ释放出的剩余，作为ＲｕＢｐ羧化酶活性指示。所释放的ＣＯ＿２以气相色谱法检测，用黄瓜叶片中ＲｕＢｐ羧化酶的反应时间曲线和酶量曲线验征，并与现行的分光光度，￣（１４）Ｃ标记测试方法比较分析，认为本方法具有应用简便、快速、准确、重复性好等优点。所以，可被认为是一种有效的测定ＲｕＢｐ羧化酶活性的方法。

Abstract:本文研究了浓度为０．０４１ｍｇ／ｍ￣３，０．０８３ｍｇ／ｍ￣３和０．１６６ｍｇ／ｍ￣３的ＨＦ气体分别对小麦、玉米和蚕豆三种植物熏气后，植物叶片中ＳＯＤ酶活力的变化及膜脂过氧化产物ＭＤＡ含量的变化，实验结果表明高深度ＨＦ（０．１６６ｍｇ／ｍ￣３）对ＳＯＤ有抵制作用，较低浓度（０．０８３ｍｇ／ｍ￣３，０．０４１ｍｇ／ｍ￣３）下是先升后抑。在三种浓度下，叶片中ＭＤＡ含量均随熏气时间的延长而增加。三种植物对氟化氢的敏感性不同，由大到小依次为蚕豆、小麦、玉米。

Abstract:Embryogenic calli and the somatic embryos at different stages were obtained when segmentsof young leaves and stems of Gentiana crassicaulis Duthie ex Burkill were cultured on MS medi-um.The activities and isozymic patterns of several isozymes from embryog

Abstract:The effect of crude oil pollution of soil on the germination,growth and yield of spring wheat(Triticum aestivum L.)and buckwheat(Fagopyrum esculentum Moench,)was investigated.TheIevels of the crude oil application varied from 0 to 30%by weight of the so

Abstract:The contents of macroelement(K,Ca,Mg,Na)and microelement(Fe,Mn,Cu,Zn)of leaveand seeds in Peganum in China northwest were determined by spectrophotometric method.Theresults showed that:Content change of K,Na,Ca,Mg was larger in different species of same

Abstract:A study of the differences in morphologiy,anatomy and physiology of stomatal complex of Anaphalis fiavescens in Manhanshan Mt.is provided.With the ocvation increasing,the stomataldensity on adaxial and abaxial surface of the leayes,the protruding degree o

Abstract:本文根据沙坡头水分观测站多年的土壤水分观测记录，建立了植物种生态位适宜度的数学模型，对各种固沙植物不同密度下的生态位适宜度，以及适宜度的时空变化进行了定量分析。结果表明合理的营林密度为２５００株每公顷，这时植物种的生态位适宜度最大。

Abstract:植物群落中物种多样性的维持是当代生态学领域中的一个核心问题。根据高斯竞争排除法则，占有相同生态位的物种不能共存。然而植物群落中共存种的数目经常可达数十个以上，难于用以竞争排除法则为基础的竞争共存理论加以解释。本文根据性别分配理论提出了一个新的植物种竞争共存机制；它可以允许占有相同生态位的物种共存。

Abstract:Drought is a common factor that threatens agricultural prduction,With limited water sup-ply,plants tend to produce an extensive rcot system,This is a necessary result of natural selec-tion,which is an evolutionarily stable growth strategy(ESS).But an ESS

Abstract:本文对甘肃省马衔山地区植被类型、空间分布及植被建群种、优势种和特征种的区系特征进行了分析。表明：１．该地区植被具有明显的温带性质及植被类型具有丰富性和过渡性的特点；２．该地区植被是共同起源于第三纪亚热带、亚高山植物区系的云冷杉林系列在黄土高原孤岛状石质山地的代表；３．由于长期特殊的自然地理条件和复杂的生态环境的影响，该地区植被中许多物种正处于分化过程中。

Abstract:A field experiment was conducted in 1993-1994 on drought plain tableland of Tangijapu,Dinxi County,Gansu Province,Various treatments were used which are partial removal of leavesand florets and thinning of adjacent plants and so on;The numbers of florets

Abstract:In this paper,the differential Characteristics of the plant communities under grazing experi-ment in sandy meadow rangeland are analysed by the use of TWINSPAN classification,PCA andDCAORDINATION TECHNIQUES.The resu lts sbow that grazing intensity is the