Abstract:In maize ( Zea mays L.) single cross breeding programs,identifying high yielding hybrids and inbred lines with superior performance is an important problem.The seventeen inbred lines were analyzed by random amplified polymorphic DNA (RAPDs),and the re

Abstract:Brasenia schreberi Gmel.is a kind of perennial plant.It is welcomed for its nutritious and medical values.But its seeds are usually in short supply.Researches have shown that its winter bud is a perfect organ for its vegetative reproduction.The winter b

Abstract:The tapetum specific promoter ( Osg 6B) from rice was sequenced artificially.The results indicated that the eight nucleotides in the cloned 1.73 kb Osg 6B was different from that the reported.They shared a 99.5% sequence homology.The cloned promoter

Abstract:对细胞质分别来源于提莫菲维（Ｔ．ｔｉｍｏｔｈｅｅｖｉｉ），粘果山羊草（Ａｅ．ｋｏｔｓｃｈｙｉ），偏凸山羊草（Ａｅ．ｖｅｎｙｒｉｃｏｓａ）的３种普通小麦的雄性不育系，相应保持系和恢复系及其上的ｍｔＤＮＡ用１２个线粒体基因探针进行了ＲＦＬＰ分析，结果为：⑴Ｔ、Ｋ、Ｖ型不育系的ｍｔＤＮＡ在组织结构上存在显著差异；⑵Ｔ、Ｋ、Ｖ不育系的ｍｔＤＮＡ与共同的保持系间显著不同，失测ｍｔＤＮＡ与小麦ｃｍｓ有关；⑶在

Abstract:Each of the nineteen improved lines of Huangzao 4 was crossed with Xihuang gai, which is one parent of single cross Xinong No.11,to produce the close relative crosses.These close relative crosses were crossed as female parent with WN 11 ,which is an

Abstract:The selection principle is selecting stand from fine seed source and from them selecting fine individuality.Methods for the selection of with sample plots and check trees were compared on the basis of 19 sample plots.Comparisons of 1~5 check trees with 32

Abstract:Field experiments were conducted over three consecutive years (1995~1998).In the same weather conditions,soil and cultivating,characteristics of flag leaf senescence and activated oxygen metabolism for cold type wheat (CTW) and warm type wheat (WTW) were

Abstract:Using two wheat cultivars with different grain weight as material,changes of iPA and ABA contents in flag leaf,root and grain of wheat after anthesis as well as their respective relations to photosynthetic rate of flag leaf,root vigor,and grain weight wer

Abstract:旗叶自然衰退过程中光合膜特性变化的结果表明，光合功能高值持续期类囊体膜电子传递活性均维持较高水平，多肽组分也维持相对稳定；进入光合功能的速降期后，活性呈快速下降趋势，类囊体膜小分子多肽等组分均出现不同降解。旗叶全展后叶绿体ＡＴＰ含量在高值持续期维持一定水平；进入速降期后，对应于光合膜电子传递活性及Ｐ／Ｏ值，叶绿体ＡＴＰ含量变化存在“滞后”的现象；强光逆境下，速降期类囊体电子传递活性受抑制程度比高值

Abstract:A salt tolerant wheat cultivar Dekang 961 was screened by determination of germination rate (Gr),germination index (Gi),vigor index (Vi) and yield product in saline soils.Effect of plastic film mulching on soil temperature,soil water content,soil salt c

Abstract:实验结果表明：烟划愈伤组织在生长和衰老期间，总呼吸速率（Ｖｔ）分别在１１ｄ和１９ｄ出现２次呼吸跃升；细胞色素途径的运行（ρ＇Ｖｃｙｔ）与Ｖｔ的变化几乎一致，表明细胞色素途径仍组织主要的电子传递途径；交替途径容量（Ｖａｌｔ）及其与Ｖｔ的比值（Ｖａｌｔ／Ｖｔ）：在１５ｄ前不断上升，而在１５－１９ｄ之间处于稳定水平后下降。交替途径运行（ρＶａｌｔ）及其对Ｖｔ的贡献（ρＶａｌｔ／Ｖｔ）却与Ｖａｌｔ变化趋势

Abstract:研究了上海地区的主要栽培品种之一“鲜丰”番茄下胚轴离体培养过程中的激素调控 ,结果表明 :“鲜丰”番茄下胚轴进行离体培养过程中 ,MS培养基上附加不同浓度的生长素( IAA)和细胞分裂素 ( BA) ,对愈伤组织的形成影响不大 ,但对不定芽的分化有较大的影响 ,得出最佳培养基为 MS+ BA1 .0～ 2 .0 mg· L- 1+ IAA0 .2 mg· L- 1。用不同浓度的 ZT、BA、KT进行单因子芽器官的诱导实验 ,发现 ZT的作用力强于 BA和 KT,KT最弱 ;用不同浓度NAA、IAA、IBA、2 ,4- D进行发根培养实验 ,发现番茄的内源生长素浓度较高 ,用外植体直接发根外加生长素有一定的作用 ,若用不定芽扦插发根 ,不附加生长素也极易发根 ,故番茄的生根培养基为 1 /2 MS或 MS附加 IAA 0 .0 5～ 0 .1 mg· L- 1。另外 ,对有关细胞启动、分裂、分化以及器官发生的组织学观察表明 :番茄离体培养中不定芽通常发生在愈伤组织的周边区 ,也可起源于维管组织结节周围的形成层状细胞。不定根则由茎中柱鞘处发生。

Abstract:以发根农杆菌Ａ４菌株介导，对宁夏枸杞叶片和茎切段的遗传转化进行了初步研究，建立了发状根体系，并优化了转化条件。乙酰丁香酮的添加、农杆菌液的浓度、共培养时间、外植体取材部位及时间，均可以影响发状根的诱导频率。采用添加１００μｍｏｌ／Ｌ的 乙酰丁香酮、振荡培养２４ｈ的Ａ４菌液感染３周龄的叶片切段，并共培养３ｄ，可以得到最佳的转化效果，发状根的诱导率为４８．９％。在同样的转化条件下，只有１３．６％的茎切

Abstract:This paper deals with studies on \%in vitro\% culture of bulbil of Dioscorea opposita ,including callus induction and differentiation,plantlet root development and transplantation.Results showed:(1) Calli were obtained from bulbil on media containing d

Abstract:In current paper,using the tender stem segment as the explants,the tube propagation of Humulus lupulus L.by minicutting type was studied.The optimal medium which could develop seedling directly was screened out,namely,MS+6 BA 0.01 mg/L +IAA 0.1 m

Abstract:The paper mainly studied the effect of Hg 2+ on external morphology,chlorophyll content,activity of peroxidase and nitrate reductase,soluble protein et al physiological index of Nymphaea tetragona Georgi.The conclusion was that:the injury on exte

Abstract:本研究用两种不同催花液对唐菖蒲切花进行了处理。结果表明催花液不但具有催花效应，而且具有保鲜效应；催花液Ｉ的效果优于催花液Ⅱ。结果还表明催花液能够提高唐菖蒲切花的开放率（第１５天比对照平均多３４．４８％），降低衰老率（第１５天比对照平均人低５６．８２％），明显地缓解切花水分胁迫，改善体内水分平衡，抑制和缓解干物质和蛋白质的降解。

Abstract:After soybean flowered,leaf photosynthetic rate (PN) and conductivity of stomatal (CS) was a parbola.They maximized on 21 day and 8 day after leaf show (ALS),respectively.Like PN and CS,catalase (CAT) activity,superoxide dismutase (SOD) activity,peroxidas

Abstract:通过对金冠、新红星、毛里斯３种苹果品种光合特性日变化，季节变化的研究，结果表明：金冠、新红星２种苹果树的光合速率（Ｐｎ）在日变化中出现相似的峰值，日变化呈单峰曲线，高峰值出现在一日中的９：００－１１：００。毛里斯苹果的光合速率（Ｐｎ）日变化呈双峰曲线，高峰值出现在一天之中的９：００－１１：００，３种苹果光合速率（Ｐｎ）在季节变化曲线中高峰值期为６月份。并得出各种苹果的光合速率（Ｐｎ）与其蒸腾强度Ｉ

Abstract:利用大型防雨设施池栽，严格调控水量，研究夏玉米全程及阶段性土壤水分胁迫对植株性状整齐度的影响。结果表明，夏玉米生育全程水分胁迫，植株性状整齐度全面劣化，产量极低；苗期阶段水分胁迫导致大、小苗，壮、弱苗两极分化明显，株高整齐度显著下降，其负效应持续至生育后期，生育进程推迟，千粒重显著降低，对产量造成一定影响；穗期阶段水分胁迫对穗长、穗料数整齐度影响明显，产量降幅度较大；花粒期阶段水平胁迫对千粒重及穗

Abstract:In this essay,the author determined some physiological indexes of salinity tolerance of some halophytes.The results of determined the physiological indexes of salinity tolerance were shown:the average value (AV) of MDA content of functional leaves of halo

Abstract:通过田间试验，研究了不同施肥水平条件下冬小麦吸收氮、磷的营养特征。结果表明，不同施肥水平冬小麦返青前吸收氮、磷均很少，返青后迅速增多，至孕穗一灌浆初期达全生育期吸收的高峰（Ｎ０Ｐ０吸氮在拔节一孕穗阶段达高峰），且峰值随施肥水平提高而增大。灌浆以后，氮磷营养不同，氮素积累减少２８．２７％－３１．１９％，减少绝对量随前期吸氮增大而增加。相对量则是施肥低于对照；而磷素于灌浆中期一成熟阶段还有１吸收高峰（

Abstract:N and K concentrations and N and K balance in tobacco middle leaves were investigated in the center of Yunnan province at the vigorous growing stage.Results showed that:(1) Generally,ranges of N and K concentrations in tobacco leaves were \{2.5%\}~4% and

Abstract:Study on the distribution and form of vegetative storage proteins (VSPs) in temperate hardwoods of 29 species and 2 varieties of 15 families was made by using light microscopy and the method of histochemical staining which is specific to protein.Results s

Abstract:The mesophyll cells and stomata of six spring wheat species under water stress were studied.The difference is not evident to the percent of the mesophyll cells with different rings during the different water stress and during different species.With the in

Abstract:Some axillary buds of \%Gossypium hirsutum\% developed into vegetative shoots and some developed into reproductive shoots.There are different in the two kinds of axillary buds.The apical meristems of the vegetative shoot apexes were like half balls or ta

Abstract:We made observations on the anatomy of primary structure of young stems of 5 species in Pinaceae.Those species,ie., Picea asperata,Keteleeria fortunei,Cedrus deodara,Pinus fenzeliana and P.taiwanensis Hayata var. damingshanensis ,are included in

Abstract:Study on the spatial changes of Average Annual Rainfall (AAR) is not only a basis of the engineering planning for rain harvesting agriculture,but also an important index for the reasonable utilization of limited rainfall water resources.Using ARC/INFO GI

Abstract:通过对２０多年来ＥＮＳＯ事件的发生与杉木人工林胸径生长关系的研究，探讨全球气候异常对林生长动态的影响。结果表明：厄尔尼诺及南方涛动杉木人工林胸径生长存在显著影响（α＝０．１０）。以南方涛动为自变量，建立杉木人工林胸径生长模型，模拟精度达９３．６１％，为林木生长预测提供了新途径。

Abstract:头发七经有机溶媒脱色、热水提取、乙醇沉淀及进一步精制得头发七多糖（ＡＬＪ）。该多糖经Ｓｅｐｈａｄｅｘ Ｇ－７５柱层析证明为均一多糖，气相色谱测得头发七多糖是由鼠李糖（Ｒｈａ）、阿拉伯糖（Ａｒａ）、木糖（Ｘｙｌ）、甘露糖（Ｍａｎ）、葡萄糖（Ｇａｌ）聚合而成的杂多糖，其摩尔比为３．４３：２．８６：１．００：８．５７：８５．７１：５．７１。经Ｓｅｐｈａｄｘ Ｇ－２００凝胶过滤法测得其平均分子量为１．８５

Abstract:The auther think Tugarinovia ovtifolia (Ling et Ma) Y.Z.Zhao should be an independent species.Therefore,there are two species in Tugarinovia genus. Tugarinovia mongolica is a distributional species of north Alasan East Gobi.and T.ovatifolia

Abstract:The karyotypes of 5 species of Leymus Hochst.are reported in this paper.The karyotype formulae are as follows: L.racemosus (Lam.) Tzvel.,2n=4x=28=24m(2SAT)+4sm(2SAT); L.crassiusculus L.B.Cai,2n=4x=28=22m(2SAT)+4sm+2st(2SAT); L.ruoqiangensis S

Abstract:The chromosomes number and karyotype of 3 genera 4 species of Liliaceae in Ziwu mountain of Gansu province were reported in this paper.Those are as follows: P.megaphyllum 2n(2x)=22=4m+12sm+12st+6st,karyotype is 3B; P.odoratum 2n(2x)=20=12m(2SAT)+8sm

Abstract:The biological property and ecological habit of \%Hippophae\% was one of the focus for numerous studies,and a consistent opinion was achieved in the traits of epidermal hair,root anatomical structure and biological nitrogen fixation.Some differences,howev