Abstract:Ecological Reconstruction of the Loess Plateau and Research of Soil Erosion and Dryland Agriculture

Abstract:The Sanjiaocheng section,located at the end of Shiyang River (closed basin) in arid land,Northwest China,well suited for reconstruction of paleao climate and paleao environment.This study focuses on the lower portion (460-292 cm) of the Sanjiaocheng sec

Abstract:The temporal and spatial dynamics of arbuscular mycorrhizal (AM) fungi were investigated in a field study at the Avdat Research Farm,Israel.Soil samples from the 0~10 cm and 10~20 cm depths were collected monthly between November 1999 and October 2000,und

Abstract:依据 1 998年在半干旱黄土丘陵区安塞的观测资料 ,对沙棘适应该地区生境的气孔运动进行了分析研究。结果表明 :(1 )沙棘气孔导度日均值为 2 1 4.47mmol· m- 2 · s- 1,日变化曲线呈双峰型。 (2 )沙棘气孔导度与 CO2 浓度间有十分显著的相关关系 ,复相关系数为0 .96 3 5 ;与光合有效辐射、气温、叶水势间有显著的相关关系 ,复相关系数为 0 .70 3 3～0 .8971 ;但与相对湿度间相关性不显著。 (3 )沙棘适应半干旱黄土丘陵区生境的气孔调节机制为反馈式反应 ,即由于叶水势降低导致气孔导度减小 ,从而减少蒸腾耗水 ,达到节约用水 ,适应干旱的目的 ;(4)沙棘的水分利用效率随气孔限制值的增大而减小 ,二者间呈显著的负相关。这为了解沙棘的抗旱机理 ,选育节水抗旱品种 ,提高水分利用效率提供了科学依据

Abstract:通过采用 2× 2列联表的 Fisher精确检验、Pearson相关分析和 Sperman秩相关分析等方法对芦芽山植物群落的种间关系进行了分析。结果表明 ,研究物种关联程度大小时 ,Sperman检验的灵敏性要高于 Pearson相关 ,使用 Sperman秩相关分析得出的结果较好 ,分层对种间关联性进行的研究发现 ,极显著相关和显著相关种对多发生于各层的优势种及次优势种间 ,并依层次不同而不同 ,其中草本层极显著相关种对最多 ,灌木层次之 ,乔木层最少

Abstract:利用Ven、K型小麦雄性不育系与北方春性普通小麦杂交,研究了Ven、K型春性F1杂种的优势表现及其与叶绿素含量、同工酶谱的关系.结果表明Ven型和K型杂种F1存在显著的个体杂种优势,在主要农艺性状中尤其以单株穗数、千粒重、单株生产力的杂种优势明显,其中单株穗数对单株生产力的贡献最大;相关分析表明单株生产力与单株穗数呈正相关,相关系数为0.7122;与每穗粒数和千粒重的相关系数分别为-0.1183和0.4941.灌浆期旗叶、倒二叶叶绿素含量与千粒重的相关性最大,呈正相关.杂种F1优势强的组合其种子和苗期的过氧化物同工酶和酯酶的酶谱一般呈双亲互补型或“杂种型”酶带,该特征可作为杂种优势预测的指标.

Abstract:Heterosis of vernal hybrid F 1 of Ven & K Type and their relation ship with chlorophyll content and zymogram of isoenzyme were studied by intercrossing male sterile lines of Ven & K typal wheat with North common spring wheat.The results showed that hybr

Abstract:对不同小麦（Triticum aestivum 2n=42 AABBDD）背景的4个小簇麦双二倍体进行了分子细胞遗传学分析。结果表明，经过自交7代选育，小簇麦双二倍体的遗传逐渐趋于稳定。其中V852cd和V853cd的遗传稳定性相对较好，RTC M，2m=56的植株分别占100％和83.33%，PMC MI，2n=28Ⅱ的频率分别为73.34%和70.72%，相对紊乱系数分别为0.021和0.022；用簇毛麦（Haynaldia villosa 2n=14 VV)DNA作探针进行原位杂交时，V851cd、V852cd和V853cd的体细胞中都有14条簇毛麦染色体，其染色体组成为2n=56=42W 14V,V854cd中有12条簇毛麦染色体，其染色体组成为2n=56=42W 12V 2T(W/V)。4个双二倍体籽粒蛋白质含量为19.28％－20.52%；V851cd,V852cd和V853cd对条锈病免疫或近免疫，高抗白娄病和叶锈病，中抗雪霉病和赤霉病。

Abstract:BT and WA type rice cytoplasmic male sterility (cms) lines were compared with their maintainer,restorer and F 1 hybrid by using RFLP analysis.The results showed:(1) polymorphism were found between BT and WA type cms lines;(2) difference could be

Abstract:Specific primers,synthesized according to conservative regions of apple,pear and apricot PGIP gene,were used to acquire PGIP cDNA by reverse transcription polymerase chain reaction.A fragment of 1 045 bp was obtained and cloned into pUCm T vector.Sequenc

Abstract:The plasmid pCAMBIA hBMP 3m was introduced directly to the Agrobacterium tumefaciens strain LBA4404 by freeze thaw method.The explant of leaf disc from tobacco sterile plants were transformed by LBA4404,plants were regenerated in selection medium c

Abstract:低浓度 L a3 +叶喷小麦整株幼苗后 ,随着干旱处理时间的延长 ,除对叶片相对含水量没有影响外 ,却对叶细胞膜相对透性、丙二醛产生量、O- ·2 和 H2 O2 的产生速率均有影响 ,其变化趋势与不加 La3 + 叶喷的正常和干旱处理的小麦整株叶片相比较 ,变化曲线上升部分却下降 ,下降部分却略有升高。表明 L a3 +可抑制干旱胁迫后引起的小麦幼苗叶片细胞膜相对透性增加 ,降低干旱胁迫引起的膜脂过氧化产物 MDA含量 ,抑制 O- ·2 产生速率 ,减少叶片中 H2 O2积累 ,阻止 Fe2 + 的继续生成 ,限制了由 Fe2 + 催化的 Haber- Weiss和 Fenton反应中底物 O- ·2 和生成· OH的生成速率 ,使小麦叶片中· OH产生量相对减少 ,降低了叶细胞膜脂过氧化水平 ,减轻膜伤害 ,起到了保护、防止膜免受干旱胁迫引起的伤害

Abstract:低浓度La3+叶喷小麦整株幼苗后,随着干旱处理时间的延长,除对叶片相对含水量没有影响外,却对叶细胞膜相对透性、丙二醛产生量、O-·2和H2O2的产生速率均有影响,其变化趋势与不加La3+叶喷的正常和干旱处理的小麦整株叶片相比较,变化曲线上升部分却下降,下降部分却略有升高.表明La3+可抑制干旱胁迫后引起的小麦幼苗叶片细胞膜相对透性增加,降低干旱胁迫引起的膜脂过氧化产物MDA含量,抑制O-·2产生速率,减少叶片中H2O2积累,阻止Fe2+的继续生成,限制了由Fe2+催化的Haber-Weiss和Fenton反应中底物O-·2和生成·OH的生成速率,使小麦叶片中·OH产生量相对减少,降低了叶细胞膜脂过氧化水平,减轻膜伤害,起到了保护、防止膜免受干旱胁迫引起的伤害.

Abstract:实验中发现，在培养基中加入适量PEG可以显著提高杜仲胚乳愈伤分化频率。PEG这种促进分化的效果既与PEG的分子量和所用的浓度有关，也与培养基中无机离子的强度和蔗糖浓度有关。效果最佳的培养基配方是：在激素组成为BA（2.0-2.75mg/L）＋NAA0.15mg/L）的基本培养基（MS无机盐＋B5有机物＋3％蔗糖）中，添加浓度为4％－6％PEG 4000或4％－5％PEG6000。在这种培养基上杜仲胚乳愈伤组织的分化频率均超过50％，最高可达70％以上，而在同样的条件下不加PEG时分化频率不到10％。然而，经PEG处理分化出来的胚乳再生植株中，部分苗玻璃化现象严重。

Abstract:以CO2脱涩后的火柿为试材，研究了脱涩后火柿在5℃条件下贮藏过程中主要生理生化变化及35℃热处理对其软化生理的影响。结果表明，柿果可溶性单宁含量的继续下降是柿果软化的一个原因；乙烯在脱涩柿果的软化中起着主导作用，呼吸速率及PE、PG和纤维素酶活性的变化与乙烯存在着紧密的关系。35℃热处理抑制了脱涩火柿可溶性单宁含量的下降速率，使乙烯生成量降低和乙烯峰出现时间推迟，刺激了早期的呼吸速率，抑制了后期的呼吸速率，降低了PE、PG和纤维素酶的活性，从而达到了延缓脱涩柿果轮化的目的。

Abstract:Effect of polyamines on endogenous polyamine content and membrane lipid peroxidation of cut rose flowers ( Rosa hybrida Hort.cv.Bellamie) were investigated during vase holding period,endogenous put content of cut rose flowers increased a little within

Abstract:The density test in different variety maize was studied under 4 different environment.The results showed that population sink source increased with density increasing,but the two increasing rangs were different,population sink increased larger than that

Abstract:The process of peanut plant senescence was studied with two high yielding peanut cultivars (cv.Luhua11 and Fu8707),the main results were as follows.The senescence process of peanut plant may be described as three phases.The first phase began from first a

Abstract:The effects of Cd on Hydrocharis asiatica Miq and the function of Pi decreasing the stress of Cd were proved in this paper.The results showed that the growth and metabolism of Hydrocharis asiatica Miq were inhibited by Cd.The plant exhibited a dec

Abstract:在果树休眠期，通过主干注射果树营养液替代果园土壤施肥，对苹果外部形态、果实品质及其生理作用影响进行了研究。结果表明，萌芽期提前，花期早而且盛花期花朵开放整剂稳定；萌芽率、成花率、成枝率提高；果树根系鲜重和数量显著增加，其中20－40cm土层中增长最为显著；叶片的光合速率和叶绿素（a b）含量也大幅度上升；果实品质明显改善，产量增加。从总体看，果树营养注射液有广阔的发展前景和推广价值。

Abstract:A new liquid culture using filter papers with motionless for corn root apical were established in this paper.The suitable culture medium included 1/4 enormous elements of MS,1/2 trace elements of MS and IBA 0.1~0.3 mg/L,and the roots should be grown under

Abstract:以不同浓度 B9溶液喷施香椿苗木 2～ 3次 ,2 5 0 0 mg· L- 1B9作用最显著 ,可使植株低矮粗壮 ,顶梢下第一复叶变长 ,增加叶片叶绿素含量 ,提高光合速率和比叶重。处理后的落叶苗木移入日光温室中 ,可明显减少休眠芽萌发所需的有效积温 ,从而利于提早上市。 B9处理后单株新芽数量、产量及芽内所含可溶性糖和粗蛋白含量增加

Abstract:以不同浓度B9溶液喷施香椿苗木2～3次,2500mg*L-1B9作用最显著,可使植株低矮粗壮,顶梢下第一复叶变长,增加叶片叶绿素含量,提高光合速率和比叶重.处理后的落叶苗木移入日光温室中,可明显减少休眠芽萌发所需的有效积温,从而利于提早上市.B9处理后单株新芽数量、产量及芽内所含可溶性糖和粗蛋白含量增加.

Abstract:细叶韭的花用乙醇浸提后制成膏，用乙醚萃取，蒸发除去大部分乙醚，残留物通过气相色谱－质谱仪分析，鉴定了46种化合物，占峰面积的83 .30%，其中含硫化合物4种；烃基芳香化合物11种，醛、酮类5种，长链烷烃6种，烯烃2种，醇、酚类10种，酯类5种，有机酸3种。细叶韭花叶的呈香物质主要为含硫化合物、醛、酮类、烃基芳香化合物、长链烯烃等，Vita-min E、β－，γ－生育酚、3β－羟基－5－烯－麦角甾烷、3β－羟基－5，16－二烯－妊酮是具有强生理活性物质。

Abstract:对从贯叶连翘中提取金丝桃素的工艺条件进行了优化研究 ,结果表明 ,金丝桃素提取较佳工艺为 :45℃的水浸泡 2 h后 ,加入 0 .5 % Na OH,用 75 %甲醇在 0 .0 5 Mpa下 78℃提取5次 ,每次 1 .5 h,溶媒量为 5倍 ,浓缩温度与干燥温度为 78℃

Abstract:Solutions of several metal salts were examined for their ability to stain polypeptides separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS PAGE).Protein patterns could be visualized less than 5 min after treatment of gels with cal

Abstract:In this paper,one method was reported of adsorbing and separating red pigment from Radish with X 5 resin.The result show:at pH 3.0~5.0,X 5 resin has more strong adsorption capacity,which adsorption capacity is the 82.6 mg/g resin,and the equilibrium tim

Abstract:以美国黄松成熟胚为外植体进行离体培养诱导不定芽。正交试验和统计分析结果表明基本培养基的种类对外植体不定芽的诱导起主要作用。在GD培养基上附加0.5mg/L的6－BA，外植体不定芽的诱导率达55％，平均增值率为6，最大增值率达10。NAA不利于外植体不定芽的诱导，培养基中加入适量的添生炭有利于不定芽的形成和生长。

Abstract:The plasmalemma permeability,MDA content and SOD activity of near isogenic lines wheat H8706 34,H8706 44,RH8706 48,RH8706 49 at salt stress(0.7% NaCl) were studied in this paper.The results showed that the SOD activity was high,the MDA content and t

Abstract:Based on the through investigation of Chinese date Zhongyang Muzao genetic resource in Jiaxian County,Shaanxi Province from 1994 to 1998,13 superior trees were selected by the methods of preliminary selection,secondary seletion and finalseclection.Statist

Abstract:This paper deals with the effect of Cd 2+ on the chlorophyll content,the activity of SOD,CAT,POD and ultrastructure in leaves of Hydrocharis dubia .The results showed that with increasing of the treatment concentration,the chlorophyll contnet,SOD,

Abstract:在陕西省淳化县对大扁杏、梅杏和山杏的抗旱性和雌蕊发育情况进行比较，发现在荒坡条件下大扁杏的叶绿素含量高于山杏和梅杏，山杏的抗旱性最强，大扁杏次之，梅杏最差。同时，3种杏雌蕊发育有明显的差异，大扁杏完全花的数量远大于梅杏和山杏，山杏雌蕊发育最差。

Abstract:以“四九菜心”为材料，用3mg/L的CPPU处理采后菜心，在常温（25℃）下贮存7d，通过测定其叶片叶绿素、可溶性蛋白质、丙二醛（MDA）的含量和SOD、POD酶活性等指标，结果显示经CPPU处理的菜心其叶绿素、可溶性蛋白质、MDA含量与对照菜心差异显著（P＜0.01），表明CPPU具有延缓采后菜心叶片衰老的作用。

Abstract:以北京8号桃作对照，对秦光油桃果实生长发育和落果进行了系统观察，结果表明秦光油桃果实生长曲线与桃一样，也可分为3个时期。不同的是秦光油桃硬核期果实仍继续生长，果实生长不呈典型的“双S”曲线。秦光油桃硬核期落果较重，这可能与其在硬核期继续生长有关。

Abstract:The effectiveness of different doses Fe EDDHA on correcting Qinmei kiwifruit leaf chlorosis was evaluated during two consecutive years following soil drench in calcareous soil in Qinmei kiwifruit orchards in Shaanxi Province.The results showed that the

Abstract:Alkaloid components were analysised in roots of four liquorice, Glycyrrhiza uralensis,G.glabra,G.inflata,G.pallidiflora .The result shows:the components of alkaloid were quinoline and in quinoline,total mean contents was about 0.29%.These study could pr

Abstract:The responses of plant stomata to air drought and soil drought,and the mechanism of hydraulic signal and chemical signal in regulating plant stomatal movement under drought condition were discussed briefly.Author pointed that the responses of plant stomat

Abstract:蛋白质丧失是叶片衰老的一个早期表现，降解的蛋白主要是可溶性蛋白中部分Ⅰ蛋白，随衰老加深，叶绿素含量、光合速率下降，保护酶活性降低。叶片这些衰老的表现是体内活性氧、自由基代谢失调累积的结果。

Abstract:The expansion mechanism,characteristics and effect factors of popcorn were summarized in this paper.The key problems of expansion popcorn was the high pression in the grain of corn.the compact structure of the peel and endosperm was the guarantee of formi

Abstract:The effects on Ca 2+ /CaM of ABA in transporting signals and the relationship of them were introduced in the article.

Abstract:介绍了胞间信号ABA在信号传递过程中对胞内钙信号的影响及其两者的关系.

Abstract:High resolution 2 D gel electrophoresis is mainly used to study the variation of protein synthesis in winter wheat seedling leaves under water stress and ABA treatment.Three different cultivers are used:NC4,NC37 and Fengkang13,NC4 and NC37 are homonucle

Abstract:The leaf anatomy and ultrastructure of Chenopodium glaucum ,a pioneer plant on the salinized wetland of Qinghai Lake,were studied and compared with those collected from the mid surrounding of Lanzhou University under LM and TEM.The thin leaf blades,ev

Abstract:The developmental process of microsporogenesis,the number of pollens in anther and the number of free pollens of the photoperiod sensitive male sterile Millet under long day cycles (LD,>15 h) and short day cycles (SD,=10 h) were investigated.Some special