Abstract:The ultratructure of the flag leaves and upper adventitious roots for six rice strains (cultivars) were studied by paraffin method.The results showed that the flag leaves and their cuticle of transgenic rice with BADH cDNA strains were thicker than those

Abstract:In Qinling Taibai Mountain,8 Larix chinensis forest-types were selected from 3 Larix chinensis forest-type groups and 20 stands were set up.180 plots in Larix chinensis population were investigated with the sampling method.The 8 Larix chinensis forest-typ

Abstract:Forests are an important vegetation type,and play a key role in global change and terrestrial (ecosystem) cycle.Forest net primary production (NPP) reflect the quantity that forest sequestration carbon and thus NPP is an important component of the carbon

Abstract:为了探明鸟类摄食中国沙棘果实后对中国沙棘种群扩散的作用，对①来自鸟粪肥的种子。②人工用酸和高温处理的种子和③作为对照的天然种子的萌发率和萌发速度进行比较，3种类型的种子均区分为具内果皮种子和不具内果皮种子两组。结果表明：酸性和高温环境对两种类型种子的萌发率影响不大，但中国沙棘果实的内果皮不仅使种子萌发推迟，而且还降低了种子的萌发率。灰喜鹊的消化作用虽然降低了中国沙棘种子的萌发率和萌发速度，但对中国沙棘种子的传播和种群的扩散仍有促进作用。

Abstract:In the experiment,some pollination ways were arranged adult Taxus chinensis var.mairei trees as follows:covering short branches with female flower buds isolating pollination using plastic bags before flowering,artificial pollination,wind pollination (cont

Abstract:The ecological conditions and living environmental characteristics of each kind of grasslands in the hilly and gully Loess area are studied,and the composition and the productivity change of grass varieties in the area are discussed in the paper.The pastu

Abstract:以盆栽萝卜为材料，研究了叶面喷布100～300mg／L ALA对萝卜植株生长、光合作用以及叶绿素荧光特性的影响。结果表明，ALA促进萝卜植株生长与其促进植株中下部叶片的光合作用有关。ALA处理提高了叶片光合表观量子效率，并降低了光补偿点。叶绿素荧光动力学资料显示，ALA处理不仅降低了叶绿素初始荧光Fv、稳态荧光Fs以及两者的差值ΔFu，还降低了暗适应以及光照下的最大荧光(Fm和Fm′)和可变荧光(Fv和Fv′)，但是不影响PSⅡ最大光化学效率(Fv／Fm)，对于中下部叶片PSⅡ实际光化学效率(φPSⅡ)还有明显的促进作用。ALA处理植株叶片光合非循环电子传递速率ETR显著提高，300mg／L ALA处理还降低了光合相对限制值L（PFD）。ALA具有促进叶绿素荧光光化学猝灭和非光化学猝灭的双重特性，其中，前者提高了叶片光化学速率，后者增加热耗散量以及提高热耗散速率。另外，本试验结果显示，ALA处理提高了植株基部叶片的叶绿素含量以及中下部叶片类萝卜素含量。以上参数变化说明ALA通过诱导光抑制保护机制来提高叶片光合效率。

Abstract:在位于中国北部半干旱区的多伦县选择 3种不同生活型的植物 ,每种生活型各选取 3种有代表性的植物 :3种落叶乔木白桦 Betula platyphylla 、山定子 Malus baccata 、山杏 Prunus armeniaca ,3种落叶灌木黄柳 Sal-ix flavida 、山刺玫 Rosa davurica 、羊柴 H edysarum laeve 和 3种多年生草本地榆 Sanguisorba officinalis 、菊叶委陵菜 Potentilla tanacetifolia 、叉分蓼 Polygonum divaricatum ,对它们的氮素回收特征进行了研究 .结果表明 :乔木、灌木及草本 3种不同生活型植物的氮素回收效率分别为 4 3.4 2 %、5 8.84 %、73.76 % ,氮素回收水平分别为 12 .4 m g· g- 1、10 .7mg· g- 1和 8.2 m g· g- 1 .两种深根系生活型植物 乔木、灌木 的枯叶具有较高的氮素浓度 即回收水平低 ,并且成熟绿叶与枯叶中的氮素浓度差异较小 即回收效率低 ,与之相比 ,浅根系的多年生草本植物的枯叶具有较低的氮素浓度 即回收水平高 ,并且成熟绿叶与枯叶中的氮素浓度差异较大 即回收效率高 .不同生活型植物氮素回收能力的差异说明了不同生活型植物对生境具有不同的氮素适应策略 ,另一方面 ,氮素回收效率和氮素回收水平可作为衡量植物氮素回收能力的两个重要参数 .

Abstract:An advanced determination of cell wall-localized PAO activities was suggested in this study.And the advanced determination of cell wall-localized PAO activities of cucumber roots under hypoxia stress was analyzed in terms of its sensitivity,its applicable

Abstract:利用大型活动式防雨旱棚 ,人工控制不同土壤含水量 ,全生育期系统研究了轻度及严重土壤干旱胁迫对夏玉米根系活力、叶片相对含水量、离体叶片保水力和根、叶质膜透性的影响 .结果表明 :土壤干旱胁迫下 ,玉米叶片相对含水量下降、离体叶片保水力降低 ;叶片及根系质膜透性上升 ,并且根的质膜透性比叶片上升快 ,根系活力下降 ;在干旱胁迫下 ,根系、叶片质膜透性与叶片相对含水量呈负相关 ,而根系、叶片质膜透性与离体叶片保水力呈显著正相关 ,根系膜透性与叶片膜透性也呈显著正相关 ,维持根系活力与保持较高的叶片含水量有密切关系 .另外 ,由于严重水分胁迫处理的上述特性和充分供水处理差异显著 ,而轻度胁迫和充分供水不显著 ,因此可以认为轻度水分胁迫 ,即土壤含水量为田间持水量的 6 0± 5 %为夏玉米正常生长发育的下限指标 ,可作为制定节水栽培措施的理论依据 .

Abstract:Growth,ionic content,activity of root plasma membrane H~+-ATPase,SOD activity and MDA content were determined in LM 15 (Triticum aestivum cv.Lumai 15) seedlings treated with Hoagland solution (control),150 mmol/L NaCl and 150 mmol/L NaCl+10 mmol/L trehalo

Abstract:Effects of enhanced UV-B radiation on the activities of SOD,POD,CAT and AP in Gentiana straminea Maxim.leaves,were studied.The results showed that in Gentiana straminea Maxim.leave the activities of superoxide dismutase (SOD) and peroxidase (POD) increase

Abstract:研究了不同剂量的紫外-B辐射与浓度倍增的CO2复合处理对大棚黄瓜(Cucumis sativus)生长发育过程中植株形态、叶绿素、可溶性蛋白质含量以及SOD、POD、CAT酶活性的影响。结果表明：作形态方面，UV-B辐射明显降低了植株的株高、叶柄长度、叶面积，而茎粗增加。复合处理B2C明显提高了黄瓜叶绿素的含量，整个处理对黄瓜蛋白质的含量没有大的影响；酶活性以B2C处理时，其SOD、POD、CAT酶活性最高。说明一定低剂量的UV-B与CO2相复合时，可以促进黄瓜的生长发育，其促进程度大于CO2单因子的效应。

Abstract:Elements both in dioscore plant and soil were analysed.The analysis showed that the content of each element was different between yam tuber and stem.Compared with the element contents in yam stem,Ni,Fe,P,and Al were much higher and Ca,Mg,Mn were much lowe

Abstract:The study of photosynthetic and physiological characteristics of the populations of two types of silage maize was conducted and the results were as follows:of silage maize,the leaf area and leaf area coefficient were bigger.While the leaf area increased q

Abstract:The inhibition of root growth and DNA damage resulting from by different concentration of Cr~(6+) were investigated at two growth stages of wheat (Triticum aestivum cv.Xiaoyan No.22) seedlings.The results were as follows:(1) Roots length,roots number,fres

Abstract:Protoplasts were isolated from sterile hypocotyls of Chinese cabbage Hetouzao A,Hetou zao B,Qingmaye C,Qingmaye D,Shite No.1,Shite No.2,Yuqing,Yunnong No.1 and were cultured on DPD medium containing 1.5 mg/L NAA,0.6 mg/L TDZ,BA,0.5 mg/L 2,4-D.The first ce

Abstract:采用组织培养和石蜡切片法，分析多种因素对防风畸形胚状体发生和发育过程的影响及控制。结果表明，诱导正常体细胞胚高频发生的培养基组合是：启动胚性愈伤组织的培养基是MS 0．5mg／L 2．4-D，蔗糖浓度3％；分化培养基是MS 1mg／L 6-BA 0．2mg／L NAA 0．5mg／L ABA，蔗糖浓度4％～5％；成熟培养基是MS培养基，蔗糖浓度3％。结论：一定浓度的生长素是诱导防风胚性愈伤组织的关键因素，细胞分裂素在体细胞胚的分化和发育过程中起协同作用；蔗糖浓度、ABA、接种方法以及适宜的培养条件和培养容器等均可有效降低畸形胚状体的发生率。

Abstract:Scutellaria baicalensis Georgi Cell were suspension-cultured in 4 mediums with different hormone formula.The results indicatd that it showed S-shaped growth curve and had 9 day growth period in different mediums.The activities of catalase and nitrate redu

Abstract:There were greatly different effects on Oncidium shoot propagation in vitro culture between two kinds of cytokinin:6-BA and Ad.The concentrations of 6-BA within 2.0~4.0 mg/L were suitable for Oncidium shoot propagation.The largest propagation coefficient

Abstract:对红木花色素的理化性质及微波提取方法进行了研究.结果表明红木红色素可能属醇溶性黄酮类,其耐酸、耐氧化性很好,耐光氧化和耐热处理性极佳,而耐碱性和耐Fe2+、Fe3+、Cu2+、Pb2+盐离子性较差.微波提取工艺研究表明微波提取时间在设定的提取工艺三因素中居主要影响,其次是乙醇用量和浓度;只需一次微波处理便可将花瓣中红色素提完.进一步研究该色素的光照和热处理降解特性,结果表明在设定的各处理温度下,该红色素降解均很缓慢,但其降解速度随设定处理温度升高呈加快趋势.在90℃～100℃的热处理下,其降解速度与热处理时间有A(最大光吸收)～t及lnA～t线性相关关系;当低于90℃时,仅80℃的设定热处理下有lnA～t直线相关,而A～t间都不呈线性关系.连续光照处理中,随处理时间延长其降解幅度极小,降解速度与光照时间不存在A～t及lnA～t线性相关.

Abstract:To assess the medicinal value of cultural Anisodus tanguticus,the contents of four bioactive tropane alkaloids,anisodine,anisodamine,scopolamine and atropine,in cultural and wild materials were determined by the HPLC method.The results showed that content

Abstract:The volatile oils of lotus leaves extracted with supercritical CO_2 and stream distillation were analyzed qualitatively and quantitatively by GC-MS.The result showed that the constituent contents of the volatile oils extracted with the two methods are dif

Abstract:In this study,the steam distillation was used to extract the volatile constituents from the bark of Pinus tabulaeformis Carr.growing in Lanzhou,Gansu Province.The chemical constituents of the volatile oil were identified with GC/MS method,and 42 constitue

Abstract:以玉米3138为材料，在大田和PVC管栽条件下研究了应用植物生长调节剂30％己乙水剂对玉米根系伤流量、伤流中无机离子流量、氨基酸组分及流量、激素流量等的影响，结果表明：30％己乙水剂可提高玉米根系伤流量，特别是大喇叭口期和籽粒形成期；提高了伤流中K，P，Ca，Mg，Si，Zn，Mn，Fe，B，Mo，Cu等无机元素流量，氨基酸总流量提高，主要的运输形式氨基酸Ser，Clu，Lys．Arg，Val，Ala，Leu，I1e，His，Try，Phe流量均明显增加，非蛋白质氨基酸GAba大幅度增加，伤流液中IAA在籽粒形成和灌浆期提高，授粉后伤流中Gas提高，CTKs在籽粒形成期提高，ABA在灌浆期提高，吐丝前低于对照。表明30％已乙水剂可促进根系吸收和合成物质向地上部分的输送，对促进地上部发育有重要作用。

Abstract:A new form of Lancea was described.

Abstract:Self-incompatibility (SI) prevents inbreeding and promotes outcrossing by enabling pistils to recognize and reject pollen from genetically related individuals.Recent data have provided clear insights into some aspects of self-recognition and rejection in

Abstract:Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is known for its pivotal role in glycolysis as a classical glycolytic protein in cytosolic energy production.It is used as a model for protein and enzyme analysis.It is also utilized as an internal control

Abstract:As modern cotton varieties including Bt (Bacillus thuringiensis) transgenic cotton are adopted and the yield per unit area continues to increase,potassium deficiency is occurring at a rising frequency in many cotton-growing countries.Symptoms of K deficie

Abstract:With the rapid development of molecular quantitative genetics,the QTL mapping of crop complex quantitative traits,especially economic traits,has made great progress in these years.This promotes the genetic improvement and molecular manipulation of those c

Abstract:

Abstract:构建了含有目的基因(LeIRT2)的双元载体pYF840，并成功地将植物性内含子构建到筛选标记基因新霉素磷酸转移酶基因(nptⅡ)和gus报告基因中。利用农杆菌介导法，将铁载体蛋白(LeIRT2)基因导入革新一号烟草，PCR、PCR-Southern blotting及Southern blottlng检测结果显示，有3个烟草株系的基因组中整合了完整的铁载体基因(LeIRT2)。水培试验结果显示转基因株系1、3不但提高了植株的铁吸收能力，而且还促进了植株的生长，但转基因株系2却与对照无明显区别。

Abstract:The study of the AFLP system optimization and cluster analysis for peach showed that (1) High quality of genome DNA,suitable template density for preamplification and selective amplification were important factors that affected results of AFLP.(2) Preampl

Abstract:The cDNA of resveratrol synthase gene was cloned according to over-hang extension PCR protocol with grape genomic DNA as template.Through sequence analysis showed that the cDNA of resveratrol synthase was correctly obtained.

Abstract:中间偃麦草含有丰富的优良基因，在小麦的遗传改良中具有重要利用价值。对从中间偃麦草与小麦品种烟农15杂种后代(BC2F4)中选育的小麦种质系山农0095进行形态学和细胞学鉴定，结果表明：山农0095株高78cm，穗长17．3cm，旗叶长36．3cm，旗叶宽3．03cm，茎杆粗壮，繁茂性好，既长又宽的旗叶、长圆锥型穗是其显著的形态学特征；其根尖细胞染色体数日为2n=42，花粉母细胞减数分裂中期Ⅰ(PMC M Ⅰ)染色体构型为2n=21Ⅱ；它与普通小麦的杂种FⅠPMC M Ⅰ绝大多数细胞出现2个单价体，没有观察到多价体，平均染色体构型为2n=20．08Ⅱ 1．84Ⅰ。以上结果表明，山农0095是一个小麦-中间偃麦草的双体异代换系。

Abstract:In this study,anatomic examinations were made on the leaf epidermis of subtrib.Chinese eragrostidinae,including Desmostachya,Dinebra,Eragrostis,Acrachne,Harpachne and Eragrostiella.With external morphology,systematic relationships among 6 genera were disc