Abstract:Two Brassica oleracea var.botrytis varieties with different resistances to black rot were used to study physiological mechanism of Brassica oleracea var.botrytis seedlings to resist black rot.The results showed that Xanthomonas campestris pv.Campestris in

Abstract:Methods adopted in the researches of light physiology and ecology were adopted to study physiological changes in three Ilex species,Ilex chinensis,I. viridis and I. cornuta var. fortunei, under light-shaded conditions. The results showed that the net phot

Abstract:用便携式L I-6400光合测定仪,在晴朗的天气,对芦苇成熟叶片净光合速率(Pn)以及光合有效辐射(Par)、气孔导度(G s)、细胞间CO2浓度(C i)、叶温(T l)、叶周围气温(T a)和蒸腾速率(T r)等影响因子进行田间测定,研究芦苇的光合日变化。结果表明:芦苇净光合速率日变化呈双峰曲线,主峰出现在10:00,次峰出现在15:00,光合“午休”现象明显,且气孔限制是产生“午休”的主要原因。净光合速率日均为20.01μm o l.m-2.s-1,蒸腾速率日均为6.15 mm o l.m-2.-s 1,光补偿点为98μm o l.m-2.-s 1,光饱和点为2 125μm o l.m-2.-s 1(自然状态下达不到),表观光量子效率为0.060 4 m o l.m o-l 1,暗呼吸速率为2.91μm o l.m-2.-s 1,CO2补偿点为53μm o l.m o-l 1,饱和点为1 368μm o l.m o-l 1,羧化效率为0.064 7。数据显示,芦苇是一种高光效阳性植物,对于其资源的合理利用及其对湿地生态系统的稳定意义重大。

Abstract:Transferability of upland cotton EST-SSRs to upland cotton and sunflower were analyzed.1 500 pairs of upland EST-SSRs synthesized in the study were amplified in four varieties of upland cotton,their effective amplification percentage reaching 95% and thei

Abstract:Semi-quantitative RT-PCR was adopted to determine the effects of chitosan on the levels of GDHmRNA AND GSmRNA in the leaves of no-heading Chinese cabbage, and the results showed that GDHmRNA tended to vary basically in the same pattern as GDH activity did

Abstract:While the separating technique of wheat LMW-GS was improved,the modified one-step unidirectional continuous SDS-PAGE was adopted to analyze the types and compositions of LMW-GS in forty materials of wheat breeding with favorable quality and yield characte

Abstract:POD isoenzymes of A and B male sterile lines of Gossypium hirsutum capable of working as a maintainer were studied by isoenzyme determination in order to conveniently and fast identify sterile and fertile plants of A and B male sterile lines in the earlie

Abstract:Suppression subtractive hybridization was adopted to construct the SSH-cDNA library of the leaves of wheat germplasm with stripe rust resistance in their early inoculation with seedling leaves of the stripe rust-resistant germplasm N95175 that were inocul

Abstract:RAPD was employed to probe genetic differences and some controversial taxonomies of 30 plant groups belonging to 13 species and 1 variety of Glycyrrhiza L..14 primers with good polymorphism screened from 60 random primers were used to conduct RAPD analysi

Abstract:运用IEF×SDS-PAGE和NEPEGE×PAGE 2种双向电泳技术对5个普通小麦品种和1个硬粒小麦品种的高分子量麦谷蛋白亚基等电点的特性进行了研究。结果表明,等位亚基之间的等电点比较相近,而非等位亚基之间的等电点存在不同程度的差异,其中普通小麦G lu-B 1位点的亚基等电点最高,属于碱性类型。用NEPHGE×SDS-PAGE电泳能够对G lu-B 1亚基的等电点特性进行比较分析。通过对麦谷蛋白亚基等电点特性及变异规律进行分析,可以为精确判断亚基类型和鉴定遗传新种质等研究工作提供有价值的信息。

Abstract:Leaf anatomical examination was employed to study the genetic relations between Leymus and its related taxa according to the principle and methods of phenetics.Both Leymus and its six related taxa according to the principle and methods of phenetics.Both L

Abstract:对中国十字花科芸薹族6属9种植物进行叶片脉序的比较观察,结果表明:脉序可分为两大类型:Ⅰ.分枝曲行羽状脉,如芸薹属、芝麻菜属和两节荠属;Ⅱ.环结曲行羽状脉,如萝卜属、诸葛菜属和线果芥属。从脉序上看,芸薹属与两节荠属和芝麻菜属的亲缘关系比和萝卜属、诸葛菜属、线果芥属近。此外,芸薹属植物的脉序,依据二级间脉可将其分为两种亚类型:Ⅰ.简单型,如羽衣甘蓝;Ⅱ.复合型,如芸薹、青菜和芥菜,由此认为在芸薹属中羽衣甘蓝是比较原始的种类。

Abstract:Leaf-epidermis cells and stomatal apparatuses of Polygonatum cyrtonema at its different developmental stages were examined by light and scanning electron microscopy.The results showed(1) The cells in upper and lower leaf epidermises of P.cyrtonema grew in

Abstract:Sophora alopecuroides mainly distributes in the desert regions of Northwest China as a highly adversity-resistant perennial officinal plant.The anti-microbial activities of crude ethanol extract from aerial parts of Sophora alopecuroides and its petroleum

Abstract:Randomized blocks was adopted to study the effects of different stocking rates on the structures and functional group productivity of the communities in S.breviflora desert steppe in Inner Mongolia,and the results indicated that the number of community sp

Abstract:以四川小河沟自然保护区为研究对象,在遥感影像和DEM数据的基础上,对植被类型在地形上的分布差异进行研究。结果表明:(1)随着海拔高度的逐渐上升,各种植被类型依次出现和消失,呈顺序分布,并且每种植被类型在相应的海拔段上拥有优势地位。(2)植被类型的分布与坡向之间存在相关性,大面积的常绿落叶阔叶林和次生落叶阔叶林常常在西南坡向上出现,高山灌丛和高山草甸在南坡上的分布面积最大,而在平地、北坡和西北坡上则少有亚高山草甸分布。(3)随着坡度由缓变陡,各植被类型的面积比例在不同的坡度段内发生相应变化,但各坡度段上的植被类型均以次生落叶阔叶林和亚高山针叶林为主,除亚高山草甸外,其余植被类型均主要分布在坡度20~°50°的区域内。

Abstract:The spatial distribution patterns of major populations in the Achnatherum splendens communities inside and beyond fence limits were comparatively studied by taking typical A.splendens grassland in Sanjiaocheng breeding sheep farm of Qinghai Province as th

Abstract:An area typical of the crossed climatic zone of the loess plateau was chosen to study the niche widths and overlaps of major populations in arbor and shrub layers of six Pinus tabulaeformis communities still under tending with the tending duration as one

Abstract:在调查天华山自然保护区植物组成的基础上,对该区的蕨类植物区系进行了分析。天华山自然保护区共有蕨类植物24科48属111种(包括种下类群),其区系的基本特征是:①种类丰富,种系密度大;②优势科明显,大部分科内属、种贫乏;③地理成分多样,区系联系广泛;④温带性质显著,与热带蕨类植物区系有一定的亲缘关系;⑤南北过渡性明显;⑥区系具有一定古老性;⑦特有化程度高,有51个中国特有种,以西南、华中和华北成分为主,并有1个中国特有属。另外,在中国特有种中有9个陕西(秦岭)特有种。

Abstract:The area covered by Changbai Mountains has a temperate climate and is rich in officinal plants.Based on the field investigation and data or literature references over six years,an evaluation system for endangered and precious wild officinal plants,which c

Abstract:Neoathyrium crenulatoserrulatum(Makino) Ching et Z.R.Wang has long and recumbent rhizomes,rachises,costa and small pinnas covered with unicellular and multi-celluar hairs at their lower parts,oval or round exposed sori and perispore with folded enations,s

Abstract:以高丛蓝浆果(V accin ium corym bosum)叶片为外植体,研究了影响离体再生的多个因素,建立了高效的再生体系。结果表明:改良1/2 M S ZR 5 m g.L-1培养基最适合不定芽分化,再生率达100%。不同节位叶片对蓝浆果叶片不定芽的分化具显著效应,以幼嫩的1~2节位的叶片比较容易分化不定芽;叶片远轴面接触培养基、叶片创造伤口和不经暗处理或短时间处理有利于不定芽分化。低浓度IBA有利于叶片再生茎段的生根,在改良1/2 M S IBA 0.1 m g.L-1培养基上蓝丰(B luecrop)生根率为66.7%,而伯克利(B erk ly)仅为33.3%。

Abstract:采用离体的试验方法测定了菊苣根的石油醚、乙酸乙酯和乙醇提取物对7种植物病原真菌和3种细菌的抑制活性。采用盆栽试验方法测定了菊苣根提取物对小麦白粉病的防治效果。结果表明,乙醇和乙酸乙酯提取物均有一定的抑制植物病原真菌和细菌活性。且乙酸乙酯提取物效果更佳。在10 g.L-1浓度下,乙酸乙酯提取物能显著抑制小麦赤霉病菌、玉米大斑病菌和烟草赤星病菌3种病原真菌菌丝的生长,抑制率均在85%以上;对小麦根腐病菌、玉米大斑病菌和烟草赤星病菌的孢子萌发抑制率也均在80%以上;对枯草芽孢杆菌和金黄色葡萄球菌的抑菌圈直径达21.01 mm和17.23 mm;对盆栽小麦白粉病的预防和治疗作用分别为50.93%和65.82%。

Abstract:Chemical components of essential oil in Periploca sepium root bark were determined by gas chromatography-mass spectrometer and thus 15 compounds were isolated;then ten of the compounds were identified to be 4-methoxysalicylaldehyde,butyl acetate,2-methyl-

Abstract:Castanea DNA was extracted from the leaves of three Castanea species endemic to China,Castanea mollissima Bl.,C.seguinii Dode.and C.henryi Rehd.& Wils.considering that Canstanea plants are rich in secondary substances as polyphenols.The extraction method

Abstract:From the angle of cytological embryology,the paper theoretically studies pollen-tube pathway and transgenic mechanism of pollen-tube pathway transgenic technology,holding that the pathway for exogenous DNA to enter into embryo sacs is that exogenous DNA t

Abstract:Under salt stress,plant take up excessive Na~ so as make the ion equilibrium inside their bodies lose balance,and in order to maintain their growth,they need maintain this equilibrium;This process is performed by ion transporters on plasmlemma and vacuol

Abstract:Drought(water deficit) and high temperature are two major constraint factors in the growing season in the desert area of Northern China.The paper mainly summarizes research advances about the mechanisms for drought and high temperature to affect plant pho

Abstract:Alternative oxidase is the terminal oxidase in the cyanide-resistant respiration pathway in plant mitochondria,which widely existing in higher plants and parts of fungi and algae.As a di-iron carboxylate protein,Alternative oxidase possesses the structura

Abstract:在200 mm o l.L-1N aC l胁迫条件下,采用根部注射结合叶面喷施的方法,研究了不同浓度(0、50、100、150、200、250 m g.L-1)壳聚糖(Ch itosan,CTS)对黄瓜(Cucum is sa tivus L.)幼苗抗盐的生理作用。结果表明:CTS能够显著促进黄瓜幼苗的生长,降低植株盐害指数,最高幅度达36.2%(P<0.01);显著提高幼苗叶片游离脯氨酸(P ro)含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)等抗氧化酶活性(P<0.01);有效降低叶片细胞脂质过氧化产物丙二醛(M DA)含量和电解质渗透率(P<0.01);筛选出CTS最佳处理浓度为150 m g.L-1,持效期8 d以上。研究表明适宜浓度的CTS具有增强活性氧清除能力、保护生物膜功能、提高黄瓜幼苗抗盐的协同生理作用。

Abstract:用灵敏度较高的RT—PCR检测培养4周的大豆幼苗的5个不同组织：嫩叶、老叶、茎、离层和根，测得脱落纤维素酶基因的表达量互不相同，离层中表达量最高，茎中表达量最低。选取表达量最高的离层作为逆境处理材料，分别用高温（46C）、干旱、盐（200mmol／L NaCl）处理不同时间后，检测脱落纤维素酶基因的时间表达模式。结果表明：3种逆境条件下，脱落纤维素酶基因的时间表达模式各不相同，但总的来说，高温能抑制脱落纤维素酶基因的表达，干旱和盐都能促进脱落纤维素酶基因的表达。

Abstract:采用砂培试验研究了碱胁迫(0、12.5、25.0、37.5和50.0 mm o l.L-1N a2CO3)对2种菊芋(H elianthustuberosus L.)南芋8号(H t 1)和南芋1号(H t 2)幼苗生长及其光合作用和抗氧化作用的影响。结果表明,2种菊芋耐碱的极限浓度为50.0 mm o l.L-1;碱胁迫,尤其是高浓度(37.5 mm o l.L-1)的胁迫,显著降低菊芋幼苗总鲜重、净光合速率(Pn)、气孔导度(G s)、蒸腾速率(T r)、水分利用效率(WUE)及叶绿素总量(Ch l a Ch l b)、类胡萝卜素(C aro)含量与叶片和根POD活性,而显著提高细胞间隙CO2浓度(C i)、叶片和根SOD活性以及丙二醛(M DA)含量。此外,H t 1叶绿素a/b(Ch l a/Ch l b)在碱胁迫下没有明显变化,而H t 2却明显降低。这些结果表明非气孔限制是碱胁迫下2种菊芋幼苗Pn降低的主要原因。菊芋品种H t 1幼苗耐碱能力大于菊芋品种H t 2,这可能与H t 1碱胁迫下维持了较高的Pn、G s、T r、WUE、Ch l a/Ch l b、C aro含量、SOD和POD活性和较低的M DA含量有关。

Abstract:Two cucumber varieties with different salt resistances were hydroponically cultured to study the effects of NaCl at different concentrations on the growth and leaf photosynthetic characters of cucumber seedlings.The results indicated that under salt stres

Abstract:以1/4 Hoag land 0.5%N aC l为基础培养液,研究培养液中C aC l2浓度为0、15、20、25、30、35 mm o l/L时海滨锦葵种子萌发和幼苗生长状况。结果表明,随着培养液中C aC l2浓度的升高,种子萌发率逐渐增加。海滨锦葵幼苗根系活力、叶绿素含量、超氧化物歧化酶(SOD)和过氧化物酶(POD)活性在C aC l2浓度为15~25 mm o l/L时逐渐升高,丙二醛(M DA)含量下降,幼苗生长状况较好。但在C aC l2浓度为30~35 mm o l/L时,M DA含量逐渐升高,而以上其它各项生理指标呈逐渐下降的趋势。表明外源钙离子对N aC l胁迫下海滨锦葵种子的萌发和幼苗生长具有缓解效应,其中以25 mm o l/L C aC l2对N aC l胁迫的缓解效果最佳。

Abstract:One-year-or two-year-old trees of the nectarine varieties Zaohongbaoshi,Huyou 004,and Huyou 018 were used to study the effects of root restriction adopted in protected fruit-tree farming on the light-intercepting capability in the canopy,the soluble prote

Abstract:The nectarine variety Qinguang 2 was used to study the effects of cold shock treatment on the quality and related anti-oxidative enzyme activities of nectarine fruits during cold storage. The results illustrated that the 3.5 hour treatment with zero degee

Abstract:Hydroponics was employed to study the effects of different nutritional levels on root vigor and free amino acid composition and content of Astragalus membranaceus seedlings.The results indicated that nutrient deficiency significantly reduced the vigor of

Abstract:运用水培试验法研究不同营养水平对黄芪幼苗根系活力和游离氨基酸组成及含量的影响。结果表明：缺素显著降低黄芪根系活力，不同营养处理游离氨基酸含量差异显著，游离氨基酸总量的变化规律为叶片〉根，各处理游离氨基酸总量为-K〉-P〉NPK〉-N。全素处理与缺素处理相比．能提高根系活力、协调根冠比。黄芪幼苗通过提高体内游离氨基酸含量以增强对营养胁迫逆境的适应能力。