Abstract:Using~(14) CO_2 labelled wheat of pot experiment at seven days pre-anthesis.The treatments in post-anthesis were control (A) and soil drying-wetting cycles of either 5(B) or 10 days (C).The result showed that about 19.0%~22.0% of~(14) C assimilates of pre

Abstract:对3种荒漠植物沙拐枣、梭梭和沙枣在干旱胁迫下的抗氧化能力进行了比较研究。结果表明，3种荒漠植物长期处于干旱生境下，都受到不同程度的膜脂过氧化，其中，沙枣的膜脂过氧化程度大于梭梭和沙拐枣。在1d的变化中，随着水势的下降，上午10：00前3种植物体内MDA含量都表现为上升趋势，此后梭梭和沙拐枣体内MDA含量表现为持续下降，到下午18：00达到最低，说明尽管水分胁迫在加强，它们却表现出极强的抗氧化胁迫能力；而沙枣体内MDA含量在下午18：00又开始上升，表明沙枣表现出一定的调节能力，但其能力有限，低于梭梭和沙拐枣。3种植物对干旱胁迫的应激方式不同；沙拐枣体内的SOD活性和ASA含量明显高于梭梭和沙枣，这与其体内相对较低的O2含量具有很好的一致性；对于植物体内H2O2的清除，抗氧化酶系统对沙拐枣体内的H2O2的清除起了一定的作用，但不是主要的，抗氧化剂GSH起主要作用，而梭梭体内南抗氧化酶系统中的CAT起主要作用，抗氧化剂起辅助作用；沙枣体内的AsA-POD起主要作用，其它的抗氧化酶和氧化剂起辅助作用。同时，植物体内还保持管各种酶的平衡。

Abstract:Under different phosphorus levels,wheats (Triticum aestivum L.,W1 means drought-resistance type Shaanhe No.6,W2 means water-sensitive type Zhengyin No.1) were selected as experiment materials,and pot experiments,in different irrigation contents (normal wa

Abstract:以胡杨披针形叶和宽卵形叶作为实验材料,对其组织水平的离子含量及不同类型细胞的离子分布特征、可溶性有机渗透调节物质的含量、液泡膜H+-ATPase的活性进行了测定。结果表明,Na+、Cl-、K+、Ca2+等离子的分布在两种叶片及不同细胞中有差异,主要表现为宽卵形叶中Na+、Cl-的含量分别为披针形叶的111.2%和118.4%,Na/K值和Na/Ca值分别为0.75和1.78,均高于披针形叶的。宽卵形叶的栅栏细胞的Na/K值和Na/Ca值较其维管束鞘细胞的高,而披针形叶的则正相反;宽卵形叶较披针形叶含有较高浓度的可溶性糖和脯氨酸,分别为514和0.751μmol·g-1FW,而甜菜碱的含量较低,为0.703μmol·g-1FW;宽卵形叶的液泡膜H+-ATPase的活性较披针形叶的高15.47%。以上结果表明胡杨宽卵形叶的渗透调节能力较强于披针形叶。本文还对两种叶片对胡杨适应其盐渍化生境的贡献进行了讨论。

Abstract:With potted tomato plants in green house as material,the effects of soil moisture on physiological characteristics,leaf water potential (LWP),cell sap concentration (CSC),stomatal conductance (Gs),stomatal limitation value (Ls),and the dynamic state of ph

Abstract:Effects of water stress on photosynthetic pigment and chlorophyll fluorescence induction kinetic parameter in leaves of Cynanchum komarovii were studied.The results showed the content of chlorophyll a (Chl a),b (Chl b) and carotenoid (Car) in leaves of Cy

Abstract:Phaseolus radiatus seeds were used as experimental materials,and changes of desiccation tolerance of pre-imbibed seeds and effect of Ca~(2+) treatment on seed desiccation tolerance were studied in this paper.Results indicated that desiccation tolerance of

Abstract:Jianshi' persimmon was stored in cold temperature with packaging in perforated polyethylene bags.Effects of this method on some changes or processes such as fruit texture,postharvest physio-biochemstry,weight loss,freshness loss and so on were studied.The

Abstract:采用沙培法,以玉米品种V1和V2为试验材料,定量分析缺钾对玉米生长和发育的影响.从胚芽鞘叶完全展开时,设置营养液中钾的浓度为3个梯度,分别为KH＝8 mmol·L-1;KM＝4 mmol·L-1;KO＝0 mmol·L-1.从胚芽鞘叶完全展开到吐丝期经常浇这3种营养液.用有效积温来计算玉米生长期间所需热量,把每日完好的叶面积作为玉米生长的衡量指标;每天记录每株玉米的叶片数,不管叶片的大小,作为衡量植株生长发育的方法.在每一个钾元素供应水平上,品种V1和V2的叶片数和自播种以来的受热时间呈直线相关.在KO水平上,V1和V2的发育速率分别是10%和15%,相对于KH水平来说是低的.在11片叶子期间,KO水平上的叶面积大约比KH水平上的低46%,KM水平上的叶面积大约比KH水平上的低25%;在玉米抽雄期,KO水平上的叶面积相对于KH来说减少37%,比KM水平上的少26%.这种差异从抽穗期开始一直保持到吐丝期.

Abstract:The adaptation to light of 8 evergreen-broad trees and control tree (Cinnamomum camphora) were analyzed by comparing their leaf structural characteristics.The results show that the adaptive manner to light in the evergreen-broad tree is very different for

Abstract:实验分析了有机土栽培下温室内CO2浓度变化规律,研究了增施CO2对温室番茄植株生理效应、产量、果实品质的影响.结果表明有机土栽培条件下温室内CO2浓度变化存在明显的季节变化和日变化.温室内CO2浓度在11月和3月,最高浓度达到1 200 μL·L-1以上,在改善温光条件下,可不施或少施CO2;而7月温室内CO2日最高浓度在500 μL·L-1以下,每天应提早增施CO2.CO2空间分布为近地面层》畦面》植株内部》冠层》株顶上部.不同的栽培方式下,有机土壤栽培CO2浓度日变化范围为331～1 294 μL·L-1,而外界浓度与土壤无作物栽培方式日变化范围为327～556 μL·L-1,土壤栽培CO2变化范围为402～1 047 μL·L-1.光照强度是影响温室内CO2浓度和利用效率的主要因素.与对照相比,温室内增施CO2番茄株高增加18.29%,总干重增加18.69%,功能叶面积增加22.02%,光合速率提高48.92%,叶绿素含量增加33.00%,羧化效率提高87.50%,产量增加 26.48%,果实Vc增加33.27%,番茄红素增加30.98%,差异均达到显著水平.

Abstract:The influences of bagging on the shelf lives and physio-biochemical changes in Cuiguan pears during the room temperature storage were studied.The results indicated that bagging treatments could increase fruit firmness,Vc content and SOD activity,inhibit t

Abstract:Observed and investigated the effects of different chilling days' treatment on morphology and changes of some physiology and biochemistry of tree peony flower buds in process of releasing dormancy outside greenhouse and culturing in greenhouse during forc

Abstract:The conservation and optimal utilization of meadow resources of the western alpine wetland what is one of the most important and focused scientific problems for the Proceeding of West China development.The western alpine wetland has been studied in Gannan

Abstract:When productivity is manipulated experimentally via fertilization,species diversity almost always decreases.The total competition hypothesis proposes that competition for all resources has increasing effects on diversity as productivity increases.The ligh

Abstract:Allelic variation of high-molecular-weight (HMW) glutenin subunits loci at Glu-1 was analyzed in 40 newly-bred bread wheat (Triticum aestivum L.) cultivars (or advanced lines),by using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) t

Abstract:从盐胁迫下的盐地碱蓬(Suaeda salsa)的cDNA文库中获得了一个延伸因子(SsEF-1α)的cDNA片段。以此片段为探针，对其在不同胁迫处理下的盐地碱蓬中表达利用Northern杂交进行分析，结果表明，不同盐浓度处理、同一盐浓度不同时间处理下及双氧水刺激条件下延伸因子在碱蓬叶中的表达量先呈现减少然后增加的趋势；聚乙二醇(PEG)及低温诱导下均呈现上升趋势。由此可见该基因在盐、氧化、高渗和低温胁迫条件下产生一定的反应。

Abstract:The immature embryo of beer barley cultivar Jinyin 6 was used as biolistics transferring acceptor.The plasmids with thioredoxin s gene (target gene) and bar gene (selective gene) were co-transformed into barley bombed by particle bombardment.Selecting,reg

Abstract:Thymosin gene is about 343 bp and cloned from animal."Meiwei cherry tomato" was transformed with thymosin gene by Agrobectorium mediation.Among 34 Kanamycin-resistant plants,4 were positive by PCR detection using thymosin gene primers.Nos terminating sequ

Abstract:This study was conducted to examine the interrelationship of 10 seed vigor traits in 12 wheat genotypes through variance,co-variance and path coefficient analysis,to determine broad-sense heritability,and to estimate genetic advance under selection.The ge

Abstract:以小麦品系山农215953(SN215953)为材料,采用水培的方法,于幼苗期(两叶一心)根灌15mmol·L-1甜菜碱,研究了外源甜菜碱对盐胁迫下小麦幼苗水分状况、脯氨酸和可溶性糖含量及抗氧化酶活性的影响。结果表明:(1)外源甜菜碱可缓解盐渍造成的小麦幼苗叶片的水分损失,改善小麦幼苗的水分状况,并发现甜菜碱的这种作用主要是通过促进脯氨酸和可溶性糖的积累进而提高小麦叶片的渗透调节能力来实现。(2)外源甜菜碱可以维持盐胁迫下小麦幼苗叶片的抗氧化酶(SOD、APX、POD)活性,缓解盐渍造成的盐胁迫伤害,对盐胁迫下小麦幼苗生物膜的稳定性和完整性起到保护作用。

Abstract:Elymus canadensis and Elymus sibiricus were two species which belong to different ecological area.186 loci were detected with 16 primers in the RAPD analysis,114 loci of which were polymorphic.The percentage of polymorphic loci was 61.29%.On the genetic p

Abstract:Based on the leaf epidermal characteristics,especially on the lower epidermis,the relationships among 6 genera (including an introduced genus) of Tridentinae from China were analysed in the present paper.The results show that the genus Orinus is the most

Abstract:51 unknown strains of rhizobia isolated from the genera of Lespedeza and Melilotus in part region of Shaanxi Province and 34 reference strains were classified numerically.The result showed that there was difference in the features of carbon and nitrogen s

Abstract:在观察了中国柽柳科(Tamaricaceae)4属27种植物花粉形态的基础上,对其进行了聚类分析。观察结果表明:该科植物花粉为三沟类型,无三拟孔沟类型,形态及外壁雕纹属间差异明显。花粉特征聚类分析结果表明,中国柽柳科植物花粉大致划分为明显的三组,所包含的种(某些种除外)分别隶属于柽柳科的4属:琵琶柴属(ReaumuriaLinn.)、水柏枝属(MyricariaDesv.)、山柽柳属(MyrtamaOvcz&Kinz.)和柽柳属(TamarixLinn.),而有争议的山柽柳属虽同柽柳属聚在一起,但也较早地分出成为独立的一支,结合种子形态及分子生物学证据,支持将秀丽山柽柳从水柏枝属中分出而另立新属,为传统分类学将该科划分为4属提供了依据。聚类分析进一步将水柏枝属植物花粉和柽柳属植物花粉分别分为2种类型,而琵琶柴属植物花粉类除个别种体积存在差异外,其纹饰类型较为单一,仅划分为1种类型。柽柳属植物花粉聚类分析结果与该属植物花盘类型的划分结果基本一致,融生花盘类型植物的花粉则在两组中均有出现,可能是间生花盘和假顶生花盘类型间的过渡类型。

Abstract:Three isozyme peroxidase (PER),estrase (EST) and acid phosphatase (ACP) were analyzed using polyacrylamide gel electrophoresis in 19 species of Calligonum.Variations of zymogram were significant among species.According to the quantitative data of the char

Abstract:This paper collects and sorts a series of Gansu endemic wood-plant species that add up 38 species,33 varieties and 6 formulae in 31 genera of 23 families.Its scientific name,characteristics,distribution,sources and habitat have been identified.So far the

Abstract:以南方型和北方型两个生态型黄瓜为材料，用改良的染色和制片方法，较为系统的研究了黄瓜花粉母细胞(PMC)减数分裂及其雄配子体的发育过程。结果表明：①黄瓜减数分裂属于同时型胞质分裂，双线期染色体具有明显的交叉节并呈现出较易识别的棒状或环状形态，在末期Ⅰ和末期Ⅱ有多核仁和核仁融合现象；②在四分体时期的小孢子成十字交叉形(decussate type)，而非四边形(isobilateral type)；③雄配子体发育过程中观察到两核居中期的特殊现象，在核居中期小孢子只有一层壁，而在核靠边期小孢子出现了两层壁；④黄瓜的成熟花粉粒属于两核花粉粒。

Abstract:The anatomical structure of floral nectary in development in Scheffler octophylla Harms.were investigated.The floral nectary is above inferior ovary and belongs to disc nectary.The nectary is composed of secretory epidermis and nectariferous tissue.The ca

Abstract:In this paper,Balbiania Sirodot and B.meiospora Skuja were described.They were reported for the first time to China.

Abstract:Plantlets were regenerated from the Rheum tanguticum Maxim.ex Regel.via tissue culture.The sterile shoots,cotyledons,hypocotyls,radicles and young roots of seed germinated seedlings of Rheum tanguticum Maxim.ex Regel.were used as explants cultured in vitr

Abstract:以5个基因型的黄瓜(Cucumis sativus L．)为试材，通过γ射线辐射花粉授粉并结合胚培养，从3个基因型中获得了单倍体植株。与正常二倍体植株相比，单倍体植株生长缓慢，花器异常。研究发现辐射剂量、亲本基因型、授粉组合对座果率和单倍体产率有一定影响。

Abstract:利用高效液相色谱法建立了青藏高原红景天的色谱指纹图谱。固定相采用C28反相色谱柱，流动相为甲醇：0．1%磷酸水(v／v=15：85)；检测波长220nm；流速为1．0mL／min。通过比较发现红景天样品的8个主要共有峰．可作为鉴别红景天药材的主要依据。方法简便快速。为中药品种的鉴定提供了较全面的信息。

Abstract:The growth regulators were applied by spraying panicles with 0.05 g/L 2,4-D aqueous solution during inflorescence development stage.Pollen fertility and ratio of seed setting showed no difference between treated and untreated plants in two-year study.Freq

Abstract:Plant gene engineering techniques has provided a new and efficient way for culturing of plants cultivar resistant to disease.The efficient regeneration of transgenic grapevine is crucial to grapevine genetic engineering,including organogenesis and somatic

Abstract:In order to ensure construction of vegetation,which especially protects soil from erosion,to attain the expected aim,the paper deals with selective application of techniques.It is considered that highlighting the naturalization requirement of general plan

Abstract:Research progress was discuss systemically on metabolism characteristics of inner betaine in plant and gene engineering of synthetical enzyme,relations between physiological function of inner betaine and drought resistance/salt resistance and physiologica