Abstract:NCS,isolated from the mucilage of narcissus bulb,showed the inhibitory effects on growth and the cell ultra-structure of excised radish cotyledonds.The results indicated that NCS markedly inhibited the increase of chlorophyll content and the fresh weight

Abstract:This paper studies megasporogenesis, microsporogenesis and the development of female and male gametophyte of Aneurolepidium chinense (Trin.) Kitag. by means of paraffin wax. The main results are as follows: (1) The wall of anther consists of four layers:

Abstract:Plants Thuidium cymbifolium were cultured in lead and cadmium single pollution for 7 days respectively, the ultrastructural variation of T.cymbifolium was observed by means of electron microscope .It was found that excess of lead and cadmium caused damage

Abstract:Morphologic features of the pollen and leaf epidermis of Amphicarpaea edgeworthii Benth.by SEM was reported in this paper. The pollen of the samples is subspheric or rectangular sphericlal, 3-colporate. The surface of the outer wall is scabrous. There is

Abstract:The result of root dying to 7 lawn plants indicates there are 5 kinds of haustoriums intra-cell.The most high infest rate of VAM to root tip is the meiosis zone,VAM can induce root primordium here, VAM also can infect the root cap.

Abstract:The niche characteristics of 13 of dominant species subalpine scrub and meadow community in Guandi Mountains are analyzed in this paper. First, the 33 quadrates are divided into five types of communities by TWINSPAN, which can be used as one-dimension res

Abstract:40 unknown strains of rhizobia isolated from Robinia pseudoacacia in Yangling, Shaanxi province and 34 reference strains were analyzed with 105 phenotypic features and numerically classified. The result showed that there was difference in the features of

Abstract:A variety of aquatic and soil samples were collected from Wuquanshan of Lanzhou in 2002, species diversity, community structure and distribution of algae were studied, and some suggestions on potential application of algae in local ecological re-construct

Abstract:The artificial communities of Haloxylon ammodendron which total area is about 0.035 million hm~2, is a dominant community in the sand building forestry in Minqin County, and occupies 51.5% of the total area of artificial forestry. With the exception of Ha

Abstract:冷驯化能大大提高植物的抗寒性。研究测定了引进日本桃叶珊瑚(Auccuba japonica Thunb.cv.Variegata)苗木在不同越冬条件下的抗寒性指标及在低温锻炼前后的半致死温度，并通过双向电泳分离与抗寒性有关的特异蛋白。结果表明，日本桃叶珊瑚能安全地越冬(最低气温为-18℃)，日本桃叶珊瑚叶片抗冻的细胞结构特征在于其叶肉细胞排列疏松，间隙大，有利于防止细胞内结冰；经过4℃冷驯化的植株低温半致死温度为-21℃，而未经冷驯化的植株低温半致死温度为-7．5℃；双向电泳分析发现至少有3个常温下存在而低温下消失的蛋白多肽，分子量分别为A15kD、B14kD、C56kD、D26kD。依据分子量和等电点初步分析，A与组蛋白H2A相似，B与组蛋白H2B相似；另B与Rubisco小亚基分子量相近，C与Rubisco大亚基分子量相近，前一种情况可能与有关抗寒基因的表达有关，后一种情况可能与低温下的光合作用减弱有关。

Abstract:The photosynthetic rate of Haloxylon ammodendron Bge. under the different soil moisture grades was researched. The results showed the water table, the soil moisture and the irrigated water quantum affect the photosynthetic rate of Haloxylon ammodendron ob

Abstract:对鄂尔多斯高原碱湖的鄂尔多斯螺旋藻Spirulinaerdosensis光合色素的吸收光谱、含量、光合速率和呼吸速率日变化进行了研究.结果表明:活体吸收光谱体现出了各色素在不同波段范围内的吸收差异;各种色素相对荧光强度有明显的差异.藻胆素的含量最高为97.86mg·g-1DW;类胡萝卜素的最低,为2.11mg·g-1DW;Chla为7.70mg·g-1DW.其光合速率的日变化呈单峰曲线,真、净光合速率均在13∶00达到最大,分别为36.24μmol·m-2·s-1和23.45μmol·m-2·s-1.

Abstract:Sampling survey method was carried out to analyze the soil environmental factors that influence the protein content of winter wheat, including soil organic matter, irrigation and fertilization in Qishan county, Shaanxi province. The result showed that all

Abstract:Effects of exogenous betaine on the photosynthesis in Lycium barbarum seedlings under salt stress were studied.The results showed that betaine could enhance chlorophyll fluorescence induction kinetics parameters Fo,Fm,Fv,Fv/Fm,Fm/Fo and Fv/Fo,increase chl

Abstract:Under the different osmotic stress with PEG 6000 and NaCl, the mature embryos of five wheat cultivars were used to study the influence of genotypes and hormone on callus induction and regeneration. The drought-tolerance of plants was related with the drou

Abstract:Based on the relationships among water potential productivity, water potential use efficiency and water supply condition, this presentation represents a new water supply function in the form of Weibull distribution. The function is of such sophisticated c

Abstract:在防雨池栽条件下,研究了干旱胁迫对小麦旗叶活性氧代谢的影响.结果表明,小麦旗叶内H2O2和O-·2水平随干旱胁迫的加剧和衰老进程的加快而逐渐升高,活性氧清除系统中的SOD和CAT活性逐渐下降,膜脂过氧化产物MDA含量升高,导致叶片内可溶性蛋白质和叶绿素含量下降,是干旱胁迫造成对籽粒产量贡献较大的旗叶伤害的主要原因之一,从而导致穗粒重下降.

Abstract:抗小麦全蚀病中间材料H8911(BC1F1)是通过小麦与华山新麦草杂种幼胚培养及杂种F1(ABDN2n=28)再与小麦回交后得到的。根尖细胞染色体数目49条，花粉母细胞减数分裂中期Ⅰ，染色体构型为20．85(19～21)Ⅱ 7．30(7～11)Ⅰ，21Ⅱ 7Ⅰ的细胞占86．67％。BC1F2和BC1F3体细胞染色体数目范围分别为45～53和44～52，49条染色体的植株类型分别占30．19％和27．50％，华山新麦草染色体丢失率分别为11．85％和13．14％；花粉母细胞减数分裂中期Ⅰ，染色体构型分别为20．62(18～22)Ⅱ 7．64(5～13)Ⅰ 0．04(0～1)Ⅲ和20．53(17～22)Ⅱ 7．79(5～15)Ⅰ 0．05(0～1)Ⅲ，21Ⅱ 7Ⅰ的细胞分别占77．24％和69．42％。随着自交世代的延续，21Ⅱ 7Ⅰ细胞的传递能力逐渐降低。利用H8911作供体，选育出小麦-华山新麦草抗全蚀病新种质13个，其中1个附加系表现近高度抗病性，6个附加系、3个代换系和3个易位系材料表现中度抗病性。

Abstract:To obtain genes relating to Ta1 gene and to study its' mechanism of male sterile ,DDRT-PCR was used to analyze genes' differential expression of near-isogenic-lines of Taigu genic male-steril wheat. 30 sets of arbitary primers were assessmented. 30 fragme

Abstract:对小麦品种试验小区各行实际产量与行的对应关系进行曲线拟合，获得评估小区边际效应的模拟曲线方程，根据方程对整个小区的边际效应进行评估。结果表明，小麦区域试验边际效应在实际产量中所占的份额为7．41%—27．08%，平均为14．95％，这远远大于审定一个新品种的要求(比对照产量增产5％)。所以边际效应的存在将直接影响各个材料产量的高低及名次的排列，影响到材料的审定及在生产上的利用价值。

Abstract:The H_2O_2 elimination of the crude extract of "Qinmei" kiwifruit seeds was tested and the result was positive. This indicated that there was something possessing reductive ability to prevent per-oxidization. A series of qualitative determinations were ca

Abstract:以短枝富士(spur-type Fuji)舞姿(Telamon)的F1群体(共106株)为试材，利用RAPD技术，结合集群分类分析法，进行了苹果柱型基因(Co)连锁的分子标记研究。获得了与Co基因连锁的RAPD标记S1085-437。该标记与Co位点的连锁距离为8．66cM。

Abstract:The contents of bioactive constituents and gutta in Eucommia ulmoides leaves in different species were determined and analyzed by way of variance analysis and multiple comparison. The results were as follows: each of the main constituents such as chloroge

Abstract:采用1年生三倍体毛白杨优质苗木单芽茎段，研究其组织培养技术和工厂化育苗技术。研究结果表明，组培苗增殖与生根同步进行，通用最佳培养基为：H NAA0．15mg/L，生根率80％～98％，年增殖次数8次，繁殖系数为5。蛭石粉 泥炭土(1：1)是三倍体毛白杨组培苗炼苗的最佳基质。通过组培苗生产、温棚炼苗和大田炼苗试验，研究出了包括接种培养阶段、移栽和苗圃管理阶段3个连续过程的三倍体毛白杨工厂化育苗的工艺流程。

Abstract:以虎杖茎段、叶柄、叶片为外植体探讨了愈伤组织诱导、分化和植株再生的条件,筛选出茎段生长培养基为1/2MS+BA1.0mg·L-1+KT0.5mg·L-1+NAA0.2mg·L-1,茎段、叶柄和叶片外植体愈伤组织诱导培养基为MS+BA1.0～2.0mg·L-1+KT0.2～0.5mg·L-1+NAA0.2～0.5mg·L-1或MS+BA2.0～3.0mg·L-1+KT0.2～0.5mg·L-1+2,4-D0.5mg·L-1;丛生芽诱导培养基为MS+BA2.0mg·L-1+KT0.5mg·L-1+IBA0.2mg·L-1+LH1000;不定根及根状茎诱导培养基为1/2MS+IBA0.2mg·L-1.

Abstract:研究了SNP对绿豆下胚轴插条生根的影响.结果表明,SNP促进下胚轴插条生根的最适浓度和最佳时间分别为300μmol*L-1和24 h,最适浓度SNP对6 d龄幼苗下胚轴插条生根促进效果最好,对下胚轴插条的生根促进效应显著大于其余插条.同时就SNP、IBA和NAA对不定根发生的影响进行了比较研究.

Abstract:分别在甘肃酒泉、陕西户县及临潼3地区蔬菜大田采集黄瓜、西葫芦、南瓜3种蔬菜上表现病毒病症状的毒原标样135个，采用鉴别寄主的生物学反应和双抗夹心ELISA法鉴定，结果表明引起上述地区黄瓜、西葫芦、南瓜3种蔬菜病毒病的毒原主要是黄瓜花叶病毒。3．95％“病毒必克”可湿性粉剂防治3种蔬菜病毒病的结果表明，300倍、500倍的病毒必克预防效果可达到75％～78％，且治疗效果明显，药效持久。因此，认为病毒必克是目前理想的植物病毒抑制剂。

Abstract:通过石蜡切片法制片，光学显微镜观察，研究了桂花叶的形态解剖结构。结果表明，桂花叶为典型的异面叶，表皮由1层排列紧密的形状不规则的表皮细胞构成，细胞外壁角质膜较厚，气孔只分布于下表皮。表皮上被有腺毛，腺毛及其周围排列整齐的表皮细胞形成环式结构。叶肉组织发达，栅栏组织由2～4层排列整齐的圆柱形细胞构成。叶肉中分布有少分枝或不分枝的石细胞，其细胞长轴与表皮垂直。叶脉结构较为复杂，主脉发达。上述特征与复杂多变的环境条件相适应。

Abstract:This thesis puts insight into the drought resistant structures of the kudzn leaves of three introduced varieties in the way of comparative anatomy,with such xeric-indexes as the thickness of palisade tissue,the diameter of the palisade tissue,the diameter

Abstract:The vacuoles of plant cells are multifunctional organelles.Research on isolation of mature vacuoles of higher plants has made substantial progress in the world.At present,several effective methods of isolation has been developed,such as osmotic lysis,poly

Abstract:Many phytopathogens can secrete oxalic acid which is the essential pathogenic determinant involved in disease development. There is close correlation between pathogenesis, virulence and oxalic acid secretion. Two enzymatic systems can catabolize oxalic ac

Abstract:In Arabidopsis,the MADS-box protein encoded by FLOWREING LOCUS C(FLC) is a repressor of flowering.Vernalization promotes flowering in some late-flowering ecotypes and many late-flowering mutants by decreasing the level of FLC transcript and protein in the

Abstract:The plants of the Gentianaceae are widely distributed in our country, and most plants are medicinal species.But up to now the chemical components of the most of its species and genus have not been studied systematically.This article summarized the present

Abstract:This paper summarizes the recent status of flavonoid compounds in pharmacological research. Expatiating bioactivity and pharmacological functions of flavonoid compounds, the thesis posts some structure-activity relationship of flavonoid compound concernin

Abstract:Based on current research on silicon of the beneficial chemicals in plants, this paper dissertated in detail the content, distribution, influential factors, physiological function and correlation to other elements of silicon in plants, and the absorption