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Beijingensis under three droughttreatments, normal, moderate and severe stresses. The results showed:(1) the canker disease ofboth cultivars was serious gradually with increased drought;(2) the bark tissue cells sufferedplasmolysis, more evident with the severity of drought stress;(3) under the drought andinoculation with B. dothidea, cells of two cultivars damaged at different degree, mailyrepresented in the changes of organelles, such as chloroplast swollen and distorted, number ofmitochondria increased and membrane system indistinct; then organelles suffered furtherdamagement with inoculation time, thinned mitochondrias stroma, decreased cristae, crumpledand partly broken membrane of chloroplasts with stroma exosmosis. At last, the chloroplastspartly disorganized;(4) the hyphae growed mainly intercellular in resistant cultivar and notonly intercellular but also intracellular in susceptible cultivar, which directly caused thenecrosis of cells;(5) under the severe drought, the damage of cells enhanced the infection ofpathogen and drought and pathogen stressed together and promoted the disease development;the damage from pathogen on cells was more serious than that from drought.

结果显示：(1)随着干旱胁迫程度的增加，2种杨树溃疡病害发生渐趋严重；(2)干旱胁迫下，杨树树皮组织细胞发生质壁分离，并随胁迫程度的增加而严重；(3)干旱胁迫下接种病原菌，2种杨树细胞发生不同程度的损伤，主要表现为细胞器发生较大变化，如出现叶绿体肿胀变形、线粒体数量增多，质膜模糊不清等现象；随接种时间的延长，细胞器受到进一步损伤，叶绿体被膜折皱，严重时局部破裂，基质外渗，并部分最终解体；(4)毛白杨中的菌丝主要在细胞间隙中穿行，而北京杨的菌丝除在细胞间隙中生长之外，侵入细胞内部也较多，直接导致细胞的解体；(5)干旱胁迫下细胞的损伤促进了病原菌的侵染，干旱和病原菌的双重胁迫加剧了病害的发生程度，并且病原菌侵染对细胞的破坏程度大于水分胁迫。

A 3 factorial pot experiment, with 2 phosphorus levels, 3 soil water contents and 4 winter wheat cultivars was designed to compare the P efficiency, P uptake efficiency and P use efficiency of different cultivars at Olsen P 3 2 mg·kg 1 of soil, and as influenced by soil water content.

选用在土壤磷水平为 5～ 7mg P.kg- 1土的条件下筛选出来的不同磷效率的 4个冬小麦品种，采用盆栽试验研究了有效磷为 3.2 m g P.kg- 1土时的磷效率、磷吸收效率、磷利用效率及土壤水分对这些指标的影响。

" Effects of Salt stress on Seed Germination and Seedling Growth of 4 Graminaceous Pasture Cultivars ие№ж‰,йе№,идёж·, Qin Guangquan , Chen Ping , Su Donghai зиие№4з§зжз§'牧и‰з§еие'е'е№и—з"йзе±е" Effects of Salt stress on Seed Germination and Seedling Growth of 4 Graminaceous Pasture Cultivars ие№ж‰,йе№,идёж·, Qin Guangquan , Chen Ping , Su Donghai

中国农科院金土地研究所牧草种子销售我公司是在中国农科院较早从事牧草种植与推广的单位，最近有些单位或个人借我单位的名义，向广大种植户销售劣质牧草种子，请用户主意。

In order to understand the relationship between dielectric properties and sugar content of juices, dielectric properties of juice of three honeydew melon cultivars and four watermelon cultivars with different maturities were measured with an open-ended coaxial-line probe and impedance analyzer over the frequency range from 10 MHz to 1.8GHz. Soluble solids content of fruit juice and moisture of fruit pulp were also measured. The correlation between dielectric properties and soluble solids content was analyzed.

为了解果汁的介电特性与其主要内部品质——糖度之间的关系，该文利用末端开路的同轴探头和阻抗分析仪测量了10 MHz～1.8 GHz的频率范围内不同成熟度的3个品种密瓜汁和4个品种西瓜汁的介电特性，同时测量了反映果汁糖度的可溶性固形物含量和果肉的含水率，分析了介电特性和糖度间的关系。

The results showed that protein content,wet gluten content and sedimentation value for the Tibetan cultivars were significantly lower than those for introductive cultivars.

受低纬度高海拔地势地形和特殊气候条件的影响，当地主栽品种的蛋白质等含量较低[4 ] ，其它品质性状参数也较低，生产出的小麦专用性不强。

Cluster analysis by unweighted pair-group method with arithmetic mean showed that both SSR and morphological markers could well distinguish the tomato cultivars by the colour of mesocarp and fruit size. The results of the evaluations of genetic diversity in tomato cultivars based on the two methods were similar.

用UPGMA进行聚类分析，SSR标记和形态标记都可依果肉颜色和果实大小将供试材料分组，即黄色和红色果肉，樱桃小番茄和大、中果形的混合型；两种方法对番茄栽培品种遗传多样性的评价相近。

Rice cultivars and 31 monogenic lines with blast resistance were challenged with 45 isolates of Magnaporthe grisea. All the cultivars belonged to wide spectrum of resistance.

本研究旨在通过对水稻品种的抗性筛选和抗性基因的分子标记研究，为培育具有稻瘟病持久抗性的水稻品种提供抗性亲本和用于辅助选择的分子标记。

The results showed that the 20 cultivars could be clustered into 4 groups based on their resistances to C.truncatum, among which ProINTA Patricia and Victoria SPI were the best, but Defi, Lobo, Salado, Xinjiang large-leaf and Travois were the weakest, while the other 13 cultivars had medium resistance to C.truncatum.

结果表明，不同品种抗苜蓿炭疽病能力的强弱不同，通过聚类分析将供试品种划分为4个类群，以ProINTA Patricia和Victoria SPI对苜蓿炭疽病的抗性最好，Defi德福、Lobo路宝、Salado萨兰多、新疆大叶苜蓿和Travois的抗病性最差，其他品种呈中等抗性。

Some Japanese pear cultivars had high affinities to Chinese sand pear cultivars.

中国白梨和中国砂梨交错聚合在一起，部分日本梨品种与中国砂梨有较高的相似系数。

The genetic relationship of 27 sapodilla cultivars and 4 mamey sapoae cultivars were analyzed by using fluorescent-labeled AFLP markers. A total of 1131 AFLP markers between 75 to 500 base pairs were generated with 9 primer combinations, of which 1096 (96.9%) were polymorphic.

利用荧光AFLP分子标记技术对27个人心果品种及4个蔓妹人心果品种资源的亲缘关系进行研究。9对引物共扩增得到1131条带(75~500 bp)，其中多态性带1096条(96.90%)。28个品种具特征性条带，特征带大小为350~500 bp。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷