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In nutrient solutions,deoxygenation caused a series of changes in root ana-tomy of some species,such as increased root diameter,root porosity and more developed aerenchyma,inducing a ROL barrier in root basal part and the consequent change of ROL profile.

溶液培养条件下,缺氧胁迫能使植物根的直径增粗,根孔隙度提高,通气组织更加发达,诱导根基部泌氧屏障的生成,使泌氧速率和泌氧方式发生变化。

F. bidentis leaf was of isobilateral type, and had thicker epidermis cell wall and cuticle, obvious cryptopores, and highly developed palisade tissue, with typical C4-plant Kranz anatomy. The collenchymas and vascular tissue in stem and the aerenchyma in root were well developed. Secretory structure was found in all vegetative organs. According to the analyses of soil physical and chemical properties and relevant ecological factors, F.

结果表明:黄顶菊叶片表皮具较厚的角质层、下陷气孔,叶片为等面叶、全栅型,叶肉细胞环绕维管束鞘细胞紧密排列,是典型C4植物的Kranz花环结构;茎中厚角组织和维管组织发达,根中还存在通气组织;根、茎、叶中均存在分泌结构。

During the process of long-time adaptive evolution, wetland plants adopted a series of special strategies to acclimate to salt stress. The main strategies are: 1 life history adjustment, e. g., to adjust seed germination time, implement seed dormancy and viviparity, and change reproductive manner to escape from direct salt stress, 2 morphological adjustment, e. g., to adjust biomass allocation pattern, age stem, defoliate, and carnify vegetative organs to isolate the redundant Na(superscript +) to the inactive-metabolism shoots or exclude the Na(superscript +)from tissues; 3 anatomic adjustment, e. g., to sink stoma, develop aerenchyma, and thicken cuticle and phellogen to maintain normal photosynthesis and respiration; 4 physiological and biochemical adjustment, e. g., to exclude and excrete salt, compartmentalize ions, adjust osmosis, do selective absorption, regulate hormones, and induce antioxidative enzymes to maintain the osmotic equilibrium and eliminate the active oxygen in cell; and 5 molecular level adjustment, e. g., to start up many salt-induced genes to regulate the metabolic responses to salt stress.

在长期的适应进化过程中,湿地植物形成了多种适应盐胁迫的策略,主要有:1生活史方面,植物可通过种子萌发时间的调整、种子体眠、胎生、繁殖方式的改变等逃避盐度的直接伤害;2形态学方面,植物可通过生物量分配模式的调整、茎的老化、落叶及营养器官的肉质化等将多余的Na隔离到代谢不活跃的茎中或将其排出体外;3解剖学方面,植物可通过气孔下陷、发达的通气组织、增加细胞木栓层、角质层及栅栏组织的厚度等以维持植物正常的光合作用和呼吸作用;4生理生化方面,植物可通过离子区隔化、拒盐、泌盐、选择性吸收、渗透调节、激素调节及抗氧化物酶的诱导等来维持细胞内正常的渗透压,清除胞内活性氧分子;5分子水平方面,植物可通过多种与盐胁迫相关的基因来调控细胞内的多种代谢反应。

The results showed that compared with soil culture, the root cap was not obvious with less amyloplast and polysaccharose substance under water culture. The root epidermis under water culture was thinner than that of soil culture, with little root hair or not, in which cortex parenchyma tissue developed with big cell, solution proliferative aerenchyma in intercellular space, and thin cell wall. However, the root cap under soil culture was big, with strong PAS reaction and no aerenchyma tissue.

结果表明:水培后根冠不明显,淀粉体较少,多糖类物质较少而土培根根冠体积较大,淀粉体较多,多糖类物质多,土培根PAS反应强烈;水培根表皮厚度比土培根小,水培根根毛少或退化消失;水培根皮层薄壁组织发达,细胞大型,壁薄,细胞间隙中含有溶生性通气组织,土培根皮层未见通气组织。

Affluence and education have also helped reduce population growth in most developed countries.

富裕的生活和教育也有助於减少人口增长的最发达的国家。

Branches or sub-branches are more likely to agglomerate in Shanghai while representative offices favor both Beijing and Shanghai.

外资银行的分行支行尤为聚集于珠三角、长三角和京津等经济发达地区,代表处则偏好聚集于北京和上海。

Under in the circumstances, with taking the economic theory of Marxism as the instruction, and based on a comprehensive analysis of the basic theory of the development of urban agricultural , the article made a thorough inquiry into the present situation and the problems in Shenzhen with the theories of the development economics, the agronomics, the quantitative economics and other disciplines of knowledge, it also focused on the strengths in the process of Shenzhen's development of urban agricultural.

基于此,本文以马克思主义经济理论为指导,运用发展经济学、农业经济学和数量经济学等学科知识,从梳理都市农业发展的基础理论着手,深入剖析深圳市都市农业的发展现状与问题,以及重点探讨深圳市都市农业发展的内外部优势,在总结国内外发达地区都市农业发展的经验基础上,研究深圳市都市农业发展战略,并。。。

In fact, Guangdonger's concept is modern indeed, the head of a county, alcalde has owns value, sometimes, livestock, especially the hoggery just became victim, because in areas that are underdeveloped is not have enough large industry enterprise.

广东人的观念确实比较新,县长、镇长都是有价的,有时,畜牧业尤其是规模猪场就成了牺牲品,因为在不发达地区没有大的工业企业。

According to introducing, this second investigation limits chose current network to shop relatively all-pervading economy relatively develop city.

据介绍,本次调查范围选择了当前网络购物较为普及的经济较发达城市。

As one of themost advanced countries either in terms of the technological or the educational level, America boastsits advanced online educational resources.

作为信息技术水平和教育水平都最为先进的国家之一,美国的教育资源非常发达

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However, as the name(read-only memory)implies, CD disks cannot be written onorchanged in any way.

然而,正如其名字所指出的那样,CD盘不能写,也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

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A single payment file can be uploaded from an ERP system to effect all pan-China RMB payments and overseas payments in all currencies.

付款指令文件可从您的 ERP 系统上传到我们的电子银行系统来只是国内及对海外各种币种付款。