胁迫的

Nitric oxide is a freely diffusible,gaseous compound and an important signal molecule in living organisms. In plants,NO influences aspects of growth and development,as well as the ability of plant responses to stress.

一氧化氮(nitric oxide，NO)作为植物体一种新的信号分子，参与植物许多生理代谢的调节和次生代谢产物合成调控，而且可以作为胁迫响应的关键信使。

As for Leucaena leucocephala seedlings, MDA is not the main product of lipid peroxidation and Tephrosia candida seedlings do not only rely on SOD and POD action to reduce active oxygen content. Through comprehensive analysis on water holding capacity of leaf, cytomembrane permeability, MDA content and SOD, POD activity, Dodonaea viscosa seedlings show the highest drought resistance, then Leucaena leucocephala, Tephrosia candida the last.

干旱胁迫对银合欢膜系统损伤生成的主要降解产物不是MDA；山毛豆清除活性氧毒害作用主要不是通过SOD和POD的作用；通过叶片相对保水力测定及膜透性、MDA相对含量、酶活性变化情况的分析，3个树种中坡柳耐旱性最强，其次为银合欢，山毛豆居后。

Fig.4 Comparison of distribution for RADR of root number, root length, seedling height and total r elative alkali damage rate at early seedling stage under different Na2CO3 concentration

图4 不同浓度的 Na2CO3胁迫下，水稻幼苗前期根数的相对碱害率和综合相对碱害率的分布比较

Four obvious up-regulated ESTs of SSADH were obtained in the drought stress Erianthus arundinaceus througth cDNA microarray hybridization.

通过消减文库技术结合cDNA芯片技术筛选的EST中含有4个推测为基因SSADH的EST，其在水分胁迫处理的斑茅中均明显上调表达。

Also, the influence of fungal endophytes and plant growth regulators on Festuca arundinacea is looked at. In addition, the biochemical identification of Festuca arundinacea varieties, as well as the use of transgenesis in genetic engineering, were looked at.

在研究和大量借鉴国内外最新研究成果的基础上，系统论述和报道了高羊茅在水分、温度、酸碱盐以及重金属等逆境胁迫下的生理变化，也包括内生真菌和植物生长调节剂对高羊茅的影响。

Two rice varieties, named Weiyou 402 and Eryou 416 were selected to grow in arsenic spiked soils (0, 10, 20 and 40 mg·kg-1 arsenic) and "natural" arsenic soils (1∶1 of geogenic high level arsenic soil from Guizhou province and silt loam soil from Beijing) in a greenhouse, to compare their arsenic uptake, accumulation, speciation and related health risks.

段桂兰 中国科学院生态环境研究中心，北京 100085以2个水稻品种威优402号和Ⅱ优416号为实验材料，采用温室栽培方法研究对比两个品种水稻在人工添加砷处理（0，10，20和40mg·kg-1）和模拟自然砷污染（贵州高砷土和北京褐土的混合土，质量比为1∶1）胁迫条件下的生长发育状况，分析砷在水稻不同部位的累积、形态转化及其健康风险。

Benzylaminopurine and abscisic acid were brushed onto the ears and upper leaves of Hordeum vulgore in pot experiments, to analyze the regulation of partial changes of hormone balance on distribution of Na(superscript +), K(superscript +) and free proline at a whole plant level.

用6-苄氨基嘌呤和脱落酸配合400mmol/L NaCl定位涂抹盆栽C3植物大麦的穗和上位叶片，分析了植物体激素水平的局部改变对叶片盐胁迫下整株水平上Na、K和游离脯氨酸分配的调节作用。

Gene fragments expressed differentially in Kandelia candel at two salt levels were identified by improved representational difference analysis of cDNA .

利用改进的代表性差异分析技术，从红树植物秋茄中分离了6个受盐胁迫诱导表达的基因片段和5个受盐抑制表达的基因片段。

Along with seawater stress strength upward, the ratio of root to shoot, Na+, Cl- and soluble sugar contents were increased significantly. Under the 10% and 20% seawater treatments, chlorophyll contents have no obvious difference compared with the control, but significantly decreased when the seawater stress further increased. Under the 10% seawater treatments, K+ contents in the shoot and root of Lactuca indica seedlings have no distinct difference compared with the control, but along with seawater stress strength upward, K+ content were markedly decreased by degrees. However, soluble protein content first increased then decreased with seawater concentration augment.

结果表明：苦荬菜幼苗地上部受海水胁迫较为显著，而根在30%海水以内与对照相比没有显著差异；根冠比随着海水比例的增加而提高；10%和20%海水处理下，叶绿素含量与对照相比差异不显著，但随着海水浓度的进一步增加，叶绿素含量显著下降；10%海水处理下，苦荬菜地上部分及根K+含量与对照差异不显著，高于10%海水处理，K+含量随海水比例的增加地上部和根部均逐渐显著降低；海水处理下，体内Na+和Cl-含量逐渐显著增加；地上部可溶性糖逐渐显著增加，而可溶性蛋白呈先升后降。

Lemna minor was more sensitive to cadmium than to copper. Some indexes of Lemna minor exposed to lead under menace conditions have no rules.

研究表明：青萍对镉污染反应最为敏感，对铜的反应相对缓和一些；青萍在铅的胁迫下表现出无序的状态。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。