The hypothesis that lea protein played an important role under water or salt - stress conditions was further proved by the fact that increased tolerance was acquired by transgenetic plant when deping xu transformed the hva1 ( it belongs to group 3 lea ) gene to rice 徐德平把大麦的hva1基因( lea第三组)转入水稻中得到了很好的抗旱效果，这进一步证实了其抗脱水胁迫的功能。本论文从lea第三组基因入手，克隆了两个第三组lea基因。
High concentration of salinity disrupts the homeostasis in ion distribution and water potential , results in osmotic stress and further leads to the damage on various molecules , such as protein , nucleotide acid etc . it can arose growth arrest , and in some extreme conditions , even death of plants 盐分过高破坏了植物体内业已存在的均衡状态，引起细胞的渗透失衡，造成细胞失水，因而盐胁迫下，保持细胞水分均衡是植物对抗盐胁迫的重要策略之一。
There may have distinct difference on the scavenging of reactive oxygen species ( ros ) between euhalophyte and glycophyte . so cloning those genes that encode proteins engaged in scavenging ros from thellungiella salsuginea may attribute to get insight into the mechanism of plant salt tolerance 盐生植物和甜土植物在活性氧的解毒机制上可能存在显著的差异，因此从盐芥中克隆活性氧清除蛋白的基因并分析其功能，有助于理解植物中盐胁迫的耐受机制。
Although different researchers have different results , even some are contradictory , on the whole , all kinds of changes are adaptive reaction to water stress , which have advantage to improving wheat resistance of drought and have importance effect to yield formation under drought 虽然不同的研究者所获得的研究结果不同，有的甚至相互矛盾，但从总体上看，各种变化是对干旱胁迫的一种适应性反应，有利于提高小麦的抗早能力，对干旱条件下产量的形成具有重要作用。
The leaves of c . smyrnioides had been yellow in the end of april and the overground part of the plant had been blasted in the first of may . but at the same time , it just turned yellow for saturation treatment . and a . sylvestris and c . violaceum have similar tendency , that is , the plant in drought treatment blasted earlier than in saturation treatment 受到干旱胁迫的明党参植株在4月中旬叶片就已开始发黄， 5月中旬地上部分已枯萎，而此时饱和水分条件下植株的叶片刚开始变黄，川明参和峨参均与明党参相似，干旱条件下植株的枯萎时间均早于饱和条件下。
Some soil microbial activity parameters and heavy metals contents were analyzed by principal component method . the results showed that the critical levels of cadmium and lead in red clayed soil and red sandy soil were 15 mg . kg - 1 and 0 - 15 . mg . kg - 1 , 200 mg . kg - 1and 200 - 400 mg . kg - 1 , respectively . soil microbial populations and functional diversities of microbial community have changed to some extent under the stress of cadmium and lead pollution 在本文中我们将供试红壤的上述微生物活性指标和2种重金属含量进行主成分因子分析，其结果得出，红黄泥和红砂泥的土壤微生物活性镉胁迫的临界承载量分别为15mg ? kg ~ 1和0 15 ? mg ? kg ~ 1 ；铅胁迫的临界承载量分别为200mg ? kg ~ ( - 1 )和200 400mg ? kg ~ ( - 1 ) 。
Histochemical staining in tl transgenic tobaccos showed that sigp1 promoter was not only organ - specific ( especially expressed in leaves and guard cells ) , but also highly inducible by multi stress treatment such as drought , aba , high salinity and low temperature . quantitative analysis showed that gus activity in roots was very weak and no great changes were observed after treatment 通过对t1代转基因苗的组织化学定位表明，该启动子驱动的gus基因在逆境(如干旱、 aba 、高盐和冷)胁迫的叶片中表达，根中不表达，且老叶中的表达量高于幼叶中的表达量，说明其表达受发育阶段的调控。
