Light , as the unnecessary factor for tobacco cell suspension culture , have some effects on the stress induced - aba accumulation . under dark condition , stress induced - aba accumulation decreases by 50 percent 光对细胞响应渗透胁迫信号有一定的影响，黑暗条件下渗透胁迫诱导aba积累水平只有对照的50左右。
Water stress induce the high and quick accumulation of plant hormone abscisic aicd ( aba ) , which reduce the stomatal conductance of leaves , decrease the loss of water , and improve plant tolerance to water stress 渗透胁迫可以诱导植物积累脱落酸( aba ) ， aba的积累可以降低植株叶片气孔导度，减少水分的散失，从而增强植物对渗透胁迫的适应性。
In order to elucidate the mechanism how plant to perceive the water stress , suspension cultured system of tobacco cell was established in the experiment and the mechanism how tobacco cells perceive the mannitol tress was studied 为阐明植物对渗透胁迫的感受机制，本实验建立了烟草细胞悬浮培养体系，研究了悬浮培养的烟草细胞对甘露醇胁迫诱导积累aba及其感受机制。
Glutathione paritcally restores the salt - tolerant ability of 042bm - x2 , and we hypothesized that glutathione plays an important role in the cells of sinorhizobium meliloti 042bm by affecting its ability to regulate intracellular k + levels 从外源加入谷胱甘肽，能够部分恢复042bm - x2耐盐性，推测谷胱甘肽通过调节细胞内的钾离子浓度，在苜蓿中华根瘤菌042bm渗透胁迫反应中起重要作用。
The critical concentration of mannitol stress is 0 . 8 - 0 . 9mol - l - 1 . the maximal level of aba accumulation is attached after 5 hours " treat with 0 . 9mol - l - 1 mannitol solution . cell wall plays important roles in tobacco cells perception to osmotic stress 渗透胁迫诱导aba积累的水平与胁迫处理的浓度和时间相关，胁迫处理的有临界浓度为0 . 8 ? 0 . 9mol ? l ~ ( - 1 ) ， aba积累水平在胁迫处理5小时后达到最大。
High salt stress disrupts homeostasis in water potential and ion distribution . this disorder of homeostasis occurs at both the cellular and the whole plant levels . drastic changes in ion and water homeostasis lead to molecular damage , growth inhibition and even death 渗透胁迫、离子胁迫及其造成的一系列次级胁迫如氧化胁迫等，严重干扰植物体内业已存在的细胞及整株水平上的水分及离子稳态，造成植物细胞分子损伤，生长减缓甚至死亡。
( 1 ) wheatgrass could remove the active oxygen by heightening the activity of the enzymes and protect the plants from damage at light stress . ( 2 ) wheatgrass could keep turgor pressure by osmoregulation and flexibility of cells to maintain plants developing in drought stress , some osmregulatory substance , such as the proline and the soluble sugar , increased 2 、冰草植株在渗透胁迫条件下会增加渗透调节物质如脯氨酸、可溶性糖类以降低细胞渗透势，使其在高渗溶液中仍能够保持一定水分的吸收，植株能够维持生命活动。
According to the analysis of the function of candidate genes were classed and analyzed , the nthk1 may be involved in many signal transduction pathways , including cell growth and development , osmosis stresses , oxidation stresses , photo signal , synthesis of proteins and other unknown signal transduction pathways 对它们进行了分类分析，发现nthk1可能参与的信号传递途径，包括细胞生长发育、渗透胁迫、氧化逆境、光信号、蛋白质的合成及其它未知的信号传递途径。
6 . the effects of nacl and peg in wild tomato and nr mutant fruit discs on the expression of nuclear transcription factors genes , including le - eils , leerfs , was studied . with respect to wild tomato , le - erf2 expressed higher under salt and osmotic stress than under wound stress . and there was a significant difference in expression trends 伤、 nacl 、 peg处理普通型番茄和nr突变体番茄的果实圆片研究核内转录因子基因的表达变化，结果表明：在普通型番茄中， le - erf2的表达受到盐和渗透胁迫时，表达量高于伤胁迫，而且表达趋势也明显不同。
Secondly , this paper studied the effect of different concentration nacl on wheatgrass and pointed out that the wheatgrass could maintain well - balanced physiology at light salt stress , but at high salt stress , the membrane penetrability increased , fresh weight reduced , the development was restrained distinctly , and the osmoregulatory substance increased notably , at last the plants perished . from these results , this paper concluded that the wheatgrass had strong salt resistance 二、用不同浓度的nacl (氯化钠)溶液对冰草植株进行根际渗透胁迫发现，冰草在低盐浓度胁迫下能够保持正常的生理代谢，而高浓度盐胁迫下植株质膜透性增大，鲜重减少，生长明显受到抑制，有机渗透调节物质显著增加，长时间胁迫植株死亡。
