...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >He-Ne laser preillumination improves the resistance of tall fescue (Festuca arundinacea Schreb.) seedlings to high saline conditions
【24h】

He-Ne laser preillumination improves the resistance of tall fescue (Festuca arundinacea Schreb.) seedlings to high saline conditions

机译：He-Ne激光预照明可提高高羊茅（Festuca arundinacea Schreb。）幼苗对高盐条件的抵抗力

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, we explored the protective effect and physiochemical mechanism of He-Ne laser preillumination in enhancement of tall fescue seedlings tolerance to high salt stress. The results showed that salt stress greatly reduced plant growth, plant height, biomass, leaf development, ascorbate acid (AsA) and glutathione (GSH) concentration, the enzymatic activities, and gene expression levels of antioxidant enzymes such as catalase (CAT) and glutathione reductase (GR) and enhanced hydrogen peroxide (H2O2) content, superoxide radical (O-2 (center dot-)) generation rates, membrane lipid peroxidation, relative electrolyte leakage, the enzymatic activities, and gene expression levels of superoxide dismutase (SOD), ascorbate peroxidase (APX), and peroxidase (POD), compared with controls. However, He-Ne laser preillumination significantly reversed plant growth retardation, biomass loss, and leaves development decay induced by salt stress. And the values of the physiochemical parameters observed in salt-stressed plants were partially reverted or further increased by He-Ne laser. Salt stress had no obvious effect on the transcriptional activity of phytochromeB, whereas He-Ne laser markedly enhanced its transcriptional level. Preillumination with white fluorescent lamps (W), red light (RL) of the same wavelength, or RL, then far-red light (FRL) had not alleviated the inhibitory effect of salt stress on plant growth and antioxidant enzymes activities, suggesting that the effect of He-Ne laser on improved salt tolerance was most likely attributed to the induction of phytochromeB transcription activities by the laser preillumination, but not RL, FRL or other light sources. In addition, we also utilized sodium nitroprusside (SNP) as NO donor to pre-treat tall fescue seedlings at the same conditions, and further evaluated the differences of physiological effects between He-Ne laser and NO in increasing salt resistance of tall fescue. Taken together, our data illustrated that He-Ne laser preillumination contributed to conferring an increased tolerance to salt stress in tall fescue seedlings due to alleviating oxidative damage through scavenging free radicals and inducing transcriptional activities of some genes involved in plant antioxidant system, and the induction of phytochromeB transcriptional level by He-Ne laser was probably correlated with these processes. Moreover, this positive physiochemical effect seemed more effective with He-Ne laser than NO molecule.
机译：本文探讨了氦氖激光预照对增强高羊茅幼苗对高盐胁迫的耐受性的保护作用及其理化机理。结果表明，盐胁迫极大地降低了植物的生长，植物高度，生物量，叶片发育，抗坏血酸（AsA）和谷胱甘肽（GSH）的浓度，酶活性以及过氧化氢酶（CAT）和谷胱甘肽等抗氧化酶的基因表达水平。还原酶（GR）和增强的过氧化氢（H2O2）含量，超氧自由基（O-2（中心点））生成速率，膜脂质过氧化，相对电解质泄漏，酶活性和超氧化物歧化酶（SOD）的基因表达水平，抗坏血酸过氧化物酶（APX）和过氧化物酶（POD）与对照组相比。但是，He-Ne激光预照明显着逆转了植物的生长发育迟缓，生物量流失和盐胁迫引起的叶片发育衰退。 He-Ne激光可部分恢复或进一步提高盐胁迫植物中观察到的理化参数值。盐胁迫对植物色素B的转录活性没有明显影响，而氦氖激光显着提高了其转录水平。用白色荧光灯（W），相同波长的红光（RL）或RL进行预照明，然后用远红光（FRL）进行预照明，并不能减轻盐胁迫对植物生长和抗氧化酶活性的抑制作用。 He-Ne激光对提高的耐盐性的影响很可能归因于激光预照射对植物色素B转录活性的诱导，而不是RL，FRL或其他光源。此外，我们还利用硝普钠（SNP）作为NO供体在相同条件下预处理高羊茅幼苗，并进一步评估了He-Ne激光和NO在增加高羊茅抗盐性方面的生理效应差异。综上所述，我们的数据表明，氦氖激光预照明有助于通过清除自由基和诱导某些参与植物抗氧化系统的基因的转录活性来减轻氧化损伤，从而增强高羊茅幼苗对盐胁迫的耐受性，并诱导He-Ne激光对植物色素B转录水平的影响可能与这些过程有关。而且，He-Ne激光的这种积极的理化作用似乎比NO分子更有效。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号