氢分子医学分享 http://blog.sciencenet.cn/u/孙学军 对氢气生物学效应感兴趣者。可合作研究:sunxjk@hotmail.com 微信 hydrogen_thinker

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中国学者发现氢气对植物的效应

已有 8296 次阅读 2012-10-26 23:01 |个人分类:植物氢气效应|系统分类:科研笔记| 动物, 中国, 植物, style

高等植物产生氢气的早期研究.pdf



氢气对动物的效应已经研究比较多了,但对植物的效应研究比较罕见,来自南京农业大学的一篇报道,将可能掀起一股研究氢气在植物抗性研究的热潮,这一研究将发表在著名植物杂志Plant Cell Environ,目前已经可以在线阅读。这一发现具有非常重要的启示意义,说明氢气的作用范围不仅是动物、细菌、也包括植物。这不仅从另一个角度证明了氢气的生物学效应客观真实,而且意味着氢气的应用范围会扩展到农业和林业。

从生命进化角度考虑,植物的祖先藻类植物就是能合成氢气的低等生命,在比较复杂的高等植物是否也具有合成氢气的作用过去并不了解(过去曾有体外研究证据表明叶绿体具有产生氢气的能力),氢气是否在植物也可以产生类似在动物中的生物学效应也不清楚。Jin等开展的这一研究将给人们解答了氢气对植物也存在类似在动物的生物学效应。本研究首先发现植物在除草剂胁迫情况下(苜蓿)

Hydrogen gas acts as a novel bioactive molecule in enhancing plant tolerance to .pdf

植物产生氢气的能力大增,这应该是国际上证明高等植物产生氢气(过去曾有报道植物种子产生氢气)的报道,然后作者发现预先给植物用不同浓度的氢气处理,可以诱导植物产生抗氧化酶,可以减少氧化应激损伤和活性氧(过氧化氢和超氧阴离子)水平(这部分和在动物试验的结果类似),另外,抗氧化酶活性和基因转录水平都可以受到氢气的促进(血红素阳性对照),其中,血红素加氧酶HO-1)增加非常显著,使用HO-1的阻断剂可以将氢气的上述效应逆转,说明HO-1增加是氢气发挥抗氧化作用的重要原因(也就是说氢气是通过HO-1发挥抗氧化作用的,不是氢气自己的抗氧化作用,这非常关键)。使用一氧化碳也可以逆转氢气的效应,提示一氧化碳对氢气存在拮抗作用(氢气是否可影响一氧化碳的作用也值得探索?)。最后作者用干旱、低温和高盐等手段折磨植物(苜蓿),氢气可以帮助这些植物耐受上述恶劣环境因素,氢气难道是植物的天使?希望有更多研究来证实这一推断。

Plant Cell Environ. 2012 Oct 24. doi: 10.1111/pce.12029. [Epub ahead of print]

Hydrogen gas acts as a novel bioactive molecule in enhancing plant tolerance to paraquat-induced oxidative stress via the modulation of heme oxygenase-1 signaling system.

Jin Q, Zhu K, Cui W, Xie Y, Han B, Shen W.

College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China.

Hydrogen gas (H(2) ) was recently proposed as a novel antioxidant and signaling molecule in animals. However, the physiological roles of H(2) in plants are less clear. Here, we showed that exposure of alfalfa seedlings to paraquat stress increased endogenous H(2) production. When supplied with exogenous H(2 ) or the heme oxygenase-1 (HO-1) inducer hemin, alfalfa plants displayed enhanced tolerance to oxidative stress induced by paraquat. This was evidenced by alleviation of the inhibition of root growth, reduced lipid peroxidation and the decreased hydrogen peroxide and superoxide anion radical levels. The activities and transcripts of representative antioxidant enzymes were induced after exposure to either H(2 ) or hemin. Further results showed that H(2) pretreatment could dramatically increase levels of the MsHO-1 transcript, levels of the protein it encodes, and HO-1 activity. The above-mentioned H(2) -mediated responses were specific for HO-1, given that the potent HO-1 inhibitor counteracted the effects of H(2) . The effects of H(2) were reversed after the addition of an aqueous solution of 50% carbon monoxide (CO). We also discovered enhanced tolerance of multiple environmental stresses after plants were pretreated with H(2) . Together, these results suggested that H(2) might function as an important gaseous molecule that alleviates oxidative stress via HO-1 signaling. © 2012 Blackwell Publishing Ltd.

 



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