近日,，中科院華南植物園科學(xué)家研究發(fā)現(xiàn),，氫氣對植物激素效應(yīng)具有調(diào)節(jié)功能,。相關(guān)研究在線發(fā)表于《公共科學(xué)圖書館—綜合》上。
氫氣長期以來被認(rèn)為是沒有生理效應(yīng)的氣體分子,，其在高等植物中的作用很少得到研究,。盡管早在1947年就有人發(fā)現(xiàn)分離的葉綠體中有氫氣釋放，但在高等植物中是否存在氫化酶則一直沒有找到明確的證據(jù),。氫氣是否對高等植物具有生理效應(yīng)也鮮有深入的報道,。
華南植物園研究員張明永等發(fā)現(xiàn)，氫氣對綠豆和水稻的種子萌發(fā)具有重要影響,，同時對綠豆種子萌發(fā)的影響具有促進(jìn)或抑制作用,。他們發(fā)現(xiàn)氫氣對水稻的各類生長激素受體和各類抗氧化酶的基因表達(dá)具有顯著影響。
研究人員從基因進(jìn)化角度,，推測產(chǎn)生氫氣的蛋白可能來自水稻的氫化酶基因,，同時發(fā)現(xiàn)水稻產(chǎn)氫能力和之前推測的水稻氫化酶基因可以受到多種脅迫因素以及植物激素的誘導(dǎo)。并據(jù)此提出氫氣可能是一種重要的植物氣體信號分子,。（生物谷Bioon.com）
生物谷推薦的英文摘要
PLoS ONE doi:10.1371/journal.pone.0071038
Molecular Hydrogen Is Involved in Phytohormone Signaling and Stress Responses in Plants
Jiqing Zeng mail,， Mingyong Zhang mail， Xuejun Sun
Molecular hydrogen (H2) metabolism in bacteria and algae has been well studied from an industrial perspective because H2 is viewed as a potential future energy source. A number of clinical trials have recently reported that H2 is a therapeutic antioxidant and signaling molecule. Although H2 metabolism in higher plants was reported in some early studies,， its biological effects remain unclear. In this report,， the biological effects of H2 and its involvement in plant hormone signaling pathways and stress responses were determined. Antioxidant enzyme activity was found to be increased and the transcription of corresponding genes altered when the effects of H2 on the germination of mung bean seeds treated with phytohormones was investigated. In addition， upregulation of several phytohormone receptor genes and genes that encode a few key factors involved in plant signaling pathways was detected in rice seedlings treated with HW. The transcription of putative rice hydrogenase genes,， hydrogenase activity,， and endogenous H2 production were also determined. H2 production was found to be induced by abscisic acid， ethylene,， and jasmonate acid,， salt， and drought stress and was consistent with hydrogenase activity and the expression of putative hydrogenase genes in rice seedlings. Together,， these results suggest that H2 may have an effect on rice stress tolerance by modulating the output of hormone signaling pathways.
