NMT是基因功能的活體檢測技術,已被103位諾貝爾獎得主所在單位,及北大、清華、中科院使用。
2011年12月02日,河北師範大學尚忠林、郝立華、王偉霞、陳忱利用NMT在Molecular Plant 上發表了標題為Extracellular ATP promotes stomatal opening of Arabidopsis thaliana through heterotrimeric G protein a subunit and reactive oxygen species的研究成果。
標題:Extracellular ATP promotes stomatal opening of Arabidopsis thaliana through heterotrimeric G protein a subunit and reactive oxygen species
In recent years, adenosine tri-phosphate (ATP) has been reported to exist in apoplasts of plant cells as a signal molecule. Extracellular ATP (eATP) plays important roles in plant growth, development, and stress tolerance.
Here, extracellular ATP was found to promote stomatal opening of Arabidopsis thaliana in light and darkness. ADP, GTP, and weakly hydrolyzable ATP analogs (ATPγS, Bz-ATP, and 2meATP) showed similar effects, whereas AMP and adenosine did not affect stomatal movement. Apyrase inhibited stomatal opening. ATP-promoted stomatal opening was blocked by an NADPH oxidase inhibitor (diphenylene iodonium) or deoxidizer (dithiothreitol), and was impaired in null mutant of NADPH oxidase (atrbohD/F).
Added ATP triggered ROS generation in guard cells via NADPH oxidase. ATP also induced Ca2+ influx and H+ efflux in guard cells. In atrbohD/F, ATP-induced ion flux was strongly suppressed. In null mutants of the heterotrimeric G protein α subunit, ATP-promoted stomatal opening, cytoplasmic ROS generation, Ca2+ influx, and H+ efflux were all suppressed.
These results indicated that eATP-promoted stomatal opening possibly involves the heterotrimeric G protein, ROS, cytosolic Ca2+, and plasma membrane H+-ATPase.
Figure 6ATP Stimulates Ca2+ Influx and H+Efflux in Guard Cells of Arabidopsis thaliana (Ecotype col-0).
(A) Gadolinium chloride (50 μM) blocked ATP-promoted stomatal opening.文章連結:
https://www.cell.com/molecular-plant/fulltext/S1674-2052(14)60201-X?_returnURL
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關鍵詞:非損傷微測技術,Ca2+流,H+流,擬南芥,保衛細胞,信號轉導