Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/ijms23052854
Keywords
Brassica rapa; hydrogen sulfide; mercury; reactive oxygen species; selenium
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In plants exposed to combined stress of mercury and selenium, endogenous hydrogen sulfide was found to play a defensive role by decreasing reactive oxygen species levels, alleviating cell death, and promoting root growth. This study expands our understanding of the regulatory role of H2S in response to multiple stress conditions in plants.
Plants are always exposed to the environment, polluted by multiple trace elements. Hydrogen sulfide (H2S), an endogenous gaseous transmitter in plant cells, can help plant combat single elements with excess concentration. Until now, little has been known about the regulatory role of H2S in response to combined stress of multiple elements. Here we found that combined exposure of mercury (Hg) and selenium (Se) triggered endogenous H2S signal in the roots of Brasscia rapa. However, neither Hg nor Se alone worked on it. In roots upon Hg + Se exposure, the defensive role of endogenous H2S was associated to the decrease in reactive oxygen species (ROS) level, followed by alleviating cell death and recovering root growth. Such findings extend our knowledge of plant H2S in response to multiple stress conditions.
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