Journal article
Cadmium Disrupts the Balance between Hydrogen Peroxide and Superoxide Radical by Regulating Endogenous Hydrogen Sulfide in the Root Tip of Brassica rapa
Frontiers in plant science, Vol.8, pp.232-232
02/21/2017
Handle:
https://hdl.handle.net/2376/103901
PMCID: PMC5318417
PMID: 28270829
Abstract
Cd (cadmium) stress always alters the homeostasis of ROS (reactive oxygen species) including H
2
O
2
(hydrogen sulfide) and
O
2
•–
(superoxide radical), leading to the oxidative injury and growth inhibition in plants. In addition to triggering oxidative injury, ROS has been suggested as important regulators modulating root elongation. However, whether and how Cd stress induces the inhibition of root elongation by differentially regulating endogenous H
2
O
2
and
O
2
•–
, rather than by inducing oxidative injury, remains elusive. To address these gaps, histochemical, physiological, and biochemical approaches were applied to investigate the mechanism for Cd to fine-tune the balance between H
2
O
2
and
O
2
•–
in the root tip of
Brassica rapa
. Treatment with Cd at 4 and 16 μM significantly inhibited root elongation, while only 16 μM but not 4 μM of Cd induced oxidative injury and cell death in root tip. Fluorescent and pharmaceutical tests suggested that H
2
O
2
and
O
2
•–
played negative and positive roles, respectively, in the regulation of root elongation in the presence of Cd (4 μM) or not. Treatment with Cd at 4 μM led to the increase in H
2
O
2
and the decrease in
O
2
•–
in root tip, which may be attributed to the up-regulation of
Br_UPB1s
and the down-regulation of their predicted targets (four peroxidase genes). Cd at 4 μM resulted in the increase in endogenous H
2
S in root tip by inducing the up-regulation of
LCDs
and
DCDs
. Treatment with H
2
S biosynthesis inhibitor or H
2
S scavenger significantly blocked Cd (4 μM)-induced increase in endogenous H
2
S level, coinciding with the recovery of root elongation, the altered balance between H
2
O
2
and
O
2
•–
, and the expression of
Br_UPB1s
and two peroxidase genes. Taken together, it can be proposed that endogenous H
2
S mediated the phytotoxicity of Cd at low concentration by regulating
Br_UPB1s
-modulated balance between H
2
O
2
and
O
2
•–
in root tip. Such findings shed new light on the regulatory role of endogenous H
2
S in plant adaptions to Cd stress.
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Details
- Title
- Cadmium Disrupts the Balance between Hydrogen Peroxide and Superoxide Radical by Regulating Endogenous Hydrogen Sulfide in the Root Tip of Brassica rapa
- Creators
- Wenjing Lv - Institute of Food Quality and Safety, Jiangsu Academy of Agricultural SciencesLifei Yang - College of Horticulture, Nanjing Agricultural UniversityCunfa Xu - Central Laboratory, Jiangsu Academy of Agricultural ScienceZhiqi Shi - Institute of Food Quality and Safety, Jiangsu Academy of Agricultural SciencesJinsong Shao - Agricultural Products Quality and Safety Superivision, Inspection, and Testing Center, Ministry of AgricultureMing Xian - Department of Chemistry, Washington State University, PullmanJian Chen - Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences
- Publication Details
- Frontiers in plant science, Vol.8, pp.232-232
- Academic Unit
- Chemistry, Department of
- Publisher
- Frontiers Media S.A
- Identifiers
- 99900546757601842
- Language
- English
- Resource Type
- Journal article