Real-time monitoring of oxidative burst from single plant protoplasts using microelectrochemical sensors modified by platinum nanoparticles.
Oxidative bursts from plants play significant roles in plant disease defense and signal transduction; however, it has not hitherto been investigated on individual living plant cells. In this article, we fabricated a novel sensitive electrochemical sensor based on electrochemical deposition of Pt nanoparticles on the surface of carbon fiber microdisk electrodes via a nanopores containing polymer matrix, Nafion. The numerous hydrophilic nanochannels in the Nafion clusters coated on the electrode surface served as the molecular template for the deposition and dispersion of Pt, which resulted in the uniform construction of small Pt nanoparticles. The novel sensor displayed a high sensitivity for detection of H(2)O(2) with a detection limit of 5.0 x 10(-9) M. With the use of this microelectrochemical sensor, the oxidative burst from individual living plant protoplasts have been real-time monitored for the first time. The results showed that oxidative burst from single protoplasts triggered by a pathogen analogue were characterized by quanta release with a large number of "transient oxidative microburst" events, and protoplasts from the transgenic plants biologically displayed better disease-resistance and showed a distinguished elevation and longer-lasting oxidative burst.
Ai
Feng
F
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
Chen
Hong
H
Zhang
Shu-Hui
SH
Liu
Sheng-Yi
SY
Wei
Fang
F
Dong
Xu-Yan
XY
Cheng
Jie-Ke
JK
Huang
Wei-Hua
WH
D018914:Cells, Immobilized / Q000166:cytology; D004563:Electrochemistry / Q000295:instrumentation*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D008839:Microelectrodes; D059828:Plant Cells; D010984:Platinum / Q000737:chemistry*; D011523:Protoplasts / Q000166:cytology* / Q000187:drug effects; D016897:Respiratory Burst / Q000187:drug effects; D013830:Thiadiazoles / Q000494:pharmacology; D013997:Time Factors
D013830:Thiadiazoles; C015700:benzo-1,2,3-thiadiazole; D010984:Platinum