Journal
PHOTOSYNTHETICA
Volume 58, Issue 2, Pages 358-368Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.32615/ps.2019.172
Keywords
bioherbicide; chlorophyll a fluorescence; leaf lesion; natural product
Categories
Funding
- National Key Research and Development Program [2017YFD0201300]
- Foreign Expert Project [G20190010118]
- Fundamental Research Funds for the Central Universities [KYZ201530]
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Alamethicin (AMT) is a linear antimicrobial peptide isolated from fungi Trichoderma viride. To date, the mode of action of AMT in plant cells remains unknown. Our experimental results indicate that AMT causes leaf lesion attributed to its multiple effects on PSII. AMT decreases the O-2 evolution rate of PSII. Based on chlorophyll fluorescence data, similar to the classical herbicide diuron, AMT interrupts PSII electron transfer beyond QA at the acceptor side, leading to the inactivation of the PSII reaction centers. Additionally, AMT decreases chlorophyll content and destroys the architecture of PSII pigment assemblies. However, AMT does not affect the oxygen-evolving complex at the donor side of PSII. Thus, it is concluded that AMT is a natural photosynthetic inhibitor with several action sites in PSII.
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