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S -Benzyl-L-cysteine Inhibits Growth and Photosynthesis, and Triggers Oxidative Stress in Ipomoea grandifolia.
- Source :
- Agronomy; Aug2024, Vol. 14 Issue 8, p1633, 15p
- Publication Year :
- 2024
-
Abstract
- L-cysteine, a precursor of essential components for plant growth, is synthesized by the cysteine synthase complex, which includes O-acetylserine(thiol) lyase (OAS-TL) and serine acetyltransferase. In this work, we investigated how S-benzyl-L-cysteine (SBC), an OAS-TL inhibitor, affects the growth, photosynthesis, and oxidative stress of Ipomoea grandifolia plants. SBC impaired gas exchange and chlorophyll a fluorescence, indicating damage that compromised photosynthesis and reduced plant growth. Critical parameters such as the electron transport rate (J), triose phosphate utilization (TPU), light-saturation point (LSP), maximum carboxylation rate of Rubisco (V<subscript>cmax</subscript>), and light-saturated net photosynthetic rate (P<subscript>Nmax</subscript>) decreased by 19%, 20%, 22%, 23%, and 24%, respectively. The photochemical quenching coefficient (q<subscript>P</subscript>), quantum yield of photosystem II photochemistry (ϕ<subscript>PSII</subscript>), electron transport rate through PSII (ETR), and stomatal conductance (g<subscript>s</subscript>) decreased by 12%, 19%, 19%, and 34%, respectively. Additionally, SBC decreased the maximum fluorescence yield (F<subscript>m</subscript>), variable fluorescence (F<subscript>v</subscript>), and chlorophyll (SPAD index) by 14%, 15%, and 15%, respectively, indicating possible damage to the photosynthetic apparatus. SBC triggered root oxidative stress by increasing malondialdehyde, reactive oxygen species, and conjugated dienes by 30%, 55%, and 61%, respectively. We hypothesize that dysfunctions in sulfur-containing components of the photosynthetic electron transport chain, such as the cytochrome b<subscript>6</subscript>f complex, ferredoxin, and the iron–sulfur (Fe-S) centers are the cause of these effects, which ultimately reduce the efficiency of electron transport and hinder photosynthesis in I. grandifolia plants. In short, our findings suggest that targeting OAS-TL with inhibitors like SBC could be a promising strategy for the development of novel herbicides. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734395
- Volume :
- 14
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Agronomy
- Publication Type :
- Academic Journal
- Accession number :
- 179377098
- Full Text :
- https://doi.org/10.3390/agronomy14081633