Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology

S-BENZYL-L-CYSTEINE INHIBITS O-ACETYLSERINE(THIOL) LYASE AND REDUCES THE GROWTH AND PHOTOSYNTHESIS OF IPOMOEA GRANDIFOLIA

Published in 26/09/2022 - ISBN: 978-65-5941-830-5

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Paper Title
S-BENZYL-L-CYSTEINE INHIBITS O-ACETYLSERINE(THIOL) LYASE AND REDUCES THE GROWTH AND PHOTOSYNTHESIS OF IPOMOEA GRANDIFOLIA
Authors
  • Danielly Caroline Inacio Martarello
  • Marcela de Paiva Foletto-Felipe
  • Luiz Henryque Escher Grizza
  • Wanderley Dantas dos Santos
  • Rogerio Marchiosi
  • Osvaldo Ferrarese Filho
Modality
Abstract
Subject area
Plant Physiology
Publishing Date
26/09/2022
Country of Publishing
Brasil
Language of Publishing
Inglês
Paper Page
https://www.even3.com.br/anais/cbfv2022_registration/511831-s-benzyl-l-cysteine-inhibits-o-acetylserine(thiol)-lyase-and-reduces-the-growth-and-photosynthesis-of-ipomoea-gra
ISBN
978-65-5941-830-5
Keywords
cysteine, herbicide, sulfur assimilation, photosynthesis, weeds
Summary
Cysteine biosynthesis is positioned in a decisive phase of assimilatory sulfate reduction, marking the fixation of inorganic sulfide to a carbon skeleton. Cysteine is formed in plastids, mitochondria and the cytoplasmic matrix by the action of the cysteine synthetase complex [O-acetylserine(thiol) lyase (OAS-TL) plus serine acetyltransferase]. Because cysteine is a constituent of proteins and a precursor of essential compounds for plants, we hypothesized that the OAS-TL enzyme could be a new site of herbicide action. Using in silico tools, we identified S-benzyl-L-cysteine as an OAS-TL inhibitor and potentially an herbicide against the weed Ipomoea grandifolia. Here, we evaluated the effects of S-benzyl-L-cysteine on the growth and photosynthesis of I. grandifolia plants after 14 days of exposure. At 1 mM, S-benzyl-L-cysteine reduced the length and fresh and dry biomass of leaves, stems, and roots. It also reduced the net photosynthetic assimilation rate (PN) by 24%, stomatal conductance (gs) by 34%, quantum yield PSII (?PSII) by 19%, electron transport rate (ETR) by 19%, and photochemical extinction coefficient (qP) by 12%. In addition, it reduced the maximum rate of Rubisco carboxylation (Vcmax) by 23%, the electron transport rate (J) by 19%, and the triose phosphate utilization (TPU) by 20%. In brief, our data suggest that the reduction in the net photosynthetic rate is because of the reduction in electron transport caused by the compromise of complexes containing sulfur, ferredoxin and cytochrome b6f. Based on these findings, S-benzyl-L-cysteine emerges as a promising herbicide, but further studies on field conditions are imperative to confirm it.
Title of the Event
XVIII Brazilian Congress of Plant Physiology and I Ibero-latinoamerican Congress of Plant Biology
City of the Event
Porto Alegre
Title of the Proceedings of the event
Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology
Name of the Publisher
Even3
Means of Dissemination
Meio Digital

How to cite

MARTARELLO, Danielly Caroline Inacio et al.. S-BENZYL-L-CYSTEINE INHIBITS O-ACETYLSERINE(THIOL) LYASE AND REDUCES THE GROWTH AND PHOTOSYNTHESIS OF IPOMOEA GRANDIFOLIA.. In: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology. Anais...Porto Alegre(RS) CEPUCRS, 2022. Available in: https//www.even3.com.br/anais/cbfv2022_registration/511831-S-BENZYL-L-CYSTEINE-INHIBITS-O-ACETYLSERINE(THIOL)-LYASE-AND-REDUCES-THE-GROWTH-AND-PHOTOSYNTHESIS-OF-IPOMOEA-GRA. Access in: 25/03/2025

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