Rational Design, Synthesis and Evaluation of Indole Nitrogen Hybrids as Photosystem II Inhibitors.

Abstract:

:We report the synthesis of twelve indole derivatives bearing nitro or amide groups via Fischer indole methodology followed by reduction/acetylation and amidation reactions. After thorough characterization, these indoles were subjected to a number of studies in order to evaluate their bioactive potential as photosynthesis and plant growth inhibitors. Firstly, these molecular hybrids were evaluated as photosystem II (PSII) inhibitors through chlorophyll a (Chl a) fluorescence measurement. In this study, 6-chloro-8-nitro-2,3,4,9-tetrahydro-1H-carbazole (15a) and 5-chloro-2,3-dimethyl-7-nitro-1H-indole (15b) showed the best results by reducing the phenomenological parameters of reaction centers ABS/RC, TR0 /RC and ET0 /RC of PSII. Electron chain blockage by these compounds may lead to diminished ATP synthesis and CO2 fixation which interrupt the plant development. The compounds 15a and 15b both act as postemergent herbicides, reducing the dry biomass of Ipomoea grandifolia and Senna alata weeds by an average of 40% and 37%, respectively, corroborating the fluorescence results. Additionally, the molecular docking study revealed that the presence of strong electron-withdrawing groups at the indole phenyl ring is important for the ligand's interaction with the binding pocket of protein D1 on PSII. The optimization of these molecular features is the goal of our research group in further understanding and development of new potent herbicides.

journal_name

Photochem Photobiol

authors

de Souza JM,Fazolo BR,Lacerda JWF,Moura MS,Dos Santos ACR,de Vasconcelos LG,de Sousa Junior PT,Dall'Oglio EL,Ali A,Sampaio OM,Vieira LCC

doi

10.1111/php.13295

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

1233-1242

issue

6

eissn

0031-8655

issn

1751-1097

journal_volume

96

pub_type

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